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1
Kahn, Steven Phillip. "Experimental verification and development of structural identification techniques on a grid." Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-03122009-040526/.
Full text
2
Pradyumna, M. "Influence Of Joint Compliance On The Behaviour Of Space Structures." Thesis, Indian Institute of Science, 2000. https://etd.iisc.ac.in/handle/2005/258.
Full textAbstract:
Space structures are inevitable while covering large spans. Space structures are skeletal structures, which are lighter for the same stiffness when compared with RCC roofs. Till now, space structures, like any other metal structures have been designed assuming the joints as rigid, although there have been several publications about semi rigid joints. Of course, the publications mostly deal with 2D structures and there are very few reports on 3D structures. Space structures, by their nature fall into the latter category.
The joints in a space structure are popularly called as "nodes". Generally, nodes, which ensure concentricity of member axes, are either solid or hollow. These are either cast or forged. There are other proprietary types, which do not come under the above classification, and have not been considered in this thesis. Hollow nodes are obviously more economical than solid nodes, but also more flexible. While it is prudent to prefer hollow nodes, it is equally necessary to assess their flexibility, because of its influence on the behaviour of the structure.
The hollow spherical node is very popular because of its simplicity and adaptability to various forms of space frames. Double layer grids, which are the most popular forms for roofing applications, are being increasingly implemented. While the hollow spherical node is well suited for double layer grids, an evolutionary development has been what is called as the hollow octahedral node (this node is simply referred to as the 'Octa ' node in this thesis).
Chapter 1 introduces space frames and double layer grids in particular, with the advantages of using double-layer grids. Jointing systems available around the world are briefed and the node connector used in the present study is introduced with a brief write-up on its advantages and disadvantages. This chapter also explores the available literature and, the scope and objectives of the thesis are mentioned.
Chapter 2 introduces 3D finite element models of the hollow spherical and octahedral nodes. The stiffness matrixes of these nodes have been derived by conducting analyses on the computer for six sizes each of the Octa and spherical nodes. Using the stiffness matrix of the node, a new method of incorporating this into the regular analysis of a space truss has been developed. The new method proposed yields realistic values for the forces in the members and takes into account the elastic deflections in the node under the action of member forces. Implementation of the proposed method has been carried out by writing a custom program using state-of-the-art object oriented programming techniques. A sample problem has been analyzed using this program to demonstrate the effect of including joint flexibility. The effect of flexibility of nodes on the effective length of compression members in double-layer grids has been evaluated. The effect of compliance on the dynamic characteristics of a space frame has also been evaluated for the sample space frame with flexible joints. The analysis program has been modified to evaluate the natural frequencies of the system using rigid or flexible nodes.
The study of the Octanode and spherical node under the action of uniaxial compression
and tension dominates the contents of Chapter 3. The two types of nodes have been
analyzed using commercially available finite element software considering material
nonlinearity. The stress patterns from the analyses have been examined thoroughly.
Two consistent methods for fixing the load at yield in both uniaxial compression and
tension have been proposed using the load-displacement curve. Yield loads for all the
nodes have been evaluated using both the methods and the results agree well between the
two methods. Three material yield values have been selected for each of the node size
for evaluating the yield values viz. 240,320 and 415 MPa. The members of a double layer
grid are connected to the nodes by bolts and holes are drilled in the nodes for this
purpose. The bolthole patterns differ between two popular types of double-layer grids.
Both these bolthole patterns have been modeled separately in the above exercise and the
results for these two have been shown to be approximately the same. The effect of
varying diameters of the boltholes on the response of the nodes has been examined.
Relationships between the yield load, diameter, thickness and material yield have been
developed using the method of least squares. The differences in the behaviour of the nodes under uniaxial compression and tension have been discussed. Ramberg Osgood type of relationships have been worked out for all the load-displacement curves obtained from the analyses. The simulation of non-linear behaviour of nodes with cracks with plastic crack closing forces have been carried out with useful insights into the behaviour of the two types of nodes in uniaxial compression and tension.
Chapter 4 is devoted largely for studying the two types of nodes under the influence of biaxial load combinations. The combinations studied are dual compression, dual tension and compression-tension. In all cases equal loads are applied along two orthogonal; directions in the horizontal plane. Stress patterns have been examined for each type of load combination and yield values for each case have been obtained using one of the methods proposed in chapter 3. These have been compared with the corresponding uniaxial values in both compression and tension. Some useful inferences have been possible by studying the behaviour of the nodes under the various biaxial load combinations. In each case, relationships between the biaxial yield load, uniaxial yield load, diameter of node, thickness of node and material yield of node have been obtained using the method of least squares. The nodes have been analyzed under some selected Multi-axial loading and combinations of load which cause yield based on the second method proposed in Chapter 3 have been obtained and tabulated. However, a proper and thorough study of the nodes under multi-axial loading proved to be beyond the scope of this thesis.
Chapter 5 contains the contributions made towards developing new methods and algorithms for obtaining the several results of chapters 2, 3 and 4, using object oriented programming (OOP) techniques. The contributions have been in Object Pascal, the underlying language of Delphi, a popular RAD tool developed by Borland/Inprise of USA. Several new modules have been developed to reliably handle the large amounts of data generated by the hundreds of analyses detailed in chapters 2,3 and 4. The ease with which new methods were possible to be incorporated into existing software using OOP has been demonstrated, with source code examples. Comparisons with other types of tools available and die advantages of using OOP have also been demonstrated using the experience during the preparation of this thesis. A strong case for OOP as an indispensable tool for the researcher has been made.
Chapter 6: Several important conclusions and suggestions for future work have been made.
Appendix 1 contains a brief note on the Method of Least Squares.
Appendix 2 contains a small write-up on Delphi and OOP. Concepts of OOP have been briefly described and comparisons between three popular OOP languages have been attempted. A brief description of the features in Delphi's Object Pascal has also been provided.
Appendix 3 contains the listing of Unit Arrays, which is a general purpose unit developed to make handling of large arrays easy. Several matrix calculations have been implemented which make the unit extremely useful for programmers.
Appendix 4 contains the full listing of program FormK, which has been developed for chapter 2 to derive the fall stiffness matrix of a space frame node. The program picks up results from several analyses, forms a few columns of the stiffness matrix and then fills up the rest using the cyclic symmetry present in the space frame node. This program is given in full, with the intention that other researchers may find it useful to use it as-is or use after making small alterations to suit their circumstances. OOP is known for fast, reliable and easy ways of implementing modifications to existing code.
Appendix 5 provides the full listing of the Object Pascal program for extracting Eigenvalues of a space truss with rigid joints or flexible joints. The incorporation of flexibility of the joints proposed in chapter 2 has been implemented. Descriptions of the program's implementations have been provided in chapter 5.
Bibliography contains the alphabetical list of references.
3
Pradyumna, M. "Influence Of Joint Compliance On The Behaviour Of Space Structures." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/258.
Full textAbstract:
Space structures are inevitable while covering large spans. Space structures are skeletal structures, which are lighter for the same stiffness when compared with RCC roofs. Till now, space structures, like any other metal structures have been designed assuming the joints as rigid, although there have been several publications about semi rigid joints. Of course, the publications mostly deal with 2D structures and there are very few reports on 3D structures. Space structures, by their nature fall into the latter category.
The joints in a space structure are popularly called as "nodes". Generally, nodes, which ensure concentricity of member axes, are either solid or hollow. These are either cast or forged. There are other proprietary types, which do not come under the above classification, and have not been considered in this thesis. Hollow nodes are obviously more economical than solid nodes, but also more flexible. While it is prudent to prefer hollow nodes, it is equally necessary to assess their flexibility, because of its influence on the behaviour of the structure.
The hollow spherical node is very popular because of its simplicity and adaptability to various forms of space frames. Double layer grids, which are the most popular forms for roofing applications, are being increasingly implemented. While the hollow spherical node is well suited for double layer grids, an evolutionary development has been what is called as the hollow octahedral node (this node is simply referred to as the 'Octa ' node in this thesis).
Chapter 1 introduces space frames and double layer grids in particular, with the advantages of using double-layer grids. Jointing systems available around the world are briefed and the node connector used in the present study is introduced with a brief write-up on its advantages and disadvantages. This chapter also explores the available literature and, the scope and objectives of the thesis are mentioned.
Chapter 2 introduces 3D finite element models of the hollow spherical and octahedral nodes. The stiffness matrixes of these nodes have been derived by conducting analyses on the computer for six sizes each of the Octa and spherical nodes. Using the stiffness matrix of the node, a new method of incorporating this into the regular analysis of a space truss has been developed. The new method proposed yields realistic values for the forces in the members and takes into account the elastic deflections in the node under the action of member forces. Implementation of the proposed method has been carried out by writing a custom program using state-of-the-art object oriented programming techniques. A sample problem has been analyzed using this program to demonstrate the effect of including joint flexibility. The effect of flexibility of nodes on the effective length of compression members in double-layer grids has been evaluated. The effect of compliance on the dynamic characteristics of a space frame has also been evaluated for the sample space frame with flexible joints. The analysis program has been modified to evaluate the natural frequencies of the system using rigid or flexible nodes.
The study of the Octanode and spherical node under the action of uniaxial compression
and tension dominates the contents of Chapter 3. The two types of nodes have been
analyzed using commercially available finite element software considering material
nonlinearity. The stress patterns from the analyses have been examined thoroughly.
Two consistent methods for fixing the load at yield in both uniaxial compression and
tension have been proposed using the load-displacement curve. Yield loads for all the
nodes have been evaluated using both the methods and the results agree well between the
two methods. Three material yield values have been selected for each of the node size
for evaluating the yield values viz. 240,320 and 415 MPa. The members of a double layer
grid are connected to the nodes by bolts and holes are drilled in the nodes for this
purpose. The bolthole patterns differ between two popular types of double-layer grids.
Both these bolthole patterns have been modeled separately in the above exercise and the
results for these two have been shown to be approximately the same. The effect of
varying diameters of the boltholes on the response of the nodes has been examined.
Relationships between the yield load, diameter, thickness and material yield have been
developed using the method of least squares. The differences in the behaviour of the nodes under uniaxial compression and tension have been discussed. Ramberg Osgood type of relationships have been worked out for all the load-displacement curves obtained from the analyses. The simulation of non-linear behaviour of nodes with cracks with plastic crack closing forces have been carried out with useful insights into the behaviour of the two types of nodes in uniaxial compression and tension.
Chapter 4 is devoted largely for studying the two types of nodes under the influence of biaxial load combinations. The combinations studied are dual compression, dual tension and compression-tension. In all cases equal loads are applied along two orthogonal; directions in the horizontal plane. Stress patterns have been examined for each type of load combination and yield values for each case have been obtained using one of the methods proposed in chapter 3. These have been compared with the corresponding uniaxial values in both compression and tension. Some useful inferences have been possible by studying the behaviour of the nodes under the various biaxial load combinations. In each case, relationships between the biaxial yield load, uniaxial yield load, diameter of node, thickness of node and material yield of node have been obtained using the method of least squares. The nodes have been analyzed under some selected Multi-axial loading and combinations of load which cause yield based on the second method proposed in Chapter 3 have been obtained and tabulated. However, a proper and thorough study of the nodes under multi-axial loading proved to be beyond the scope of this thesis.
Chapter 5 contains the contributions made towards developing new methods and algorithms for obtaining the several results of chapters 2, 3 and 4, using object oriented programming (OOP) techniques. The contributions have been in Object Pascal, the underlying language of Delphi, a popular RAD tool developed by Borland/Inprise of USA. Several new modules have been developed to reliably handle the large amounts of data generated by the hundreds of analyses detailed in chapters 2,3 and 4. The ease with which new methods were possible to be incorporated into existing software using OOP has been demonstrated, with source code examples. Comparisons with other types of tools available and die advantages of using OOP have also been demonstrated using the experience during the preparation of this thesis. A strong case for OOP as an indispensable tool for the researcher has been made.
Chapter 6: Several important conclusions and suggestions for future work have been made.
Appendix 1 contains a brief note on the Method of Least Squares.
Appendix 2 contains a small write-up on Delphi and OOP. Concepts of OOP have been briefly described and comparisons between three popular OOP languages have been attempted. A brief description of the features in Delphi's Object Pascal has also been provided.
Appendix 3 contains the listing of Unit Arrays, which is a general purpose unit developed to make handling of large arrays easy. Several matrix calculations have been implemented which make the unit extremely useful for programmers.
Appendix 4 contains the full listing of program FormK, which has been developed for chapter 2 to derive the fall stiffness matrix of a space frame node. The program picks up results from several analyses, forms a few columns of the stiffness matrix and then fills up the rest using the cyclic symmetry present in the space frame node. This program is given in full, with the intention that other researchers may find it useful to use it as-is or use after making small alterations to suit their circumstances. OOP is known for fast, reliable and easy ways of implementing modifications to existing code.
Appendix 5 provides the full listing of the Object Pascal program for extracting Eigenvalues of a space truss with rigid joints or flexible joints. The incorporation of flexibility of the joints proposed in chapter 2 has been implemented. Descriptions of the program's implementations have been provided in chapter 5.
Bibliography contains the alphabetical list of references.
4
Wong, Chun-kuen, and 黃春權. "Symmetry reduction for geometric nonlinear analysis of space structures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31214721.
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5
Wong, Chun-kuen. "Symmetry reduction for geometric nonlinear analysis of space structures /." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B18379734.
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6
Ball, Jeffrey Craig. "Design and analysis of multifunctional composite structures for nano-satellites." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2572.
Full textAbstract:
Thesis (MTech (Mechanical Engineering))--Cape Peninsula University of Technology, 2017.The aim of this thesis is to investigate the applications of multifunctional compos- ite (MFC) technology to nano-satellite structures and to produce a working concept design, which can be implemented on future Cube-Satellites (CubeSats). MFC tech- nologies can be used to optimise the performance of the satellite structure in terms of mass, volume and the protection it provides. The optimisation of the structure will allow further room for other sub-systems to be expanded and greater payload allowance. An extensive literature view of existing applications of MFC materials has been conducted, along with the analysis of a MFC CubeSat structural design account- ing for the environmental conditions in space and well-known design practices used in the space industry. Numerical analysis data has been supported by empirical analysis that was done where possible on the concept material and structure. The ndings indicate that the MFC technology shows an improvement over the conventional alu- minium structures that are currently being used. Improvements in rigidity, mass and internal volume were observed. Additional functions that the MFC structure o ers include electrical circuitry and connections through the material itself, as well as an increase electromagnetic shielding capability through the use of carbon- bre composite materials. Empirical data collected on the MFC samples also show good support for the numerical analysis results. The main conclusion to be drawn from this work is that multifunctional composite materials can indeed be used for nano-satellite structures and in the same light, can be tailor-made to the speci c mission requirements of the satellite. The technology is in its infancy still and has vast room for improvement and technological development beyond this work and well into the future. Further improvements and additional functions can be added through the inclusion of various other materials.
7
Jau, Jih Jih. "Geometrically nonlinear finite element analysis of space frames." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/54302.
Full textAbstract:
The displacement method of the finite element is adopted. Both the updated Lagrangian formulation and total Lagrangian formulation of a three-dimensional beam element is employed for large displacement and large rotation, but small strain analysis.
A beam-column element or finite element can be used to model geometrically nonlinear behavior of space frames. The two element models are compared on the basis of their efficiency, accuracy, economy and limitations.
An iterative approach, either Newton-Raphson iteration or modified Riks/Wempner iteration, is employed to trace the nonlinear equilibrium path. The latter can be used to perform postbuckling analysis.Ph. D.
8
Lovejoy, Vincent Dean. "Dynamics and control of a planar truss actuator." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/52056.
Full textAbstract:
Recent demands in large space structure technology have suggested the use of active control actuators integral to a structures' construction. The concept of a 3-D (triangular cross-sectioned) active truss is presented. The linear equations of motion for one plane of the truss are derived. A model for a generic flexible beam is then appended to the planar truss model. A linear time-invariant optimal control law is found, followed by a presentation of an experimental planar truss built to test the concept. Physical parameters are then substituted into the dynamic model and several sets of control gains are found. The "Kalman'' gains are applied to the experimental structure. Experimental results are compared to expected theoretical results with good (30%) correlation. Conclusions are drawn and suggestions are made for further research.Master of Science
9
Smith, William Travis. "A synthesis procedure for array feeds to improve radiation performance of large distorted reflector antennas." Diss., This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-07102007-142513/.
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10
Clark, William Walker. "A planar comparison of actuators for vibration control of flexible structures." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43387.
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11
Alqasimi, Ahmad. "Design Of Shape Morphing Structures Using Bistable Elements." Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5897.
Full textAbstract:
This dissertation presents new concepts and methodology in designing shape-morphing structures using bistable elements. Developed using the Pseudo-Rigid-Body Model (PRBM), linear bistable compliant mechanism elements produce predictable and controllable length changes. Step-by-step design procedures are developed to guide the design process of these bistable elements. Two different examples of Shape-Morphing Space Frames (SMSFs) were designed and prototyped utilizing the bistable linear elements in a single-layer grid, in addition to flexures and rigid links, to morph a cylindrical space frame into both a hyperbolic and a spherical space frame. Moreover, bistable unit-cell compliant-mechanism elements were also developed to morph a compact structure from a specific initial shape to a final specific shape. The detailed design of those unit cells were done using Computer-aided design (CAD) software following a novel design procedure to transform a one-degree-of-freedom mechanism into a structure with sufficient compliance within its links to toggle between two chosen stable positions. Two different design examples were investigated in this research and prototyped to demonstrate the ability to morph disks into a hemisphere or a sphere with the structure being stable in both states (disk and sphere).
12
Purdey, Brian. "Conditions under which the performance of teams is compromised : the role of workspace density in triggering the collapse of workgroups in commercial office settings." Thesis, Faculty of Architecture, Design and Planning, 2010. http://hdl.handle.net/2123/17557.
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13
Jeong, Sang Min. "Analysis of Vibration of 2-D Periodic Cellular Structures." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7122.
Full textAbstract:
The vibration of and wave propagation in periodic cellular structures
are analyzed. Cellular structures exhibit a number of desirable
multifunctional properties, which make them attractive in a variety of
engineering applications. These include ultra-light structures, thermal
and acoustic insulators, and impact amelioration systems, among others.
Cellular structures with deterministic architecture can be considered
as example of periodic structures. Periodic structures feature unique
wave propagation characteristics, whereby elastic waves propagate only
in specific frequency bands, known as "pass band", while they are
attenuated in all other frequency bands, known as "stop bands". Such
dynamic properties are here exploited to provide cellular structures
with the capability of behaving as directional, pass-band mechanical
filters, thus complementing their well documented multifunctional
characteristics.
This work presents a methodology for the analysis of the dynamic
behavior of periodic cellular structures, which allows the evaluation
of location and spectral width of propagation and attenuation regions.
The filtering characteristics are tested and demonstrated for
structures of various geometry and topology, including cylindrical
grid-like structures, Kagom and eacute; and tetrhedral truss core lattices.
Experimental investigations is done on a 2-D lattice manufactured out
of aluminum. The complete wave field of the specimen at various
frequencies is measured using a Scanning Laser Doppler Vibrometer
(SLDV). Experimental results show good agreement with the methodology
and computational tools developed in this work. The results demonstrate
how wave propagation characteristics are defined by cell geometry and
configuration. Numerical and experimental results show the potential of
periodic cellular structures as mechanical filters and/or isolators of
vibrations.
14
Kociecki, Margaret E. "A Two-Phase Genetic Algorithm for Simultaneous Dimension, Topology, and Shape Optimization of Free-Form Steel Space-Frame Roof Structures." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1343148491.
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Patel, Jayendra R. "Post processor for design of reinforced concrete space frames using object oriented programming." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-07292009-090457/.
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16
Nagle, Anuja Pramod [Verfasser], Dieter [Akademischer Betreuer] Weichert, and Christoph [Akademischer Betreuer] Broeckmann. "A numerical based design approach for automotive space frame structures considering their crash behaviour / Anuja Pramod Nagle ; Dieter Weichert, Christoph Broeckmann." Aachen : Universitätsbibliothek der RWTH Aachen, 2015. http://d-nb.info/1127589814/34.
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17
Wehrle, Erich Josef [Verfasser], Horst [Akademischer Betreuer] Baier, and Fabian [Akademischer Betreuer] Duddeck. "Design optimization of lightweight space-frame structures considering crashworthiness and parameter uncertainty / Erich Josef Wehrle. Gutachter: Fabian Duddeck ; Horst Baier. Betreuer: Horst Baier." München : Universitätsbibliothek der TU München, 2015. http://d-nb.info/107612500X/34.
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18
Cornelli, Samuel. "Análise estática e dinâmica de pórticos espaciais com incerteza no carregamento utilizando o método de elementos finitos." reponame:Repositório Institucional da UCS, 2014. https://repositorio.ucs.br/handle/11338/1070.
Full textAbstract:
Neste trabalho são descritas análises estática e dinâmica em regime elástico de pórticos espaciais com incerteza no carregamento utilizando o método de elementos finitos (MEF). A abordagem do problema dinâmico estrutural de vibrações forçadas será feita dentro do regime elástico linear com amortecimento viscoso. O pórtico é abordado com teoria de viga fina onde são considerados os acoplamentos devido às forças normais e a torção sobre o modelo de flexão em viga fina de Bernoulli-Euler. A formulação forte do problema dinâmico da viga com carga axial é obtida a partir das equações de equilíbrio de Euler-Lagrange, decorrentes do princípio variacional de Hamilton e, a formulação forte do problema dinâmico do eixo longo sujeito a torção é determinada utilizando o modelo de torção de Saint-Venan. Para a determinação da formulação fraca para o elemento de viga tridimensional foi aplicado o método dos resíduos ponderados Galerkin. Também é descrita neste trabalho, a análise da confiabilidade estrutural considerando a incerteza no carregamento e, em algumas propriedades mecânicas dos materiais, utilizando o método de Monte Carlo (MMC). A série de Neumann foi utilizada como alternativa para reduzir o tempo de processamento do problema dinâmico. A análise simultânea das diversas variáveis foi abordada utilizando a estatística multivariada. Os resultados da analise estática e de vibrações livres dos exemplos numéricos são apresentados com o intuito de validar os métodos contidos neste trabalho comparando-os com resultados obtidos utilizando um software comercial de análise estrutural.Submitted by Ana Guimarães Pereira (agpereir@ucs.br) on 2015-11-23T16:10:16Z No. of bitstreams: 1 Dissertacao Samuel Cornelli.pdf: 2680799 bytes, checksum: bcb4daa1a00ba8c03aafdea11fa42778 (MD5)
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In this thesis, static and dynamic analysis of elastic space frames with regime uncertainty in loading using the finite element method (FEM) are described. A structural approach to the dynamic problem of forced vibrations will be made within the linear elastic regime with viscous damping. The structure is approached with thin beam theory which the couplings are considered normal forces due to twisting and bending about the model thin Bernoulli-Euler beam. The strong formulation of the dynamic problem of the beam with axial load is obtained from the equilibrium equations of Euler-Lagrange equations arising from the variational principle of Hamilton and the strong formulation of the dynamic problem of the long shaft under torsion is determined using the model of twist of Saint-Venan. To determine the weak formulation for three-dimensional beam element applies the Galerkin method of weighted residues. Is also described in this study, the analysis of structural reliability considering the uncertainty in loading and some mechanical properties of materials using the Monte Carlo method (MMC). Neumann series will be used as an alternative to reduce the processing time of the dynamic problem. The simultaneous analysis of several variables is addressed using multivariate statistics. Some results of numerical examples are presented in order to validate the methods contained in this work compared with the results obtained from structural analysis of commercial software.
19
Maggard, William P. "Adaptive control of flexible systems using self-tuning digital notch filters." Ohio : Ohio University, 1987. http://www.ohiolink.edu/etd/view.cgi?ohiou1183056097.
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20
Çelik, İlyas Devran Ay Zeki. "Merkezi ve dışmerkezi güçlendirilmiş çelik uzay çerçevelerin sismik performansı /." Isparta : SDÜ Fen Bilimleri Enstitüsü, 2008. http://tez.sdu.edu.tr/Tezler/TF01118.pdf.
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21
Badár, Tomáš. "Výstavní pavilon." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-392108.
Full textAbstract:
The aim of the work is to design steel structure exhibition pavilion. The building is situated in Brno. The construction is processed in two options. The option A is designed in variant of arched space frame. The internal ground plan dimensions of the building are 42 x 72 meters. Space frame is hinged to the structure of columns. Height in the top of the ship is 16,834 metres. The option B is designed in variant arched truss. The internal ground plan dimensions of the building are 42 x 70 meters. Arched truss is hinged to the structure of columns. Height in the top of the ship is 18,334 metres. The spatial rigidity of the structure is ensured by cross braces. Roof cladding and walls will be made using sandwich panels of KINGSPAN. The main material will be used steel S235.
22
Belkacem, Sihem. "Recherche de forme par relaxation dynamique des structures reticulees spatiales autocontraintes." Toulouse 3, 1987. http://www.theses.fr/1987TOU30146.
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23
Bossens, Frédéric. "Amortissement actif des structures câblées: de la théorie à l'implémentation." Doctoral thesis, Universite Libre de Bruxelles, 2001. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211598.
Full textAbstract:
Cette thèse s'inscrit dans la continuation du travail de Younes Achkire, consacré au contrôle actif des ponts haubanés. Elle traite de l'implémentation d'un système de contrôle actif sur des maquettes de structures câblées. Deux types de structures sont étudiés expérimentalement: les ponts haubanés et les treillis spatiaux. Après une brève introduction sur l'usage du contrôle actif dans ces domaines, le chapitre 2 traite numériquement des mécanismes d'interaction entre le câble et la structure. Au chapitre 3, nous présentons la stratégie de contrôle que nous utilisons pour stabiliser une structure câblée: il s'agit d'un contrôle décentralisé, basé sur des paires capteur/actionneur colocalisées, placées au niveau des ancrages des câbles, chacune équipée d'un contrôleur Intégral Force Feedback. Nous présentons une théorie linéaire simplifiée permettant de dimensionner le système et de prévoir son efficacité. Elle est illustrée sur un exemple, et nous discutons de la validité de certaines hypothèses simplificatrices. Le chapitre 4 est consacré au contrôle actif des ponts haubanés. Nous y présentons 2 maquettes. La première, de petite taille (3m) représente un pylône de pont haubané en construction. Elle est équipée d'actionneurs piézoélectriques. La seconde, installée au Centre Commun de Recherche d'Ispra (Italie), mesure 30m de long, et est équipée d'actionneurs hydrauliques. Les expériences réalisées sur ces maquettes ont démontré l'efficacité du contrôle et la fiabilité de la théorie prédictive. Le contrôle du flottement des ponts est traité sur un exemple numérique. Le chapitre 5 relate nos expériences d'amortissement actif des treillis spatiaux. Deux structures ont été étudiées: une colonne en treillis équipée de 3 câbles actifs, et une structure triédrique suspendue à des cordons élastiques pour simuler l'absence de gravité, également munie de câbles actifs. Deux concepts d'actionneur piézoélectrique ont été testés. Nous avons ensuite examiné le problème de la saturation des actionneurs, et celui du contrôle actif des microvibrations (~10nm) d'une structure câblée. Le chapitre 6 conclut ce travail, en souligne les aspects originaux et donne quelques perspectives de développement.Doctorat en sciences appliquées
info:eu-repo/semantics/nonPublished
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Sung, Li-wen. "Grid Structure and Space." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/31598.
Full textAbstract:
From the ancient times, people used various kinds of natural material to build architecture. Because of the characteristics of natural materials, there are many limits to challenge the possibility of the architectural structure.After the fire of 1871 in Chicago, there were many incentives to convince Chicago architects to use steel as the material in grid structure buildings. For example, rising real estate prices, the advent of the safety elevator and availability of cost effective steel members. After that, grid structures play a very important role in modern architectural history.
Now, construction technologies are improving and hundreds of structure types can be used. Architects have more power to build various kinds of amazing space. For instance, TWA terminal of J.F.K. International Airport. However, the grid structure still has several advantages that can not be substituted: (1) It costs less money due to repetition of components across similar bays. (2) It reduces the construction time, and (3) It possesses an inherent order, a good prerequisite for plan and section. In addition, new technology extends the span limits of grid structures. Thus, grid structures have more chances to take on different roles in the definition of space.
This project is a study of the relations between structural grid and architectural space, and a search for several distinct spaces within the grid. In other words, the concept of the project is setting up a grid structure, then developing spacial ideas according to program. So, we can reserve the spirit of the grid structure, and it offers many chances to us to think about other roles that the grid structure can play.Master of Architecture
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Subramaniam, C. "Chemorhelogical Modeling Of Amine-Cured Multifunctional Epoxy Resin Systems Used As Matrices In Aerospace Composites." Thesis, Indian Institute of Science, 1994. https://etd.iisc.ac.in/handle/2005/127.
Full textAbstract:
High performance multifunctional epoxy resin systems are becoming increasingly important as matrix materials for the advanced composites used in aerospace, electronics, automotive and other industries. In a composite based on epoxy resin systems, a three-dimensional network of the matrix is formed around the reinforcing fibre as a result of the chemical reaction between the resin and the curing agent. This chemical process, known as curing, is an important event to he considered in the production of composite components made up of these resin systems. Two process parameters namely viscosity and chemical conversion are of paramount significance in the production of composite materials Curing studies of the resin systems based on these two parameters, would therefore assume great importance in deciding the performance reliability of the end product.
The objectives of the present investigation are
1. to study the cure kinetics of three thermoset resin systems, viz.,
i) epoxy novolac (EPIT)/ diamino diphenyl methane{DDM), ii) trigylcidyl para- ammo phenol (TGPAP)/toluene diamine (TDA) and iii) tetraglycidyl diamino diphenyl methane (TGDDM)/pyridine diamine(PDA) using the cure kinetic models based on chemical conversion (α), Theological conversion (β) and viscosity.
2.to develop a correlation between a and viscosity (η) and modify an existing autocatalytic model based on α, to the viscosity domain and
3.to investigate the cure behaviour of these systems in terms of the TTT cure diagram and its associated models.
EPN/DDM, TGPAP/PDA and TGDDM/PDA resin systems were chosen for the studies to represent a range of functionalities, The cure was monitored using differential scanning calorimetry (DSC), fourier transform infrared (FTIR) and dynamic mechanical analysis (DMA) techniques by following the changes in enthalpy, functional groups and rheology, respectively.
The kinetic parameters namely, order of reaction and activation energy were estimated from dynamic DSC data using the methods of Freeman-Carroll and Ellerstein using nth rate expression. Barton, Kissinger and Osawa methods were employed to find out the activation energy from the peak/equal conversion at different heating rates. Isothermal DSC data were also analyzed using nth order model and it was observed that the data could be fitted satisfactorily only for higher temperatures The results obtained from the analysis of both dynamic and isothermal DSC data using nth order model clearly indicate that this model is inadequate for describing the cure behavior. The isothermal DSC data was analyzed by the autocatalytic models of Hone and Kamal Good correlation was observed with Hum and Kamal models up to 60-70%, 25% and 45% conversions for EPN/DDM, TGPAP/TDA and TCDDM/PDA systems respectively. However, the parameters m and n in Kamal model were found to be temperature dependent for EPN/DDM and TCPAP/TDA systems. The limited applicability of the autocatalytic models IK attributed to the counter-effect offered by the intra-molecular bonding taking place.
The primary amine and epoxy groups conversions obtained from FTIR were analyzed using autocatalytic model and the kinetic parameters were calculated. The reactivity ratio of the primary amine and the secondary amine with epoxy was found to be dependent on temperature in agreement with the recent findings reported m the literature.
The existing models that relate the cure kinetics and the rheological changes, are dual Arrhenius nth order model and autocatalytic model The nth order kinetic model was used to evaluate the kinetic parameters using the viscosity data at different cure temperatures under isothermal conditions As the storage modulus, G' is proportional to the chemical cross links and becomes significant only after the g<4 point, it was used to follow the changes in conversion known as rheoconversion after the gel point The rheoconversion was found by normalizing the G' data with G1^, the storage modulus of the fully cured resin It was used to study the cuie kinetics using an autocatalytic model The kinetic parameters such as rate constant, acceptation and retardation parameters were evaluated and that temperature dependence was established.
While the existing models relate viscosity and conversion only up to gel point the new proposed model, termed VISCON model takes into account the changes up to vitrification. The relation so developed is used to modify the autocatalytic cure model based on chemical conversion. The parameters appearing in this model were evaluated using Levenberg-Marquardt error minimization algorithm. The kinetic parameters obtained are comparable with the values estimated using the DSC data.
All the models cited above represent the microkinetic aspects. The models based on the information of TTT cure diagrams, however, represent the macrokinetic aspects of the cure, as they are based on the cure stages such as gelation and vitrification TTT diagram relates the cure characteristics like cure temperature, cure time, Ta and, indirectly, chemical conversion Hence the ultimate properties of the composite could he predicted and established with the help of the models based on TTT cure diagrams The changes in the storage modulus, G1 and loss modulus, G", were followed to identify the gel and vitrification points of the resin systems at different cure temperatures Gel point and vitrification point were used to generate gelation and vitrification hues in the construction of TTT cure diagrams for EPN/DDM, TGPAP/TDA and TGDDM/PDA resin systems Theoretical TTT diagrams were generated and IBO-T, contours were established using the TTT diagram-based models The cure schedule for the resin systems investigated could be determined from the TTT diagram and the respective rheological data.
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Subramaniam, C. "Chemorhelogical Modeling Of Amine-Cured Multifunctional Epoxy Resin Systems Used As Matrices In Aerospace Composites." Thesis, Indian Institute of Science, 1994. http://hdl.handle.net/2005/127.
Full textAbstract:
High performance multifunctional epoxy resin systems are becoming increasingly important as matrix materials for the advanced composites used in aerospace, electronics, automotive and other industries. In a composite based on epoxy resin systems, a three-dimensional network of the matrix is formed around the reinforcing fibre as a result of the chemical reaction between the resin and the curing agent. This chemical process, known as curing, is an important event to he considered in the production of composite components made up of these resin systems. Two process parameters namely viscosity and chemical conversion are of paramount significance in the production of composite materials Curing studies of the resin systems based on these two parameters, would therefore assume great importance in deciding the performance reliability of the end product.
The objectives of the present investigation are
1. to study the cure kinetics of three thermoset resin systems, viz.,
i) epoxy novolac (EPIT)/ diamino diphenyl methane{DDM), ii) trigylcidyl para- ammo phenol (TGPAP)/toluene diamine (TDA) and iii) tetraglycidyl diamino diphenyl methane (TGDDM)/pyridine diamine(PDA) using the cure kinetic models based on chemical conversion (α), Theological conversion (β) and viscosity.
2.to develop a correlation between a and viscosity (η) and modify an existing autocatalytic model based on α, to the viscosity domain and
3.to investigate the cure behaviour of these systems in terms of the TTT cure diagram and its associated models.
EPN/DDM, TGPAP/PDA and TGDDM/PDA resin systems were chosen for the studies to represent a range of functionalities, The cure was monitored using differential scanning calorimetry (DSC), fourier transform infrared (FTIR) and dynamic mechanical analysis (DMA) techniques by following the changes in enthalpy, functional groups and rheology, respectively.
The kinetic parameters namely, order of reaction and activation energy were estimated from dynamic DSC data using the methods of Freeman-Carroll and Ellerstein using nth rate expression. Barton, Kissinger and Osawa methods were employed to find out the activation energy from the peak/equal conversion at different heating rates. Isothermal DSC data were also analyzed using nth order model and it was observed that the data could be fitted satisfactorily only for higher temperatures The results obtained from the analysis of both dynamic and isothermal DSC data using nth order model clearly indicate that this model is inadequate for describing the cure behavior. The isothermal DSC data was analyzed by the autocatalytic models of Hone and Kamal Good correlation was observed with Hum and Kamal models up to 60-70%, 25% and 45% conversions for EPN/DDM, TGPAP/TDA and TCDDM/PDA systems respectively. However, the parameters m and n in Kamal model were found to be temperature dependent for EPN/DDM and TCPAP/TDA systems. The limited applicability of the autocatalytic models IK attributed to the counter-effect offered by the intra-molecular bonding taking place.
The primary amine and epoxy groups conversions obtained from FTIR were analyzed using autocatalytic model and the kinetic parameters were calculated. The reactivity ratio of the primary amine and the secondary amine with epoxy was found to be dependent on temperature in agreement with the recent findings reported m the literature.
The existing models that relate the cure kinetics and the rheological changes, are dual Arrhenius nth order model and autocatalytic model The nth order kinetic model was used to evaluate the kinetic parameters using the viscosity data at different cure temperatures under isothermal conditions As the storage modulus, G' is proportional to the chemical cross links and becomes significant only after the g<4 point, it was used to follow the changes in conversion known as rheoconversion after the gel point The rheoconversion was found by normalizing the G' data with G1^, the storage modulus of the fully cured resin It was used to study the cuie kinetics using an autocatalytic model The kinetic parameters such as rate constant, acceptation and retardation parameters were evaluated and that temperature dependence was established.
While the existing models relate viscosity and conversion only up to gel point the new proposed model, termed VISCON model takes into account the changes up to vitrification. The relation so developed is used to modify the autocatalytic cure model based on chemical conversion. The parameters appearing in this model were evaluated using Levenberg-Marquardt error minimization algorithm. The kinetic parameters obtained are comparable with the values estimated using the DSC data.
All the models cited above represent the microkinetic aspects. The models based on the information of TTT cure diagrams, however, represent the macrokinetic aspects of the cure, as they are based on the cure stages such as gelation and vitrification TTT diagram relates the cure characteristics like cure temperature, cure time, Ta and, indirectly, chemical conversion Hence the ultimate properties of the composite could he predicted and established with the help of the models based on TTT cure diagrams The changes in the storage modulus, G1 and loss modulus, G", were followed to identify the gel and vitrification points of the resin systems at different cure temperatures Gel point and vitrification point were used to generate gelation and vitrification hues in the construction of TTT cure diagrams for EPN/DDM, TGPAP/TDA and TGDDM/PDA resin systems Theoretical TTT diagrams were generated and IBO-T, contours were established using the TTT diagram-based models The cure schedule for the resin systems investigated could be determined from the TTT diagram and the respective rheological data.
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Kaveh, Mohammad. "Topological optimization of rigidly jointed space frames." Thesis, Cardiff University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.238227.
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Zhou, Qing. "Combined linear/nonlinear stability analysis of plane and space frames." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-07112009-040327/.
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Pugh, James Christopher. "A user friendly preprocessor for plane and space frames and space trusses." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/44655.
Full textAbstract:
A user friendly preprocessor was developed and documented for the plane and space frame and space truss structural analysis programs that are based on the matrix displacements method. This preprocessor is comprised of three programs. The main program in the preprocessor is to allow the user to create error free input data files. This program also allows modifications of existing input data files. The two other programs are the library manager and the graphics presentation. The library manager is used to manage the libraries of the element and material properties. The graphics presentation is used to display a plane structure on the graphics display. In Chapter 2, the development of a user friendly preprocessor is discussed. After a short review of the extension of the analysis program from plane frame to space frame in Chapter 3, the preprocessor and its supporting programs are described in detail in the user manual in Chapter 4. Possible extensions to the preprocessor are discussed in Chapter 5. The appendix contains examples of input data files for these structural analysis programs.
Master of Science
30
Agrawal, Devanshu. "The Complete Structure of Linear and Nonlinear Deformations of Frames on a Hilbert Space." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/etd/3003.
Full textAbstract:
A frame is a possibly linearly dependent set of vectors in a Hilbert space that facilitates the decomposition and reconstruction of vectors. A Parseval frame is a frame that acts as its own dual frame. A Gabor frame comprises all translations and phase modulations of an appropriate window function. We show that the space of all frames on a Hilbert space indexed by a common measure space can be fibrated into orbits under the action of invertible linear deformations and that any maximal set of unitarily inequivalent Parseval frames is a complete set of representatives of the orbits. We show that all such frames are connected by transformations that are linear in the larger Hilbert space of square-integrable functions on the indexing space. We apply our results to frames on finite-dimensional Hilbert spaces and to the discretization of the Gabor frame with a band-limited window function.
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Zheng, Zhijun. "A preprocessor for the analysis of space frames in the Microsoft Windows environment." Master's thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-05042010-020032/.
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El, Hussieny Ossama. "Modèle numérique de simulation du comportement au feu des ossatures métalliques." Châtenay-Malabry, Ecole centrale de Paris, 1988. http://www.theses.fr/1988ECAP0076.
Full textAbstract:
Modèle d'une structure tridimensionnelle à barres d'acier sous incendie. Développement en trois étapes: propriétés thermophysiques et mécaniques de l'acier; comportement non linéaire géométrique d'une structure tridimensionnelle; comportement d'une structure tridimensionnelle soumise a des gradients thermiques. Compression avec des essais dans les fours de la station d'essais du CTICM. Prise en compte des grandes déformations, et du fluage, avec une description dans le temps des effets de l'incendie
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Knipe, Kevin. "Structural Analysis and Active Vibration Control of Tetraform Space Frame for Use in Micro-Scale Machining." Master's thesis, University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3531.
Full textAbstract:
This research thesis aims to achieve the structural analysis and active vibration damping of the Tetraform machining structure. The Tetraform is a space frame made up of four equilateral triangles with spherical masses at the four vertices. This frame was originally developed for grinding of optical lenses and is now being adapted for use in micro-precision milling. The Tetraform is beneficial to the milling process due to its exceptionally high dynamic stiffness characteristics, which increases the machining stability and allows for higher material removal rates and accuracy. However, there are still some modes of vibration that are critical to the milling process and need to be dampened out. Under operating conditions of many structures, resonant modes of vibration can easily be excited which often lead to structural failure or significant reduction in operating performance. For the milling application, resonant frequencies of the machining structure can severely limit the milling process. The goal of the presented research is to increase surface and subsurface integrity with optimal material removal rate and least possible machining vibration, while maintaining accurate precision and surface finish. The vibrations from the machine tool not only affect the quality of the machined part but also the machine tool itself, since the cutting tool is susceptible to break or wear quickly when operating at high vibration modes, thus inevitably decreasing tool life. Vibration control has gained considerable attention in many areas including aerospace, automotive, structural, and manufacturing. Positive Position Feedback (PPF) is a vibration control scheme that is commonly used for its robust stability properties. A PPF controller works as a low pass filter, eliminating instability from unmodeled higher-frequency modes. The PPF controller concept is used in developing an active vibration control scheme to target the critical frequencies of the Tetraform. The controller is implemented with use of piezoelectric actuators and sensors, where the sensors are bonded to the opposing sides of the beams as the actuators, allowing for the assumption of collocation. The sensor/actuator pairs are placed at an optimal location on the Tetraform with high modal displacements for all the critical frequencies. Multiple finite element models are developed in order to analyze the structural dynamics and allow for controller design. A model is developed in the finite element software ANSYS and is used to obtain the Tetraform's dynamic characteristics, which include natural frequencies and mode shapes. This model is also used to visualize the changes in mode shapes due to structural modifications or different material selections. Other models are also developed in Matlab and Simulink. This consists of the creation of a finite element model which is then converted to state space. The piezoelectric transducers are included in this model for the input and output of the state space model. This model can be used for controller design where the goal is to create maximum decibel reduction at critical frequencies while attempting to minimize controller effort.M.S.
Department of Mechanical, Materials and Aerospace Engineering;
Engineering and Computer Science
Mechanical Engineering MSME
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King, Jonathan Lee. "Artifacts of Questions Asked." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/76901.
Full textAbstract:
The cyclic trajectory described here exemplifies a loosely defined, continuously evolving set of questions, results, and methodologies that have emerged during the process of design by making. Through a series of prototypical building components and assemblies this collection presents a design process that began with a top-down program-specific design process that informed the development of a unique building system and enabled a bottom up formal exploration. As the design thesis for the first professional Master of Architecture degree, this exploration surrounds the design, fabrication, and deployment of a series of component-based building assemblies. One example, the SEEDS Pavilion At Hawks Ridge, serves as a remote base of operations for a local youth organization that supports field-based environmental education. The pavilion continues an investigation of user assembled construction and is based on a component group that can be assembled on-site by camp children. Each building component was manufactured using on campus fabrication laboratories and was assembled on-site by a group of supervised SEEDS camp student-volunteers during a two-day design-build workshop at the Hawk's Ridge Preserve in Floyd, Virginia. The form of the structure is derived by the limitation of component number, size, and assembly sequence and represents the conflict between a parametrically derived prescriptive shape and the forms that result from the bottom up exploration of the physical system itself. The component-based construction is made possible by a series of nodal linkage assemblies designed to accommodate variations in on-site conditions using a strategic 'sloppy detail' that enables a high degree of assembly and deployment tolerance. The following collection of sequential images outlines construction of several prototypical components and assemblies and is intended to represent a continuance, not an end, to a long-term effort.Master of Architecture
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Aydogdu, Ibrahim. "Optimum Design Of 3-d Irregular Steel Frames Using Ant Colony Optimization And Harmony Search Algorithms." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612285/index.pdf.
Full textAbstract:
Steel space frames having irregular shapes when subjected to lateral loads caused
by wind or earthquakes undergo twisting as a result of their unsymmetrical
topology. As a result, torsional moment comes out which is required to be resisted
by the three dimensional frame system. The members of such frame are generally
made out of steel I sections which are thin walled open sections. The simple beam
theory is not adequate to predict behavior of such thin-walled sections under
torsional moments due to the fact that the large warping deformations occur in the
cross section of the member. Therefore, it is necessary to consider the effect of
warping in the design of the steel space frames having members of thin walled
steel sections is significant. In this study the optimum design problem of steel
space frames is formulated according to the provisions of LRFD-AISC (Load and
Resistance factor design of American Institute of Steel Construction) in which the
effect of warping is also taken into account. Ant colony optimization and harmony
search techniques two of the recent methods in stochastic search techniques are
used to obtain the solution of the design problem. Number of space frame examples is designed by the algorithms developed in order to demonstrate the
effect of warping in the optimum design.
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Kačírek, Michal. "Sportovní hala." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-372294.
Full textAbstract:
The aim of the final thesis is to design steel structure of the sports hall in Brno. The design is processed in two options. The option "A" is designed in variant of flat space frame with dimensions 78x46,5 m and the structure height is 13,0 m. The option "B" is designed in variant of truss girder with parabolic lower belt and purlin. Dimensions are 84x46,5 m and the structure height is 12,8 m. Roof covering and curtain walling is made of sendwich panels with polyurethane foam and trapezoidal sheet.
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Kyselá, Jana. "Dům krátké cesty." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-354949.
Full textAbstract:
The locality is situated in the city quarter Brno-Židenice in close proximity of the railway line connecting Brno and Česká Třebová. The area is delimited by the Bubeníčkova Street from the South, the Koperníkova Street from the East, by Lazaretní Street from the North and by a road copying the railway line from the West. The elemental form of the projected compound is divided into three blocks by pass-through axes. The blocks are interconnected with a common basement where underground car park is located. The blocks have up to six floors above ground. On the first floor, there is a variety of commercial spaces for shops and restaurants and in the middle there is a supermarket. In the northern object, there are situated different types of amenities (kinder-garden, leisure activities for children, spa) on the second and higher floors. On the top floor of this object we can find the flats as well as in the middle building from the second floor. The commercial areas, offices and library are situated in the southern block.
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Hoffmann, Dorothea. "Descriptions of motion and travel in Jaminjung and Kriol." Thesis, University of Manchester, 2012. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:158778.
Full textAbstract:
The thesis provides an in-depth analysis of motion event descriptions of two Australian indigenous languages. Jaminjung is a highly endangered non Pama-Nyungan language with approximately 50 remaining speakers. Kriol, an English-lexified Creole, is spoken by about 20.000 people in different varieties across northern Australia. While the languages are typologically very different, occupancy of the same linguistic and cultural area provides an intriguing opportunity to examine the effects of culture and language contact on conceptual components and distribution patterns in discourse. This investigation also applies and tests a number of existing frameworks and typologies regarding the linguistic encoding of motion and space in general. The thesis first provides an overview of the encoding of motion event descriptions in Jaminjung and Kriol. It becomes clear that, concerning overt marking of case, ground-encodings follow a systematic semantic pattern with no or rare case-marking for deictic terms, optional marking for toponyms and mandatory marking for all other types of landmarks. Furthermore, the structure and semantics of the motion verb phrase is investigated. Particularly noteworthy here is a study of asymmetrical serial verb constructions in Kriol which revealed a number of previously undescribed types. Following this, various proposals for a typology of Frames of Reference are applied. The notion of ‘anchor’ is at the centre of the analysis. The investigation shows that contextual restrictions for the use of Jaminjung’s absolute terms can be accounted for by a restriction on egocentric anchoring and ‘Orientation’ settings only. Furthermore, absolute Frame of Reference is realised differently in Roper and Westside Kriol respectively, suggesting an ongoing influence of the traditional languages spoken by the respective communities rather than the lexifier English. Jaminjung and Kriol, additionally, prefer the use of absolute over relative Frame of Reference. The following chapter investigates how lexicalisation patterns influence the distribution of path and manner encodings in discourse. After concluding that Jaminjung might best be described as following an equipollently-framed pattern and Kriol as satellite-framed, path and manner salience is investigated in different types of discourse using a dataset of motion event encodings in a Frog Story collection and a general corpus of various discourse environments. It is concluded that while the two languages behave very differently with regards to frequency patterns of ground- and other path-encodings, they show remarkable similarities in distributing path and manner over larger chunks of discourse. These findings suggest that cultural influences may sometimes override structural typological constraints. Finally, motion event encodings in specific types of discourse are analysed. Regarding route descriptions, speakers show a clear preference for dynamic over static modes of presentation. This includes encoding ‘fictive motion’ events for which a figure- and ground-based distinction is introduced. Additionally, concerning the use of deictics in a comparative analysis of different types of corpora for both languages, it was shown that the distribution of absolute terms remains stable across discourse environments while deictic usage differs drastically. Lastly, the concept of ‘motion’ is abstracted and described as a kind of structuring device in narratives. It is shown that the ‘journey’ within the story world is used by speakers of both languages to bridge episodes sometimes even overriding a temporal in favour of a spatial order of events.
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Šimberová, Iva. "Dům krátké cesty v Brně." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226761.
Full textAbstract:
Subject of the thesis is the architecture study of multifunctional architectural object based on the principle of creating intensive urban structures. Design area is located on the riverside Svitava, in the neighborhood the street Zvonařka . The aim of the project was to design an intensive structure that will meet the combination of features in order to achieve independence from the surrounding area and shorten the walking distance. The proposal itself, the principle of porosity. This generates a set of objects fulfilling different functions, public, semi-public and private spaces - atrium terraces, green roofs and balconies. The building has nine floors above ground and two underground floors used for parking. On the first floor there is a bank and retail space, the other floors are then situated administration, library, fitness, health center and on the top two floors of living. Construction of the building is designed as a reinforced concrete frame, sits on the pilots. The facade is solved soberly with regard to function, the main expressive elements are white façade,gray facing and glazing surface of the first two floors
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Špirková, Silvia. "Nová Jižní čtvrť a její propojení s řekou Svratkou." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-400112.
Full textAbstract:
The assignment of the diploma thesis follows the pre-diploma project of an urbanistic design - New South District and its Connection to Svratka. The subject of the thesis is a design of the apartment building on the riverside of Svratka. The thesis has a form of architectonic study. The architectural design is interconnected with surrounding built-up area and preserves the existing height level. It also respects the definened riverside. The construction has a shape of the letter "U" opening towards the river. The shift of the north "wing" of the building creats widened "inner block". It offers diverse views on the river and accentuates an "incorporation" of the river to inner block. The residential building has six floors and two underground parking floors. It is devided into 7 units with separate entrances. The proposed part of the building is located directly on the riverbank. It includes 16 housing units and one leasable space.
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Banič, Róbert. "Multifunční budova na ul. Obchodná v Bratislavě." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-409975.
Full textAbstract:
Předmětem této diplomové práce je návrh a projektová dokumentace pětipodlažní multifunkční budovy se 2 suterénními podlažími pro parkování pro 52 aut. První 2 patra jsou veřejná - k pronájmu je 23 samostatných prostor. Horní 3 podlaží obsahují 18 bytů a mají samostatné vchody se dvěma schodišti a 2 výtahy. Budova má dvě úrovně střechy a obě jsou pochozí s malým parkem a vegetací. Budova se nachází v hlavním městě Slovenska, Bratislavě, na Obchodní ulici. Záměrem je nahradit dvě staré budovy ve velmi špatném stavu. Z architektonického hlediska má tato budova zapadat do historického vzhledu ulice úpravou tvaru oken a materiálů a zároveň působit mírně moderně. Z konstrukčního hlediska má budova rámové nosné konstrukce z betonových nosníků sloupů a obousměrně vyztužených betonových desek vyplněných dřevěnými konstrukcemi a lehké sádrokartonové příčky.
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Kopecký, Ladislav. "Ocelová konstrukce průmyslové budovy." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240169.
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Industrial hall with storage outbuilding. The length of the hall is 72 meters and width of 30 meters. The main hall has a span 24 meters and the outbuilding has a span 6m. The distance between primary steel frame is 6 meters. The height of the main hall is 10.7 meters and a height of outbuilding is 13.0 metres. The roof is flat with roof slope of 3.5% the main hall and 8.75% outbuilding. The structural system of the hall's bar structure. Primary steel frame is designed as a steel frame rafter with eaves haunch. In the roof structure are designed purlins. The stability of the structure is secured by roof braces and longitudinal braces. The hall is pin-supported on the foundation pad. The hall is clad wall and roof panels PUR. Main hall is equipped with a bridge crane with capacity of 8 tons.
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Пархоменко, Максим Вікторович, Максим Викторович Пархоменко, and Maksim Viktorovych Parkhomenko. "Метод кодування для підвищення бітової швидкості динамічного відеоресурсу в інформаційних системах." Thesis, Національний авіаційний університет, 2021. https://er.nau.edu.ua/handle/NAU/48933.
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У дисертаційній роботі вирішена актуальна науково-прикладна задача щодо підвищення бітової швидкості динамічного відеоресурсу в інформаційно-телекомунікаційних системах в процесі управління об’єктами критичної інфраструктури.
Виявлено проблемні недоліки існуючих концепцій побудови стандартизованих ІТОДВ. Проведено обґрунтування того, що для удосконалення ІТОДВ пропонується використовувати технологічний підхід, який базується на обробці послідовності кадрів ДВІР з використанням структурнокомбінаторного підходу, який враховує наявність значної кількості відповідної міжкадрової надмірності. Надаються основні складові побудови моделі оцінки інформативності структурно-комбінаторного представлення сукупностей позиційних координат фрейм-сплайнових тензорів послідовності передбачених кадрів в мультіадичному базисі. Викладається розробка методу динамічного кодування декомпонованих позиційних координат фреймсплайнового тензору послідовності В-Р кадрів на основі двополюсного змішаного мільтіадичного кодування в напрямку їх фреймів з врахуванням: виявлення структурних обмежень одночасного за двома напрямками відносно границь динамічних діапазонів. Надаються основні етапи створення технологічної концепції інтегрування методів обробки В-Р кадрів в інформаційну технологію обробки та передачі динамічних відео ресурсів.В диссертационной работе решена актуальная научно прикладная задача относительно повышения битовой скорости динамического видеоресурса в информационно-телекоммуникационных системах в процессе управления объектами критической инфраструктуры. Обоснованна важность применения концепции дистанционного видеоинформационного обеспечения с использованием стационарных и мобильных технологических платформ для систем управления объектами критической инфраструктуры. Показано, что в процессе информационного обеспечения систем управления объектами КИФ возникает противоречие между с одной стороны требованиями относительно качества предоставления динамических видеосервисов в дистанционном режиме, а с другой стороны ограниченными пропускными способностями современных беспроводных ИТКС. Обнаружены проблемные недостатки существующих концепций построения стандартизированных ИТОДВ. Проведено обоснование того, что для усовершенствования ИТОДВ предлагается использовать технологический подход, который базируется на обработке последовательности кадров ДВИР с использованием структурно-комбинаторного подхода, который учитывает наличие значительного количества соответствующей межкадровой избыточности. Утверждает необходимость представления последовательности предсказанных кадров в виде совокупности фрейм-сплайновых тензоров, которые состоят из динамической последовательности совокупности параметров структурных сплайнов спектрально-дифференцированных блоков. Изложены основные этапы создания структурно-комбинаторного подхода для кодирования динамической последовательности предсказанных кадров на основе представления совокупности позиционных координат фрейм-сплайновых тензоров в мультиадическом базисном пространстве. Предоставляются основные составляющие построения модели оценки информативности структурно-комбинаторного представления совокупности позиционных координат фрейм-сплайнових тензоров последовательности предсказанных кадров в мультиадическом базисе. Излагается разработка метода динамического кодирования декомпозиционных позиционных координат фрейм-сплайнового тензора последовательности В-Р кадров на основе двухполюсного смешанного мильтиадического кодирования в направлении их фреймов с учетом: выявление структурных ограничений одновременного по двум направлениям относительно границ динамических диапазонов. Предоставляются основные этапы создания технологической концепции интегрирования методов обработки В-Р кадров в информационную технологию обработки и передачи динамических видеоресурсов.
The importance of applying the concept of remote video information support using stationary and mobile technological platforms for the management systems of critical infrastructure objects is substantiated. It is shown that in the process of information provision of objects management systems KIF There is a contradiction between the following requirements for the quality of provision of dynamic video service in distance mode, and on the other hand, limited throughput capabilities of modern wireless ICS. The necessity of representing the sequence of predicted frames in the form of aggregates of frames-spline tensors, consisting of a dynamic sequence of aggregates of the parameters of structural splines of spectral-differentiated blocks, is argued. The main stages of creation of a structural-combinator approach for encoding the dynamic sequence of predicted personnel are described on the basis of representation of aggregates of positional coordinates of frame-plot tensors in multi layer base space. The main components of the construction of the model assessment of the structural-combinatorial representation of the positions of positional coordinates of the frame-plot of the sequence of predicted personnel in a multi layer space are provided. The development of the method of dynamic coding of decomposed positional coordinates of the glovial tensor of the sequence is described В-Р frames based on a two-pole mixed milthy encoding in the direction of their frames, taking into account: the detection of structural constraints simultaneously in two directions relative to the boundaries of dynamic ranges. The main stages of creation of the technological conception of integration of processing methods are taught В-P frames in information technology processing and transferring dynamic video resources.
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Sedláček, Jakub. "Nové brněnské hlavní nádraží a jeho veřejná prostranství." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-414285.
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The topic of the Diploma thesis is a design of the New train station in Brno. The plot is located on the boundary of three city districts – Komárov, Štýřice and Trnitá. This area includes the railway structure for the new train station and also its public spaces, which are very close to the river Svratka. The railway structure is designed as bridge construction, that rises all platforms and rail tracks to 7,65 metres above the ground level. So all of the railways do not become a barrier in the city. The main concept extends a longitudinal axis of the city boulevard through the train station, which creates a high-rise building in the southern part of the plot. This axis is written not only to the layout but also to the roof design. The train station includes two underground levels, ground floor and first floor. Underground levels consist of P+R parking, deliveries only area, technical facilities and subway terminal. The ground floor is the main traffic centre. There is an entrance hall, shopping area, bus terminal and public corridors. The first floor includes platforms for train departures and arrivals. There are also public spaces in the entrance hall. The basic structural system consists of two parts. The first part is a massive reinforced concrete structure of the railway bridge deck and all underground levels. This structure is based on reinforced concrete foundation pads with drilled piles. The second part is a steel frame structure of the roof. That includes steel columns and truss girders for the structure of the lower area. The higher part of the roof is designed as a steel-truss bridge with the characteristic profile. The new train station supposes to create a new gate to the city of Brno, that connects contemporary districts with the historical city center.
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Pellicioli, Laure. "Approche RMN de l'effet de réticulation : polymères téléchéliques calibrés (polypropylèneglycol), copolymères de polyéthylène." Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10298.
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Les differentes etapes de ce travail conduisent a une description quantitative des proprietes physiques des gels polymeres detectees par la technique de relaxation magnetique nucleaire. Des reseaux modeles formes de chaines telecheliques de polypropyleneglycol liees a des triisocyanates sont etudies pour relier precisement les mesures rmn aux caracteristiques physico-chimiques du gel. Les proprietes de la fonction de relaxation transversale d'un systeme gelifie revelent la structure interne du reseau polymere car la rmn detecte une longueur de correlation de mouvement, liee a la distance moyenne entre deux points de reticulation. En sondant le degre d'anisotropie du mouvement des unites monomeres, l'unite structurale - la maille du gel-responsable des proprietes de deformation du materiau (elasticite, gonflement. . . ) peut alors etre identifiee. De plus, une etude approfondie des proprietes pseudo-solides de la fonction de relaxation transversale permet de decorreler les deux contributions principales aux processus magnetiques de relaxation : la fonction dipolaire propre a la structure interne semi-locale du gel et la fonction mouvement qui, sensible aux fluctuations segmentaires des unites monomeres, depend largement de l'ecart entre les temperatures d'etude et de transition vitreuse du systeme. L'approche rnm sur les gels modeles est ensuite appliquee a des reseaux heterogenes presentant une bimodalite des longueurs de chaines entre points de reticulation, ou bien des chaines pendantes en concentration controlee. Les modifications induites par de telles heterogeneites sur les proprietes rmn sont analysees en terme de variation de volume (mobilite) et de densite de reticulation. Enfin cette technique rmn basse resolution couplee a la chromatographie en phase gazeuse permet de suivre et de controler la cinetique de reticulation de longues chaines copolymeres ethylene co acetate de vinyle et ethylene co acrylate de methyle.
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Deutschová, Martina. "Dům krátké cesty." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-354958.
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The subject of the diploma thesis is the architectural study of the mix-used urban housing situated closed to the Brno city centre. The design will allow mixing of greater amount of different functions on a relatively small built-up area, which will reduce the requirements on transport and provide the inhabitant with various forms of housing, services and employment. The mass and spatial solution respects the surrounding city blocks on south and the mass increase to the north industrial zone. The mass defines the area and respect noise protection zone on housing development. The shape of object's ground plan is based on the area, which is divided by four axes of pedestrian paths. The basic matter of object is divided into four blocks linked by common internal square. The mass solution provides private, semi-private and public courtyards.
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Šrubařová, Jana. "Dům krátké cesty v Brně." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226759.
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The territory is located in the city of Brno, district Trnitá on the embankment of the river Svitava. The subject of the diploma thesis is the architectural study of the design of the urban spatial structure with intensive use of city urban area, designed in pre-diploma project, which preceded diploma thesis. The design will allow mixing of greater amount of different functions on a relatively small built-up area, which will reduce the requirements on transport and provide the inhabitant with various forms of housing, services and employment. The shape of object's ground plan is based on area, which is connected from three sides to access roads. The mass and spatial solution respects the surrounding buildings and uses existing bike trails and sidewalks in the southeastern part of the area. The basic matter of object is divided by three axes passing through the building, into three blocks linked by common internal block. This creates a square with a tree-lined atrium with seating under the trees. The shape of these three blocks is further formed by removing of the mass, which results into forming of atriums, terraces and balconies, which brings natural light into the interior while allowing illumination of the patio and surrounding buildings within the territory. This spatial structure is horizontally divided by functions. Designed here are underground public garages, passages with shops, services, administration / commerce and housing. Despite the diversity of functions, for the facade was chosen a unified character of white horizontal lines contrasting with the dark gray lines of windows and facade cladding.
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Gebhardt, Tomáš. "Favorit Brno / cyklistický stadion - bikrosová dráha / - architektonická studie - design." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-399900.
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The thesis was preceded by a specialized atelierwork "architectural study of BMX track of the Favorit Brno. Further elaboration of the architectural and urban study of the sports complex in Komárov with the presumption of the dominant of the cycling hall. Evaluation of existing buildings and newly designed sports facilities. The diploma thesis deals with the development of a new concept of the area, where it will have its place for both professional and recreational sports. The aim of the proposal is to create a significant area both professional and recreational sport. The main part of the work is devoted to the design of o new cycling stadium owned but TJ Favoritisms Brno. The hall should have sufficient capacity and facilities to hold international sporting events in cycling. At the same time it should be useful for smaller races and other events. Another requirement is that the stadium can provide enough facilities for the TJ Favorit Brno cycling club. The home base is currently a cycling stadium at the Brno Exhibition Grounds. This stadium is currently inadequate, serving only as a training course. It does not meet conditions of the international Federation od UCI. The design of the variable space of the hall deserves a further attention at least, because it will serve athletics of other sporting events. The cycling stadium is located in the northern part of the grounds. It place emphasis on the scattered surfaces in the immediate vicinity of the stadium, easy orientation and layout of entries from all sides of the object, separation of athletes from spectators. The main expressive element is two masses, one of which allows the public to climb the ramp along the perimeter of the stadium to lookout points. From the ramp you can see the action inside the stadium. The attractiveness of the entire area is enhanced by the proposed traffic playground and bombrack. The total area will be separated from traffic. 3 new car parks will be built in the area.
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Krejčová, Zdenka. "Architektonická studie cyklistického stadionu /dráhy/ Favorit Brno /na volné ploše v Brně Komárově/." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-391859.
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Architectural study of the cycling studium/ runway / Favorit Brno / on the open space in. The urban problem of the present area is the poor technical condition of the buildings, the inadequate function of the buildings. The aim of the proposal is to create a significant area of both professional and recreational sport. The main part of the work is devoted to the design of a new cycling stadium owned by TJ Favorit Brno. The hall should have sufficient capacity and facilities to hold international sporting events in cycling and athletics. At the same time it should be useful for smaller races and other events. Another requirement is that the stadium can provide enough facilities for the TJ Favorit Brno cycling club. The home base is currently a cycling stadium at the Brno Exhibition Grounds. This stadium is currently inadequate, serving only as a training course. It does not meet the conditions of the International Federation of UCI. The design of the variable space of the hall deserves a further attention at least, beacuse it will serve athletics or other sporting events. The cycling stadium is located in the northern part of the grounds. It places emphasis on the scattered surfaces in the immediate vicinity of the stadium, easy orientation and layout of entries from all sides of the object, separation of athletes from spectators. The main expression element of the exterior is a glazed facade wall, with a perforated sheet metal. Providing night lighting and putting visitors into action. The attractiveness of the whole area is enhanced by the newly designed park. A café and relaxation areas are also proposed. The total area will be separated from traffic. Two parking spaces with sufficient capacity for the whole area will be created at its edge. Transport within the premises will only be accessible for service and operation.
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Macháčková, Eva. "Vícepodlažní dřevostavba." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226117.
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Master’s thesis deals with complete project documentation of newly built object of library and mediatheque located on the site in České Budějovice. It is a three-storey building divided into three parts, one-storey, two-storey and three-storey. It is partly basement. The underground part is devoted to main storage spaces of library services, management offices and social facilities for staff (toilets, changing rooms, washrooms). This part of the building has own entrance for employees. In the 1st floor is located the main library area along with exhibition spaces and the main entrance for visitors with self service cloakroom. In the 2nd floor are designed library spaces for visually impaired persons with fund of audio books, CDs and DVDs, a lecture hall with a projector and own kitchen and space for reading magazines and periodicals. From this floor is possible access to the outdoor terrace, which has own terrace furniture store nearby. In the 3rd floor is located a literary café with its own facilities. In each floor are also designed sanitary facilities for use by persons with limited ability of movement and orientation. All floors are connected by stairs and passenger lifts. In terms of construction, the building is designed as a frame, in the underground parts made of reinforced concrete, the overhead of glued laminated timber elements. The ceiling structure designed over the underground floor is monolithic reinforced concrete slab. The ceilings in the upper part are designed as a wooden beamed made of the glued laminated timber elements. The building has a pent roof created by wooden trusses assembled with punched metal plate fasteners. The foundations are designed as belts and footings. The study, detailed documentation, thermal-technical evaluation of selected structures and fire safety of the building are processed. For processing of the thesis were used software AutoCAD 2010, Teplo 2011, Area 2011, Ztráty 2011 and Fire NX 802 PRO.