Journal articles: 'Space frame structures'

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., Aniket N. Tolani. "ADVANTAGES OF TENSILE STRUCTURES OVER OTHER SPACE FRAME STRUCTURES." International Journal of Research in Engineering and Technology 05, no. 05 (May 25, 2016): 568–75. http://dx.doi.org/10.15623/ijret.2016.0505106.

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Soegiarso, R., and H. Adeli. "Optimization of Large Space Frame Steel Structures." Engineering Journal 34, no. 2 (June 30, 1997): 54–60. http://dx.doi.org/10.62913/engj.v34i2.681.

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Optimization of large space frame steel structures subjected to realistic code-specified stress, displacement, and buckling constraints is investigated. The basis of design is the American Institute of Steel Construction (AISC) Allowable Stress Design (ASD) specifications. The types of structures considered are space moment resisting frames with and without bracings. The structures are subjected to wind loadings according to the Uniform Building Code (UBC) in addition to dead and live loads. The parallel-vector algorithm developed in this research is applied to three highrise building structures ranging in size from a 20-story structure with 1,920 members to a 60-story structure with 5,760 members, and its parallel processing and vectorization performance is evaluated. For the largest structure, speedups of 6.4 and 17.8 are achieved due to parallel processing (using eight processors) and vectorization, respectively. When vectorization is combined with parallel processing a very significant speedup of 97.1 is achieved.

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Kwan, A. S. K., and S. Pellegrino. "A New Concept for Large Deployable Space Frames." International Journal of Space Structures 9, no. 3 (September 1994): 153–62. http://dx.doi.org/10.1177/026635119400900304.

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This paper proposes a new concept for space frames that can be automatically deployed and regidified. Two functionally separate types of sub-structures are considered: active sub-structures, able to deploy automatically and to retain their stiffness when fully deployed, and passive sub-structures, structural mechanisms that become stiff in the deployed state, and whose deployment kinematics match those of the active sub-structures. A design methodology for space frames based on the new concept is presented and illustrated by an example, a square plate-like space frame that can be deployed by a single motor. In this example both types of sub-structures consist of bars, connected together by simple pin-joints, and cable elements. Most cables go slack when the space frame is folded, but become taut when it is fully deployed. A state of self-stress is set up in the deployed state, thus imposing a state of pretension onto all cables.

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Meek, J. L., and S. Loganathan. "Large displacement analysis of space-frame structures." Computer Methods in Applied Mechanics and Engineering 72, no. 1 (January 1989): 57–75. http://dx.doi.org/10.1016/0045-7825(89)90121-7.

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Ferrer, Osmin, Arley Sierra, and José Sanabria. "Soft Frames in Soft Hilbert Spaces." Mathematics 9, no. 18 (September 14, 2021): 2249. http://dx.doi.org/10.3390/math9182249.

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In this paper, we use soft linear operators to introduce the notion of discrete frames on soft Hilbert spaces, which extends the classical notion of frames on Hilbert spaces to the context of algebraic structures on soft sets. Among other results, we show that the frame operator associated to a soft discrete frame is bounded, self-adjoint, invertible and with a bounded inverse. Furthermore, we prove that every element in a soft Hilbert space satisfies the frame decomposition theorem. This theoretical framework is potentially applicable in signal processing because the frame coefficients serve to model the data packets to be transmitted in communication networks.

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Lyu, Naesung, and Kazuhiro Saitou. "Decomposition-Based Assembly Synthesis of Space Frame Structures Using Joint Library." Journal of Mechanical Design 128, no. 1 (November 25, 2004): 57–65. http://dx.doi.org/10.1115/1.1909203.

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This paper presents a method for identifying the optimal designs of components and joints in the space frame body structures of passenger vehicles considering structural characteristics, manufacturability, and assembleability. Dissimilar to our previous work based on graph decomposition, the problem is posed as a simultaneous determination of the locations and types of joints in a structure and the cross sections of the joined structural frames, selected from a predefined joint library. The joint library is a set of joint designs containing the geometry of the feasible joints at each potential joint location and the cross sections of the joined frames, associated with their structural characteristics as equivalent torsional springs obtained from the finite element analyses of the detailed joint geometry. Structural characteristics of the entire structure are evaluated by finite element analyses of a beam-spring model constructed from the selected joints and joined frames. Manufacturability and assembleability are evaluated as the manufacturing and assembly costs estimated from the geometry of the components and joints, respectively. The optimization problem is solved by a multiobjective genetic algorithm using a direct crossover. A case study on an aluminum space frame of a midsize passenger vehicle is discussed.

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Meek, J. L., and S. Loganathan. "Geometrically non-linear behaviour of space frame structures." Computers & Structures 31, no. 1 (January 1989): 35–45. http://dx.doi.org/10.1016/0045-7949(89)90165-x.

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Fleischer, J., and J. Schaedel. "Joining automotive space frame structures by filament winding." CIRP Journal of Manufacturing Science and Technology 6, no. 2 (January 2013): 98–101. http://dx.doi.org/10.1016/j.cirpj.2013.02.003.

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Gao, Hui, Yuxi Wang, Xuhao Fan, Binzhang Jiao, Tingan Li, Chenglin Shang, Cheng Zeng, et al. "Dynamic 3D meta-holography in visible range with large frame number and high frame rate." Science Advances 6, no. 28 (July 2020): eaba8595. http://dx.doi.org/10.1126/sciadv.aba8595.

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The hologram is an ideal method for displaying three-dimensional images visible to the naked eye. Metasurfaces consisting of subwavelength structures show great potential in light field manipulation, which is useful for overcoming the drawbacks of common computer-generated holography. However, there are long-existing challenges to achieving dynamic meta-holography in the visible range, such as low frame rate and low frame number. In this work, we demonstrate a design of meta-holography that can achieve 228 different holographic frames and an extremely high frame rate (9523 frames per second) in the visible range. The design is based on a space channel metasurface and a high-speed dynamic structured laser beam modulation module. The space channel consists of silicon nitride nanopillars with a high modulation efficiency. This method can satisfy the needs of a holographic display and be useful in other applications, such as laser fabrication, optical storage, optics communications, and information processing.

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Storozhenko, Leonid, Dmytro Yermolenko, and Grygorii Gasii. "Investigation of the Deformation State of a Composite Cable Space Frame Structures with a Photogrammetric Method." International Journal of Engineering & Technology 7, no. 3.2 (June 20, 2018): 442. http://dx.doi.org/10.14419/ijet.v7i3.2.14568.

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The article presents experimental study results of the deformation state of composite cable space frame structures, including composite steel-concrete structures. Composite cable space frame structures are three-dimensional roof framing of long-span buildings. The designed constructions are a new type of roof framing structures and consist of typical composite steel-concrete modules connected with steel cable elements. The operation of composite cable space frame structures under load is characterised by geometric nonlinearity. The aim of the research is to study the deformation state and changing the geometric shape of experimental structures under the influence of external load. The technique of studying the deformation state of the composite cable space frame structures is based on the principles of digital photogrammetry. At the limit state the composite cable space frame structures change their regular shape. In this case, the central vertical points get the greatest vertical displacements, and the displacement value decreases closer to the supports. It is defined that the investigated construction has demonstrated combined action of all its components during the test, which indicates its effectiveness. The application of the photogrammetry method made possible to determine the moment of reaching the limit state of the composite cable space frame structures concretely.

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Satterwhite, R. G. "A Space-Frame as a Home." International Journal of Space Structures 6, no. 4 (December 1991): 297–301. http://dx.doi.org/10.1177/026635119100600407.

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Having studied space structures and the possibility of living within one, the author felt that it was important to actually design, fabricate and live in a space-frame house of his own design. The needs of his family provided the program and he provided the design, fabrication, and erection of a wooden space frame house in a remote part of Canada. A description of life in the structure is included together with a critique of this first experiment. A description of the need for the next experimental structure is given.

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UMEDA, Naoki, Fuminori HAYASHI, and Masatoshi SHIMODA. "J122035 Free-form Optimization Method for Space Frame Structures." Proceedings of Mechanical Engineering Congress, Japan 2012 (2012): _J122035–1—_J122035–5. http://dx.doi.org/10.1299/jsmemecj.2012._j122035-1.

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Liew, J. Y. Richard, H. Chen, N. E. Shanmugam, and W. F. Chen. "Improved nonlinear plastic hinge analysis of space frame structures." Engineering Structures 22, no. 10 (October 2000): 1324–38. http://dx.doi.org/10.1016/s0141-0296(99)00085-1.

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OHMORI, Hiroshi, and Kenji YAMAMOTO. "SHAPE OPTIMIZATION OF SPACE STRUCTURES FOR SPECIFIED STRESS DISTRIBUTION : Part 2 Application for space frame structures." Journal of Structural and Construction Engineering (Transactions of AIJ) 63, no. 503 (1998): 77–83. http://dx.doi.org/10.3130/aijs.63.77_1.

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Ivanchenko, Gryhoriy, Galyna Getun, Iryna Bezklubenko, and Andriy Solomin. "Features of design and calculations of complex reinforced concrete frames of buildings." Strength of Materials and Theory of Structures, no. 110 (June 26, 2023): 108–17. http://dx.doi.org/10.32347/2410-2547.2023.110.108-117.

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The article considers and systematizes the load-bearing structural systems of buildings with complex space-planning configurations, taking into account design solutions, structural loading and stress states. The features of the perception of loads and their rational distribution between the structural elements of frame buildings with complex space-planning solutions are analyzed. The main structural schemes of complex frames, schemes of their deformations and plots of moments under the influence of vertical and horizontal loads are introduced. The paper reflects the modern practice of preliminary approximate calculations of the approximate dimensions of the sections of frame structures of frame buildings for the possibility of further collecting loads and performing refined calculations using modern calculation software systems. The proposed method for modeling the nature of the work of complex frames of frame buildings and coordinating their space-planning, design and calculation systems will be useful for researchers, architects and design engineers during the design of new types of buildings, taking into account their operation under emergency conditions.

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Shareef, Sardar S., and Hozan L. Rauf. "The Influence of Building Structure on Human Perception in Interior Spaces." Journal of Studies in Science and Engineering 1, no. 1 (August 23, 2021): 1–10. http://dx.doi.org/10.53898/josse2021111.

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Structures create interior spaces. However, the sense of every space depends on the type of structure used. This paper tries to evaluate structural systems apply in architecture and then analyse space identity given by different structures. The method of this study mainly depends on a survey in the current literature and case study which the colour building in the department of architecture in EMU-North Cyprus has taken as the case study. Frame concrete (column and beam) is used in the building, which has made the interiors compacted in the structure's boundary. At the same time, inside spaces have some freedom as partition walls separate them. In this case, the structure proliferates visual focal points, corners and angles, to the main space. These visual definitions lately make the spaces to be more defined.

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Es-Haghi, Mohammad Sadegh, Alireza Salehi, and Alfred Strauss. "ENHANCED TEACHER-LEARNING BASED ALGORITHM IN REAL SIZE STRUCTURAL OPTIMIZATION." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 28, no. 4 (March 23, 2022): 292–304. http://dx.doi.org/10.3846/jcem.2022.16387.

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Space frame structures that are made up of a huge number of members are often used on a large scale, hence their accurate evaluation is important to achieve the optimal design. On the other hand, the use of space Frames and 3D truss structures has become more popular due to its time efficiency. Also, these types of structures can carry loads in longspan buildings and are used in large-scale structures such as halls, hangars, passenger stations, etc. In this study, a novel evolutionary algorithm, named ETLBO, has been proposed for the optimization of space frame design in real-size structures. Despite the existing methods in the literature, the ETLBO method can be used for large-scale space frame structures due to its high speed with sufficient accuracy. At first, four optimization algorithms Particle swarm optimization (PSO), Genetic Algorithm (GA), Differential Evolution (DE), and Teaching–learning-based optimization (TLBO) under structural problems have been evaluated. The results show that the TLBO algorithm performs better in solving problems and has been better in most problems than other algorithms. So, we have tried to improve this algorithm based on a machine learning approach and combination operators. Algorithm improvement is created by adding a crossover operation between the new solution and the best solution in the teacher phase. This change causes a sudden movement and escapes from the local minima for the algorithm. Enhanced algorithm results show that convergence speed and optimal response quality have improved. Finally, using this algorithm, several new practical examples have been optimized.

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Beutler, Patrick, Manuel Biedermann, Urs Hofmann, Ralph Rosenbauer, and Mirko Meboldt. "Automated Design Workflow for Structural Nodes of Space Frame Structures." Procedia CIRP 109 (2022): 419–24. http://dx.doi.org/10.1016/j.procir.2022.05.272.

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Spyrakos, Constantine C., and John Ermopoulos. "Development of aluminum load-carrying space frame for building structures." Engineering Structures 27, no. 13 (November 2005): 1942–50. http://dx.doi.org/10.1016/j.engstruct.2005.06.002.

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Ding, Yang, Min Wu, Long-He Xu, Hai-Tao Zhu, and Zhong-Xian Li. "Seismic damage evolution of steel–concrete hybrid space-frame structures." Engineering Structures 119 (July 2016): 1–12. http://dx.doi.org/10.1016/j.engstruct.2016.04.007.

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Klaus, Alexander, and Matthias Kleiner. "Research for a Flexible Production of Lightweight Space Frame Structures." Advanced Materials Research 10 (February 2006): 1–4. http://dx.doi.org/10.4028/www.scientific.net/amr.10.1.

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This paper presents the focus of research and the structure of the Collaborative Research Centre SFB/TR10 „Integration of Forming, Cutting, and Joining for the Flexible Production of Lightweight Structures” funded in 2003 by the German Research Foundation (DFG). Driven by the demands of low volume production. The aim of the Research Centre is to investigate the scientific basis and methods to design integrated process chains for the flexible manufacture of space frame structures.

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Xu, Fei-Hong, Zhao-Dong Xu, and Xiang-Cheng Zhang. "Study on the space frame structures incorporated with magnetorheological dampers." Smart Structures and Systems 19, no. 3 (March 25, 2017): 279–88. http://dx.doi.org/10.12989/sss.2017.19.3.279.

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Wang, Tie Cheng, Jian Kang, Zhi Ping Li, and Hai Long Zhao. "Research on Judging Key Components for Collapse of Space Structures." Applied Mechanics and Materials 166-169 (May 2012): 1459–64. http://dx.doi.org/10.4028/www.scientific.net/amm.166-169.1459.

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The key components of space steel frame structures which included 1-5 story respectively were judged by using energy method. It was shown in the results that besides interior and corner columns, adjacent side columns in low buildings should be paid attention to in analyzing progressive collapse. The approach of utilizing story as weight to modify importance factor of space frame structure was also proposed, and the modified importance factor complied better with collapse resistant characteristics of real buildings.

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Nadia ; Laurentia Carissa, Nathania. "EFFECTS OF IMPLEMENTING MODULAR CONTAINER STRUCTURE TOWARDS THE ROOM AND CORRIDOR QUALITY IN CHARA HOTEL." Riset Arsitektur (RISA) 3, no. 01 (February 7, 2019): 35–50. http://dx.doi.org/10.26593/risa.v3i01.3176.35-50.

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Abstract- Containers have a lifetime, so afterward abandoned. The use of used containers as buildings have grownand become popular in some countries. Containers have fixed length, width, and height. The use of containers asa hotel function requires adjustment of size and material. This research will analyze how far the fixed containerstructure is used in the Chara Hotel, adapters of fixed containers with the space requirements in them and theeffect of container material on human psychology.Research is reviewed in quantitative (size) and qualitative (psychological effects). The research will bedone by looking at how far the container structure is used in the building. Analysis of how closely the relationshipbetween the structure of the container and the rigid frame with the bedroom and corridor architecture is in termsof room size and space quality.The size of the container dimension can be put to good use as a function of the bedroom. Structuralcontainers and rigid frame structures are frame structures and architectural structures. The length and height ofthe corridor are good, the width of the corridor is less wide. The function of the space of the container structureand the rigid frame to space is good because the structure does not impede function and circulation.Key Words: container structure, rigid frame structure, space quantity, space quality

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Noorwali, Maha, Hamed H. Alsulami, and Erdal Karapınar. "Some Extensions of Fixed Point Results over Quasi-JS-Spaces." Journal of Function Spaces 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/6963041.

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We introduce the notion of quasi-JS-metric space. After defining the basic topological properties of quasi-JS-metric space, we investigate fixed point of certain mapping in the frame of complete quasi-JS-metric space. Our results unify and cover several existing fixed point theorems in distinct structures (such as standard quasi-metric spaces, quasi-b-metric spaces, dislocated quasi-metric spaces, and quasi-modular spaces) in the literature.

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Koronaki, Antiopi, Paul Shepherd, and Mark Evernden. "Fabrication-Aware Joint Clustering in Freeform Space-Frames." Buildings 13, no. 4 (April 4, 2023): 962. http://dx.doi.org/10.3390/buildings13040962.

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The geometrical variability in the joints of large-scale, doubly-curved space-frame structures can have a substantial impact on the time and cost of their construction. This paper proposes a novel framework to assess the construction complexity of space-frame structures as a factor of the geometrical variability and fabrication of their joints, to promote the informed design of the fabrication process. The k-means algorithm was used to cluster space-frame joints into fabrication batches, providing an overview of the variability distribution. A novel initialisation method was developed that allows the algorithm to adapt to project-specific inputs, substantially improving cluster compactness. Overlaying the clustering results with the properties of different fabrication processes provides an accurate estimation of the construction complexity of alternative fabrication options. The method was applied to a large-scale case study to demonstrate the benefits in practice. Alternative fabrication scenarios were assessed in the early stages of the design development, leading to the informed design of the fabrication process and hence to the efficient construction of large-scale, complex structures.

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Long, Xiao-Hong, Rong Yue, Yong-Tao Ma, and Jian Fan. "Finite Particle Method-Based Collapse Simulation of Space Steel Frame Subjected to Earthquake Excitation." Shock and Vibration 2018 (June 13, 2018): 1–19. http://dx.doi.org/10.1155/2018/1952050.

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In the process of collapse failure of the space steel frame subjected to earthquake excitation, complex behaviors often are involved, including geometric nonlinearity, material nonlinearity, fracture, contact, and collisions. In view of the unique advantages of the finite particle method to analyze complex structural nonlinear problems, this paper utilized the finite particle method as the basic means of analysis and used MATLAB software for computational analysis. This paper first derived a finite particle method-based space steel frame model, conducted static analysis and dynamic response analysis under earthquake excitation, and compared findings with ANSYS analysis results to validate reliability. This paper established the fracture criterion and failure mode of a steel frame member. Theoretical derivation and numerical simulation indicate that the finite particle method is a feasible and effective way to simulate the collapse of space steel frame structures subjected to earthquake excitation. This method provides a new approach to study the collapse and anticollapse seismic design of space steel frame structures subjected to earthquake excitation.

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Koronaki, Antiopi, Paul Shepherd, and Mark Evernden. "Rationalization of freeform space-frame structures: Reducing variability in the joints." International Journal of Architectural Computing 18, no. 1 (January 9, 2020): 84–99. http://dx.doi.org/10.1177/1478077119894881.

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In recent years, the application of space-frame structures on large-scale freeform designs has significantly increased due to their lightweight configuration and the freedom of design they offer. However, this has introduced a level of complexity into their construction, as doubly curved designs require non-uniform configurations. This article proposes a novel computational workflow that reduces the construction complexity of freeform space-frame structures, by minimizing variability in their joints. Space-frame joints are evaluated according to their geometry and clustered for production in compliance with the tolerance requirements of the selected fabrication process. This provides a direct insight into the level of customization required and the associated construction complexity. A subsequent geometry optimization of the space-frame’s depth minimizes the number of different joint groups required. The variables of the optimization are defined in relation to the structure’s curvature, providing a direct link between the structure’s geometry and the optimization process. Through the application of a control surface, the dimensionality of the design space is drastically reduced, rendering this method applicable to large-scale projects. A case study of an existing structure of complex geometry is presented, and this method achieves a significant reduction in the construction complexity in a robust and computationally efficient way.

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Friedman, Yona. "Space Frames and Span-over Buildings." International Journal of Space Structures 6, no. 4 (December 1991): 257–65. http://dx.doi.org/10.1177/026635119100600402.

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Space frame structures can be used both in industrial countries and in countries where labor is inexpensive. Such frameworks can be used as “containing structures” wherein the void between bars is converted into usable space. Frameworks containing usable spaces can span over large areas on the ground, also usable. “Spatial urbanism” thus consists of a rigid and airy framework forming patterns of easily transformable volumes. The framework is raised high above the ground and the ground itself is used for commercial, cultural and business, purposes, circulation, and green areas for which sunlight is provided by the gaps in the framework. The final townscape is arrived at through multiple decisions involving the population. This townscape is called “mobile architecture” and is the most democratic and convivial form of architecture possible.

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Fomin, V., and I. Fomina. "SPATIAL PROBLEMS OF DYNAMIC STABILITY OF FRAME STRUCTURES." Mechanics And Mathematical Methods 3, no. 2 (December 29, 2021): 40–51. http://dx.doi.org/10.31650/2618-0650-2021-3-2-40-51.

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Periodic longitudinal forces in structural elements caused by operational or seismic influences, at certain values of the parameters of these forces can cause the occurrence and growing of transverse oscillations of these elements. This phenomenon is called parametric resonance or loss of dynamic stability. In the works of N. M. Belyaev, N. M. Krylov, М. М. Bogolyubov, E. Mettler, V. N. Chelomey, V. V. Bolotin flat problems of dynamic stability of frame structures were investigated. In this paper the modified Bolotin’s method, proposed to solve flat problems of dynamic stability of frames, is used. Instead of the deformation method used by V. V. Bolotin to construct analytical expressions of deflections of frame rods, in the modified method the numerical-analytical method of boundary elements is used. The article proposes a method for constructing domains of dynamic instability of frames in the space of parameters (frequency and amplitude) of seismic and operational dynamic influences that cause longitudinal forces in the rods, which periodically change over time and lead to unlimited growth of transverse oscillations amplitudes in the domains of instability. The proposed method is demonstrated in example, which considers the spatial problem of dynamic stability of a П-shaped frame with two concentrated masses located on it, which are under the action of vertical periodic forces. These forces create periodic longitudinal forces in the vertical rods of the frame. Areas of dynamic instability of the frame were constructed. Taking into account the destructive effect of oscillations is important for practical application. The most dangerous destructive effect of oscillations is observed in earthquakes and explosions. The study of this action makes it possible to avoid undesirable consequences of oscillations by limiting their level and to solve important practical problems of the dynamics of structures. Solving dynamics problems is a difficult problem. Dynamic calculation of structures provides their bearing capacity under the combined action of static and dynamic loads.

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Qi, Nian, and Ji Hong Ye. "Nonlinear Dynamic Analysis of Space Frame Structures by Discrete Element Method." Applied Mechanics and Materials 638-640 (September 2014): 1716–19. http://dx.doi.org/10.4028/www.scientific.net/amm.638-640.1716.

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This document explores the possibility of the discrete element method (DEM) being applied in nonlinear dynamic analysis of space frame structures. The method models the analyzed object to be composed by finite particles and the Newton’s second law is applied to describe each particle’s motion. The parallel-bond model is adopted during the calculation of internal force and moment arising from the deformation. The procedure of analysis is vastly simple, accurate and versatile. Numerical examples are given to demonstrate the accuracy and applicability of this method in handling the large deflection and dynamic behaviour of space frame structures. Besides, the method does not need to form stiffness matrix or iterations, so it is more advantageous than traditional nonlinear finite element method.

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Al-Salman, Harith, and Haitham H. Muteb. "Performance Evaluation of Mero Jointed Composite UHPC Composite Space Frame Structures." Journal of Physics: Conference Series 1895, no. 1 (May 1, 2021): 012056. http://dx.doi.org/10.1088/1742-6596/1895/1/012056.

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Hou, Rongrong, James L. Beck, Xiaoqing Zhou, and Yong Xia. "Structural damage detection of space frame structures with semi-rigid connections." Engineering Structures 235 (May 2021): 112029. http://dx.doi.org/10.1016/j.engstruct.2021.112029.

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Soegiarso, R., and H. Adeli. "Optimum Load and Resistance Factor Design of Steel Space-Frame Structures." Journal of Structural Engineering 123, no. 2 (February 1997): 184–92. http://dx.doi.org/10.1061/(asce)0733-9445(1997)123:2(184).

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MORIMOTO, Takashi, and Masatoshi SHIMODA. "Shape optimization of space frame structures for maximizing a natural frequency." Transactions of the JSME (in Japanese) 80, no. 809 (2014): DR0015. http://dx.doi.org/10.1299/transjsme.2014dr0015.

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Qian, Jiaru, Xiaodong Ji, and Youlin Xu. "Two-stage damage diagnosis approach for steel braced space frame structures." Engineering Structures 29, no. 12 (December 2007): 3277–92. http://dx.doi.org/10.1016/j.engstruct.2007.09.011.

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Luo, Jian. "Multimedia Big Data Frame Combination Storage Strategy Based on Virtual Space Distortion." International Journal of Online Engineering (iJOE) 13, no. 02 (February 27, 2017): 119. http://dx.doi.org/10.3991/ijoe.v13i02.6611.

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<p>Aiming at the transmission reliability and storage management of multimedia data, the multimedia big data frame combination storage strategy is proposed based on the virtual space distortion analysis model. On the one hand, the virtual space distortion analysis model is established. This model can be used to find the high similarity of video frames and flow structures in different multimedia streams. The model can be used to uniform the multimedia stream state and effectively improve the efficiency of data mining. The model can effectively analyze the difference between the multimedia stream of virtual space and the storage of the server group. On the other hand, based on the distorted efforts of the virtual space and heterogeneous of the multimedia data stream, combined with big data multimedia service requirements, the big data frame combination of storage space and virtual space integration would be integrated as a whole through the multimedia data frame combination and distorted perception. Finally, the combination of multimedia data frames is proposed. The delay, channel, storage and big data processing level of the virtual space storage scheme and were analyzed and evaluated by the simulation experiment, compared with the physical storage scheme of the multimedia big data. The experimental results show that the proposed scheme has significant advantages in the above aspects.</p>

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Vörös, László. "Structures in the space of Platonic and Archimedean solids." SAJ - Serbian Architectural Journal 3, no. 3 (2011): 140–51. http://dx.doi.org/10.5937/saj1102140v.

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This paper gives a classification of Platonic and Archimedean solids related to more-dimensional cubes. A general infinite net structure for space-filling mosaics created from the above solids has been derived and the node elements for grid structures based on our groups of solids have been described within the frame of constructive geometry. The topic is related to arts and design and raises further geometrical questions.

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Pichugin, S. F., V. P. Chichulin, and K. V. Chichulina. "SPATIAL STRUCTURES OF CLOSED PROFILES." ACADEMIC JOURNAL Series: Industrial Machine Building, Civil Engineering 1, no. 48 (March 27, 2017): 138–43. http://dx.doi.org/10.26906/znp.2017.48.787.

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The article presents a new design of steel space trusses, arches, frames of complex application, the main advantages of which are lightness, durability of plane, cost efficiency, reliability, reduction of construction period and investment cycle, energy savings at manufacture, transportation and construction. Based on the previously performed experimental and theoretic studies, the expediency of using box-shaped section parallel chord trusses has been proved. Therefore, new constructive decisions for light efficient trusses, arches, frames that can be used at erection of civil and industrial objects are presented below. The suggested efficient structure of a steel truss with spatial upper chord, using tubes or rectangular hollow box-shaped sections, steel trifurcate spatial truss construction, spatial arch truss, spatial arch. Considered the use of closed cross-sections for spatial arch elements. It has been revealed that using the two-hinges spatial frame the construction cost of a building can be reduced due to reducing of the basement’s dimensions.

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Ali, Barham H., Brwa A. Saeed, and Twana A. Hussein. "Time History Analysis of Frame Structure Systems by State-space Representation Method." Polytechnic Journal 10, no. 1 (June 30, 2020): 140–47. http://dx.doi.org/10.25156/ptj.v10n1y2020.pp140-147.

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This paper develops the state-space representation (SSR) in the field of seismic analysis of the building structures. Dynamic analysis of multi-degree-of-freedom structures involves the solution of second-order linear differential equations which they represent the equation of motion of the structure. In this paper, a SSR was formulated to replace differential equation with two coupled first-order linear differential equations. The objectives of this study are as follows: (i) To implement the SSR as a powerful tool in dynamic analysis of frame structures and (ii) to conduct a linear time history analysis for large structures subjected to ground acceleration and the seismic responses of the building were studied as well. The analysis was based on the assumption that the system is elastic linear time-invariant system and material nonlinearity is not considered. The 1940 El-Centro earthquake time history record has been used in the study. There are many effective traditional methods which can be used for carrying out linear dynamic analysis of the structures, however, this paper introduces a state-space model as an alternative approach to perform this analysis. The advantage of this method, it works properly with MATLAB software, gives explicit result for time-invariant systems, applied to multi-input and multi-output control systems, solve the equation of motion for complicated dynamic problems.

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Lyu, Naesung, Byungwoo Lee, and Kazuhiro Saitou. "Optimal Subassembly Partitioning of Space Frame Structures for In-Process Dimensional Adjustability and Stiffness." Journal of Mechanical Design 128, no. 3 (August 11, 2005): 527–35. http://dx.doi.org/10.1115/1.2181599.

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A method for optimally synthesizing multicomponent structural assemblies of an aluminum space frame (ASF) vehicle body is presented, which simultaneously considers structural stiffness, manufacturing and assembly costs and dimensional integrity under a unified framework based on joint libraries. The optimization problem is posed as a simultaneous determination of the location and feasible types of joints in a structure selected from the predefined joint libraries, combined with the size optimization for the cross sections of the joined structural frames. The structural stiffness is evaluated by finite element analyses of a beam-spring model modeling the joints and joined frames. Manufacturing and assembly costs are estimated based on the geometries of the components and joints. Dissimilar to the enumerative approach in our previous work, dimensional integrity of a candidate assembly is evaluated as the adjustability of the given critical dimensions, using an internal optimization routine that finds the optimal subassembly partitioning of an assembly for in-process adjustability. The optimization problem is solved by a multiobjective genetic algorithm. An example on an ASF of the midsize passenger vehicle is presented, where the representative designs in the Pareto set are examined with respect to the three design objectives.

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Alkalaev, Konstantin, and Maxim Grigoriev. "Frame-like Lagrangians and presymplectic AKSZ-type sigma models." International Journal of Modern Physics A 29, no. 18 (July 15, 2014): 1450103. http://dx.doi.org/10.1142/s0217751x14501036.

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We study supergeometric structures underlying frame-like Lagrangians. We show that for the theory in n space–time dimensions both the frame-like Lagrangian and its gauge symmetries are encoded in the target supermanifold equipped with the odd vector field, the closed two-form of ghost degree n-1, and the scalar potential of ghost degree n. These structures satisfy a set of compatibility conditions ensuring the gauge invariance of the theory. The Lagrangian and the gauge symmetries have the same structures as those of AKSZ sigma model so that frame-like formulation can be seen as its presymplectic generalization. In contrast to the conventional AKSZ model, the generalization allows to describe systems with local degrees of freedom in terms of finite-dimensional target space. We argue that the proposed frame-like approach is directly related de Donder–Weyl polymomentum Hamiltonian formalism. Along with the standard field-theoretical examples like Einstein–Yang–Mills theory, we consider free higher spin fields, multi-frame gravity and parametrized systems. In particular, we propose the frame-like action for free totally symmetric massless fields that involves all higher spin connections on an equal footing.

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Li, Dongsheng, Jiepeng Liu, Yan Zeng, Guozhong Cheng, Biqin Dong, and Y. Frank Chen. "3D model-based scan planning for space frame structures considering site conditions." Automation in Construction 140 (August 2022): 104363. http://dx.doi.org/10.1016/j.autcon.2022.104363.

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Abdelal, Gasser F., Jonathan E. Cooper, and Antony J. Robotham. "Reliability assessment of 3D space frame structures applying stochastic finite element analysis." International Journal of Mechanics and Materials in Design 9, no. 1 (August 11, 2011): 1–9. http://dx.doi.org/10.1007/s10999-011-9168-0.

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Wang, Lian Kun. "Advanced Inelastic Analysis of Frame Structures Considering Shearing and Warping Deformations." Advanced Materials Research 255-260 (May 2011): 268–73. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.268.

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The paper addresses the derivation of a concentrated plastic-hinge finite element modelling for nonlinear analysis of space steel frames. The interpolation functions considering shearing deformation are adopted and cubic polynomial interpolation functions based on Kollbrnner-Dajdin modified constraint torsion theory are used to consider the warping deformation, with these functions the effect of the secondary shear stress can be taken into account. With the expanded Orbison’s yielding surface, the plastic-hinge method used to do nonlinear analysis of space steel frames is derived by introducing elastic-plastic hinge parameter of element cross section. Numerical examples are presented to illustrate the validity and the universality of the proposed approach and the results show the new model is accurate and suitable for the nonlinear analysis of steel frameworks.

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Duque Estrada, Rebeca, Fabian Kannenberg, Hans Jakob Wagner, Maria Yablonina, and Achim Menges. "Spatial winding: cooperative heterogeneous multi-robot system for fibrous structures." Construction Robotics 4, no. 3-4 (September 21, 2020): 205–15. http://dx.doi.org/10.1007/s41693-020-00036-7.

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AbstractThis research presents a cooperative heterogeneous multi-robot fabrication system for the spatial winding of filament materials. The system is based on the cooperation of a six-axis robotic arm and a customized 2 + 2 axis CNC gantry system. Heterogeneous multi-robot cooperation allows to deploy the strategy of Spatial Winding: a new method of sequential spatial fiber arrangement, based on directly interlocking filament-filament connections, achieved through wrapping one filament around another. This strategy allows to create lightweight non-regular fibrous space frame structures. The new material system was explored through physical models and digital simulations prior to deployment with the proposed robotic fabrication process. An adaptable frame setup was developed which allows the fabrication of a variety of geometries within the same frame. By introducing a multi-step curing process that integrates with the adaptable frame, the iterative production of continuous large-scale spatial frame structures is possible. This makes the structure’s scale agnostic of robotic reach and reduces the necessary formwork to the bare minimum. Through leveraging the capacities of two cooperating machines, the system allows to counteract some of their limitations. A flexible, dynamic and collaborative fabrication system is presented as a strategy to tailor the fiber in space and expand the design possibilities of lightweight fiber structures. The artifact of the proposed fabrication process is a direct expression of the material tectonics and the robotic fabrication system.

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Wu, Jin-Liang, Jun-Jie Shi, and Lei Zhang. "Rectangling irregular videos by optimal spatio-temporal warping." Computational Visual Media 8, no. 1 (October 27, 2021): 93–103. http://dx.doi.org/10.1007/s41095-021-0222-z.

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AbstractImage and video processing based on geometric principles typically changes the rectangular shape of video frames to an irregular shape. This paper presents a warping based approach for rectangling such irregular frame boundaries in space and time, i.e., making them rectangular again. To reduce geometric distortion in the rectangling process, we employ content-preserving deformation of a mesh grid with line structures as constraints to warp the frames. To conform to the original inter-frame motion, we keep feature trajectory distribution as constraints during motion compensation to ensure stability after warping the frames. Such spatially and temporally optimized warps enable the output of regular rectangular boundaries for the video frames with low geometric distortion and jitter. Our experiments demonstrate that our approach can generate plausible video rectangling results in a variety of applications.

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Wu, Ke, Houfei Fang, and Bingen Yang. "Modeling, Analyses, and Optimization of Planar Active Frame Structures Composed of Piezoelectric Beams." International Journal of Structural Stability and Dynamics 19, no. 12 (December 2019): 1950146. http://dx.doi.org/10.1142/s0219455419501463.

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Frame structures are widely used in engineering applications, especially in space structures. For special use such as shape and vibration control of such structures, piezoelectric patches are usually placed on the beam surfaces to form active frame structures. To perform shape control or vibration control tasks, modeling methods for the formed active frame structures need to be studied. This paper develops a new distributed model of an active frame structure composed of multilayer piezoelectric beam components. First, the governing equations of a beam, bonded with piezoelectric patches, are developed via the generalized Hamilton principle, by considering the transverse shear strain. Then, the analytical solutions of the governing equations and the generalized element stiffness matrix are derived through the distributed transfer function formulation. Finally, the analytical solution of the entire system is obtained by the technique for assembling element stiffness matrix. In numerical simulations, buckling and vibration of an active frame structure are both studied. In addition, a novel Improved Ant Lion algorithm is proposed for optimal design of the frame structures. The optimization examples confirm that the proposed algorithm is more efficient than other existing popular algorithms such as Genetic Algorithm (GA) and Ant Lion Optimization (ALO) algorithm.

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Zimin, Vladimir, Alexey Krylov, Sergey Churilin, and Zikun Zhang. "Mathematical modeling of transformable space structure dynamics." EPJ Web of Conferences 221 (2019): 01018. http://dx.doi.org/10.1051/epjconf/201922101018.

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Today large space structures are in focus of attention of engineers and designers of rocket and space equipment. In ground-based experiments, it is not always possible to carry out complex tests of large space structure functionality. Therefore, the development of mathematical models describing properly the transformable structure dynamics when they opened from the densely packed transport state to the operating position in the orbit becomes very important. To determine the stress-strain state of the frame elements when it is unfolding the shape of the framework is taken at the moments when relative velocities of the adjacent sections are maximal. Supposed, that at these moments the frame elements are getting on the stops limiting their relative angular displacements, and the structure behaves as an elastic rod with specified characteristics. Numerical analysis of the stress-strain state in the framework is carried out by means of a finite element model. Therefore, the represented mathematical model can be effectively used to predict the functional suitability of such transformable space structures already on the early stages of their development.

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Trushchov, A. G., and G. P. Ivanov. "The Use of Pneumatic Rings and Spirals in Space Structures and Framework Systems." International Journal of Space Structures 9, no. 4 (December 1994): 211–17. http://dx.doi.org/10.1177/026635119400900404.

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The paper discusses the results of research in forming fast erecting pneumatic framework structures with the use of pneumatic rings and spirals. We investigate the description of structures, methods of erecting and dismantling, working features and applying such pneumatic structures as covering with opening ends, wavy vault with transformable semiarches, elastic volume supported by pneumatic pillars, flexible sheathing with pneumatic supporting frame for vault coverings, sheathing for column concreting, elastic funnelled volume, device for assembling rigid building structures. Description of pneumatic structures is illustrated by explanatory schemes and figures.

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Journal articles on the topic 'Space frame structures'

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