Готові списки джерел за темами / Forced structure

Добірка наукової літератури з теми "Forced structure"

Автор: Grafiati
Опубліковано: 19 червня 2021
Оновлено: 8 лютого 2022

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями

Оберіть тип джерела:

Ознайомтеся зі списками актуальних статей, книг, дисертацій, тез та інших наукових джерел на тему "Forced structure".

Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.

Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.

Зміст

  1. Статті в журналах
  2. Дисертації
  3. Книги
  4. Частини книг
  5. Тези доповідей конференцій
  6. Звіти організацій

Статті в журналах з теми "Forced structure":

1

Tho, Nguyen Chi, Nguyen Tri Ta, and Do Van Thom. "New Numerical Results from Simulations of Beams and Space Frame Systems with a Tuned Mass Damper." Materials 12, no. 8 (April 23, 2019): 1329. http://dx.doi.org/10.3390/ma12081329.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
In working processes, mechanical systems are often affected by both internal and external forces, which are the cause of the forced vibrations of the structures. They can be destroyed if the amplitude of vibration reaches a high enough value. One of the most popular ways to reduce these forced vibrations is to attach tuned mass damper (TMD) devices, which are commonly added at the maximum displacement point of the structures. This paper presents the computed results of the free vibration and the vibration response of the space frame system under an external random load, which is described as a stationary process with white noise. Static and dynamic equations are formed through the finite element method. In addition, this work also establishes artificial neural networks (ANNs) in order to predict the vibration response of the first frequencies of the structure. Numerical studies show that the data set of the TMD device strongly affects the first frequencies of the mechanical system, and the proposed artificial intelligence (AI) model can predict exactly the vibration response of the first frequencies of the structure. For the forced vibration problem, we can find optimal parameters of the TMD device and thus obtain minimum displacements of the structure. The results of this work can be used as a reference when applying this type of structure to TMD devices.
2

Gu, Keqin, and Benson H. Tongue. "A Method to Improve the Modal Convergence for Structures With External Forcing." Journal of Applied Mechanics 54, no. 4 (December 1, 1987): 904–9. http://dx.doi.org/10.1115/1.3173137.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
The traditional approach of using free vibration modes in the assumed mode method often leads to an extremely slow convergence rate, especially when discete interactive forces are involved. By introducing a number of forced modes, significant improvements can be achieved. These forced modes are intrinsic to the structure and the spatial distribution of forces. The motion of the structure can be described exactly by these forced modes and a few free vibration modes provided that certain conditions are satisfied. The forced modes can be viewed as an extension of static modes. The development of a forced mode formulation is outlined and a numerical example is presented.
3

Hiesgen, Renate, Tobias Morawietz, Michael Handl, and K. Andreas Friedrich. "Structure and conductivity of fuel cell membranes and catalytic layers investigated by AFM." MRS Proceedings 1774 (2015): 19–24. http://dx.doi.org/10.1557/opl.2015.725.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
ABSTRACTIn this work, the structure and conductive structure of perfluorinated sulfonated ionomers were investigated by tapping mode, material sensitive atomic force microscopy (AFM). At cross section of membranes, large ordered lamellar-like areas were found. From adhesion force mappings, approximately 50 nm large water-rich areas could be identified by their low adhesion. These areas were interpreted as ionically conductive phase. They appeared circular and isolated before any forced current flow through the sample (activation). After activation, branched, long and flat ionically conductive phase structures in direction of applied voltage were found. They were interpreted as the formation of a continuous ionically conducting network formed by the current flow. In a second part, the material sensitive imaging was used to analyze the distribution of ionomer and platinum covered carbon particles in fuel cell electrodes. The analysis was based on the high adhesion of ionomers compared to the carbon supported catalyst particles.
4

Paulson, T. J., and D. P. Abrams. "Correlation between Static and Dynamic Response of Model Masonry Structures." Earthquake Spectra 6, no. 3 (August 1990): 573–91. http://dx.doi.org/10.1193/1.1585587.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
The paper presents correlations between response of the same structural system subjected to either dynamic shaking or static lateral forces. Two one-quarter scale test structures were constructed with identical designs and were tested in the laboratory using two different methods. The first structure was subjected to simulated earthquake motions on a shaking table while the second structure was forced to displace through the same history at static rates using computer controlled servohydraulic actuators. Characteristics of dynamic lateral force distributions are examined first and followed by a description of techniques used for the static loading experiment. Correlations are made between observed response of the statically and dynamically tested twin structures to suggest differences in strength, stiffness and energy dissipation that may arise with each test method.
5

Musaeva, D. A., Egbert Baake, and V. K. Ilin. "Experimental Investigation of Al-Alloy Directional Solidification in Pulsed Electromagnetic Field." Materials Science Forum 870 (September 2016): 471–76. http://dx.doi.org/10.4028/www.scientific.net/msf.870.471.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
The paper considers the influence of low-frequency pulsed force of an electromagnetic field on the formation of a solidifying metal structure, investigated experimentally. Pulses in the range from 0.1 to 10 Hz were applied to the melt, during the ingots growth in the cylindrical volume, to create the conditions of the forced convection. The final metal structure and deformation of the samples free surface, solidified in different conditions was analyzed. The reduction of porosity in metal ingots was stated for the cases of forced convection under the pulsed frequencies from 0.1 to 1 Hz, in comparison to the structure, formed by permanent electromagnetic stirring. The specimens, grown under the pulsed forcing with equal time of the pulses and the pauses have concave free surface, as well as in the cases of natural convection and permanent stirring. A flatter form of the free surface was obtained during the solidification process under the short pulses of electromagnetic force. Intorduction
6

Parks, Helen, and Melvin Leok. "Constructing equivalence-preserving Dirac variational integrators with forces." IMA Journal of Numerical Analysis 39, no. 4 (August 15, 2018): 1706–26. http://dx.doi.org/10.1093/imanum/dry053.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Abstract The dynamical motion of mechanical systems possesses underlying geometric structures and preserving these structures in numerical integration improves the qualitative accuracy and reduces the long-time error of the simulation. For a single mechanical system, structure preservation can be achieved by adopting the variational integrator construction (Marsden, J. & West, M. (2001) Discrete mechanics and variational integrators. Acta Numer., 10, 357–514). This construction has been generalized to more complex systems involving forces or constraints as well as to the setting of Dirac mechanics (Leok, M. & Ohsawa, T. (2011) Variational and geometric structures of discrete Dirac measures. Found. Comput. Math., 11, 529–562). Forced Lagrange–Dirac systems are described by a Lagrangian and an external force pair, and two pairs of Lagrangians and external forces are said to be equivalent if they yield the same equations of motion. However, the variational discretization of a forced Lagrange–Dirac system discretizes the Lagrangian and forces separately, and will generally depend on the choice of representation. In this paper we derive a class of Dirac variational integrators with forces that yield well-defined numerical methods that are independent of the choice of representation. We present a numerical simulation to demonstrate how such equivalence-preserving discretizations avoid spurious solutions that otherwise arise from poorly chosen representations.
7

McMeans, Bailey C., Kevin S. McCann, Murray Humphries, Neil Rooney, and Aaron T. Fisk. "Food Web Structure in Temporally-Forced Ecosystems." Trends in Ecology & Evolution 30, no. 11 (November 2015): 662–72. http://dx.doi.org/10.1016/j.tree.2015.09.001.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
8

Liu, Amy Y., and David J. Singh. "bcc cobalt: Metastable phase or forced structure?" Journal of Applied Physics 73, no. 10 (May 15, 1993): 6189–91. http://dx.doi.org/10.1063/1.352693.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
9

Muravyov, A. "FORCED VIBRATION RESPONSES OF A VISCOELASTIC STRUCTURE." Journal of Sound and Vibration 218, no. 5 (December 1998): 892–907. http://dx.doi.org/10.1006/jsvi.1998.1819.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
10

JI, XU, and ERKAN OTERKUS. "Physical mechanism of ice/structure interaction." Journal of Glaciology 64, no. 244 (February 28, 2018): 197–207. http://dx.doi.org/10.1017/jog.2018.5.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
ABSTRACTTo obtain the effect of velocity and structural natural frequency (structural stiffness) on ice failure, an extended dynamic Van der Pol-based single degree-of-freedom ice/structure interaction model is developed. Three basic modes of response were reproduced: intermittent crushing, frequency lock-in and continuous crushing. Further analysis on the physical mechanism of ice/structure interaction is presented on the basis of feedback mechanism and energy mechanism, respectively. Internal effect and external effect from ice and structure were both explained in the feedback branch. Based on reproduced results, energy exchanges at different configurations are computed from the energy conservation using the first law of thermodynamics. A general conclusion on the predominant type of vibration when the ice velocity increases during the interaction process is forced, self-excited and forced in each of the three modes of responses. Ice force variations also show that there is more impulse energy during the lock-in range. Moreover, ice-induced vibration demonstrates an analogy of friction-induced self-excited vibration. Finally, the similarity between strain-stress curve and Stribeck curve shows that static and kinetic friction force variations are attributed to ice force characteristic, and can be used to explain the lower effective pressure magnitude during continuous crushing than the peak pressure during intermittent crushing.
Більше джерел
Також вас можуть зацікавити розширені добірки на тему "Forced structure" для конкретних типів джерел:
Статті в журналах Дисертації Книги

Дисертації з теми "Forced structure":

1

Söderberg, Stefan. "Mesoscale dynamics and boundary-layer structure in topographically forced low-level jets." Doctoral thesis, Stockholm University, Department of Meteorology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-63.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:

Two types of mesoscale wind-speed jet and their effects on boundary-layer structure were studied. The first is a coastal jet off the northern California coast, and the second is a katabatic jet over Vatnajökull, Iceland. Coastal regions are highly populated, and studies of coastal meteorology are of general interest for environmental protection, fishing industry, and for air and sea transportation. Not so many people live in direct contact with glaciers but properties of katabatic flows are important for understanding glacier response to climatic changes. Hence, the two jets can potentially influence a vast number of people.

Flow response to terrain forcing, transient behavior in time and space, and adherence to simplified theoretical models were examined. The turbulence structure in these stably stratified boundary layers was also investigated. Numerical modeling is the main tool in this thesis; observations are used primarily to ensure a realistic model behavior.

Simple shallow-water theory provides a useful framework for analyzing high-velocity flows along mountainous coastlines, but for an unexpected reason. Waves are trapped in the inversion by the curvature of the wind-speed profile, rather than by an infinite stability in the inversion separating two neutral layers, as assumed in the theory. In the absence of blocking terrain, observations of steady-state supercritical flows are not likely, due to the diurnal variation of flow criticality.

In many simplified models, non-local processes are neglected. In the flows studied here, we showed that this is not always a valid approximation. Discrepancies between simulated katabatic flow and that predicted by an analytical model are hypothesized to be due to non-local effects, such as surface inhomogeneity and slope geometry, neglected in the theory. On a different scale, a reason for variations in the shape of local similarity scaling functions between studies is suggested to be differences in non-local contributions to the velocity variance budgets.

2

Söderberg, Stefan. "Mesoscale dynamics and boundary-layer structure in topographically forced low-level jets /." Stockholm : Meteorologiska institutionen, Univ, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-63.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Lu, Ya Nan. "Static and forced vibration analysis of plane truss structure with geometrical nonlinearity." Thesis, University of Macau, 2015. http://umaclib3.umac.mo/record=b3335487.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
4

Moyroud, François. "Fluid-structure integrated computational methods for turbomachinery blade flutter and forced response predictions /." Stockholm : Tekniska högsk, 1998. http://www.lib.kth.se/abs98/moyr1214.pdf.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
5

Moyroud, François. "Fluid-structure integrated computational methods for turbomachinery blade flutter and forced response predictions." Lyon, INSA, 1998. http://www.theses.fr/1998ISAL0101.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Les ensembles disque-aubes des turbomachines modernes sont amenés à satisfaire des critères stricts en termes de stabilité aéroélastique et de réponse forcée. L'objectif de cette thèse est d'utiliser et de développer des techniques de modélisation, capables de prédire le phénomène de flottement et de quantifier les amplitudes de résonance des aubages de turbomachine. Pour le flottement, deux méthodes d'analyse aéroélastique sont considérées: la méthode énergétique (approche fluidestructure non-couplée) et le schéma de couplage modal (approche fluide-structure couplée). Ces modèles ont été installés dans le code de calcul STRUFLO qui offre des outils d'interface performants pour coupler divers codes de calcul. Des méthodes spécifiques sont utilisées afin de combiner plusieurs types d'analyses fluide et structure, et ainsi de progresser dans le sens d'un traitement général des interactions fluide-structure. A cet effet, le schéma de couplage modal est adapté pour être compatible avec des analyses modales d'aube seule ainsi que des analyses modales d'ensemble disque-aubes avec ou sans symétrie cyclique. Un maillage d'interface est utilisé pour résoudre les problèmes liés à l'incompatibilité des maillages fluide et structure à l'interface et une méthode d'interpolation/extrapolation permet de transférer les modes de vibration d'aube et les champs de pression instationnaire, du maillage structure au maillage aérodynamique et vice versa. Le désaccordage structure est l'une des caractéristiques pouvant considérablement modifier la stabilité aéroélastique et les amplitudes de résonance des aubages. A cet effet, deux méthodes de réduction ont été étudiées afin d'autoriser des analyses modales et de réponse forcée d'ensemble disque-aubes complet. Les techniques développées sont appliquées à l'étude des comportements dynamiques, aérodynamiques et aéroélastiques du fan transonique NASA Rotor 67, d'un fan transonique avec nageoires et d'un fan subsonique à large corde
The lightweight, high performance bladed-disks used in today's aeroengines must meet strict standards in terms of aeroelastic stability and resonant response characteristics. The research presented in this thesis is directed toward improved prediction and understanding of blade flutters and forced response problems in turbomachines. To address the blade flutter problem, two aeroelastic analysis methods are considered: the energy method (fluid-structure uncoupled approach) and the modal aeroelastic coupling scheme (fluid-structure coupled approach). The two methods have been implemented in the STRUFLO master code which is designed to provide fluid-structure interfaces for a library of structural and flow solvers. Especially tailored methods are used to couple or interface a wide range of structural and aerodynamic analyses. First, the modal aeroelastic coupling scheme is extended to deal with single blade, cyclic symmetric and full assembly modal analyses as weil as single and multiple blade passage unsteady aerodynamic analyses. Second, an interfacing grid technique is proposed to circumvent problems due to the presence of non-conforming fluid and structural grids at the interface. Finally, a grid-to-grid interpolation/extrapolation scheme is used to transfer blade mode shapes and blade surface unsteady pressures from the structural grid to the aerodynamic grid and vice versa. One structural characteristic of bladed-disks that can significantly impact bath on the aeroelastic stability and the resonant response is that of structural mistuning. With this respect, two reduction methods have been developed to perform full assembly modal analyses and forced response analyses. Various numerical applications are proposed to illustrate the applicability of the above mentioned methods including structural dynamic, aerodynamic and aeroelastic analyses of the NASA Rotor 67 unshrouded transonic fan, a shrouded transonic fan and a subsonic wide chard fan
6

Ahlsén, David. "Experimental and numerical fluid-structure interaction analysis of a suspended rod subjected to forced vibrations." Thesis, KTH, Marina system, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-248028.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
This study is evaluating Solid-Acoustic Finite Element modelling as a method for calculating structural vibration response in water. When designing for example vehicles, it is important to avoid vibrational resonance in any part of the structure, as this causes additional noise and reduced lifespan. It is known that vibration response can be affected by the surrounding medium, i.e. water for marine applications.Previous studies show that this effect is both material and geometry dependant why it is hard to apply standardised design rules. An alternative approach is direct calculation using full Fluid Structure Interaction (FSI) by Computational Fluid Dynamics (CFD) and Finite Element Methods (FEM) which is a powerful but slow and computationally costly method.Therefore, there exists a need for a faster and more efficient calculation method to predict how structures subjected to dynamic loads will respond when submerged in water. By modelling water as an acoustic medium, viscous effects are neglected and calculation time can be drastically reduced. Such an approximation is a linearization of the problem and can be suitable when all deformations are assumed to be small and there are no other nonlinear effects present.This study consists of experimental tests where vibrational response was measured for rod shaped test specimens which were suspended in a water filled test rig and excited using an electrodynamic shaker. A Solid-Acoustic Finite Element model of the same experiment was created, and the test and simulation results were compared. The numerical results were shown to agree well with experiments up to 450 Hz. Above 450 Hz differences occur which is probably due to a simplified rig geometry in the numerical model.
7

Burt, Tiffani M. "STRUCTURE-PROPERTY RELATIONSHIPS OF BLOCK COPOLYMERS CONFINED VIA FORCED ASSEMBLY CO-EXTRUSION FOR ENHANCED PHYSICAL PROPERTIES." Case Western Reserve University School of Graduate Studies / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=case1355879195.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
8

Rama, Parbavati. "A forgotten diaspora : forced Indian Migration to the Cape Colony, 1658 to 1834." University of the Western Cape, 2015. http://hdl.handle.net/11394/4758.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Philosophiae Doctor - PhD
This thesis aims to explore Indian forced migration to the Cape Colony from 1658 to 1834. The forgotten diaspora‘ of its title refers to the first Indians who had come to the shores of South Africa, long before the arrival—between 1860 and 1911—of the indentured Indians. This diaspora has been forgotten, partially because these migrants came as slaves. The author uses data extracted from the newly transcribed Master of the Orphan Chamber (MOOC) series and slave transfers which are housed in the Western Cape Provincial Archives and Records Service (WCARS). The Cape colonial data is considered among the best in the world. Earlier historians such as Victor de Kock, Anna Böeseken, Frank Bradlow and Margaret Cairns, have made us aware of their existence primarily through Transportenkennis and Schepenkennis (transport and shipping information) documents in the Deeds Registry. Not nearly enough, however, is known about these Indian slaves, especially about those who arrived between 1731 and 1834. These lacunae include the number of arrivals; their sex ratios; ages and origins; and the circumstances under which they came. This thesis aims to construct a census of Indian slaves brought to the Cape from 1658 to 1834—along the lines of Philip Curtin's aggregated census of the Trans- Atlantic slave trade, but based on individual case level data coded directly from primary sources. This is the first time the size of the creole population born at the Cape will be established.
9

Matthews, Dax Kristopher. "Examining the wind forced velocity structure of the California Current system using observations derived from satellite remote sensing." Connect to online resource, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3303898.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
10

Yoo, Heemin. "INTERFACIAL STRUCTURE AND DYNAMICS OF NEMATIC 4-n-PENTYL-4'-CYANOBIPHENYL LIQUID CRYSTALS ON SILVER, SILICA AND MODIFIED SILICA SUBSTRATES." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/195254.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
The process of forcibly dewetting a solid substrate from a bulk liquid so as to leave a thin residual layer on the surface is referred to as forced dewetting. This novel experimental approach helps to investigate interfacial species by minimizing the interference of the bulk liquid when coupled with spectroscopy. In this work, the scope of liquids investigating using this approach has been expanded from simple fluids to one type of complex fluid, a nematic liquid crystal, 4-n-pentyl-4'-cyanobiphenyl (5CB).In order to better understand the interfacial behavior of the simple fluids, water, chloroform, and n-pentane vapors were adsorbed onto omega-terminated SAM-modifed Ag (11-mercaptoundecanoic acid, 11-mercaptoundenanol, and undecanethiol) surfaces under vapor-saturated conditions. The kinetics of solvent adsorption on each of these surfaces were investigated and the thicknesses of the adsorbed layer were compared to predictions from Lifshitz theory of long-range van der Waals interactions. Although the predicted thicknesses do not match the experimental values for adsorbed films, the predicted thicknesses do match those observed experimentally using forced dewetting. The correlation between these predicted and observed thicknesses implies that residual film formation under the conditions of forced dewetting used in this laboratory is dictated by interfacial forces alone.The surface adsorption behavior of 5CB was investigated using surface-enhanced Raman spectroscopy with the aid of localized surface plasmon resonances-surface plasmon polaritron coupling. The results clearly indicate that 5CB is adsorbed to smooth Ag surface in a facial orientation with pi-d orbital interaction suggested.Finally, forced dewetting studies of bare, -NH2-temintaed SAM, and -CH3-temintaed SAM modified-SiO2 substrates from 5CB were undertaken. Residual layer thicknesses were monitored as a function of substrate velocity. The transition from the regime in which interfacial forces dictate residual layer thickness to the regime in which fluid dynamic forces dictate thickness was observed for the first time and was evaluated in terms of the average 5CB director orientation. Unlike simple fluids, 5CB has strong interfacial interactions from surface anchoring depending on the chemical nature of the substrate, which makes the residual layer thicknesses at least 100 times larger than observed in simple fluids.
Більше джерел

Книги з теми "Forced structure":

1

Young, Thomas-Durell. Multinational land forces and the NATO force structure review. [Carlisle Barracks, Pa.]: Strategic Studies Institute, U.S. Army War College, 2000.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
2

United States Departmet of the Air Force. The enlisted force structure. Washington, DC: Dept. of the Air Force, Headquarters, 1986.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Bardon, Keith. Exploring forces and structures. Austin, Tex: Raintree Steck-Vaughn Library, 1992.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
4

Fletcher, Charles V. A force structure design model. Monterey, Calif: Naval Postgraduate School, 1991.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
5

Sarpkaya, Turgut. Wave forces on offshore structures. Cambridge: Cambridge University Press, 2010.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
6

Sarpkaya, Turgut. Wave forces on offshore structures. New York: Cambridge University Press, 2010.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
7

Sarpkaya, Turgut. Wave forces on offshore structures. Cambridge: Cambridge University Press, 2010.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
8

Zhao, Xiao-Ling. Cold-formed tubular members and connections: Structural behaviour and design. Oxford: Elsevier, 2005.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
9

Office, General Accounting. Force structure: Projected requirements for some Army forces not well established : report to congressional committees. Washington, D.C. (P.O. Box 37050, Washington, D.C. 20013): U.S. General Accounting Office, 2001.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
10

Dubina, Dan, Viorel Ungureanu, and Raffaele Landolfo. Design of Cold-formed Steel Structures. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783433602256.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Більше джерел

Частини книг з теми "Forced structure":

1

Lin, Yi, and Bailey Forrest. "Happiness, Fear, and Forced Struggle." In Systemic Structure Behind Human Organizations, 363–92. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-2311-9_14.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
2

Gusev, Boris V., and Alexander S. Faivusovich. "Forced Vibrations of the System: Structure – Viscoelastic Layer." In Recent Advances in Mechanics, 79–89. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0557-9_6.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Dempsey, Kevin, and Irena Vasileva. "Forced Dynamic Uplift of Floating Plates." In IUTAM Symposium on Integrated Modeling of Fully Coupled Fluid Structure Interactions Using Analysis, Computations and Experiments, 391–400. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-007-0995-9_28.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
4

Farge, Marie, Kai Schneider, and Nicholas K. R. Kevlahan. "Coherent Structure Eduction in Wavelet-Forced Two-Dimensional Turbulent Flows." In IUTAM Symposium on Dynamics of Slender Vortices, 65–83. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5042-2_6.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
5

Lecuona, A., P. Rodriguez, and J. C. Lasheras. "Three-Dimensional Structure of Strongly Forced Jet Diffusion Flames: Flow Visualization Studies." In Combustings Flow Diagnostics, 67–78. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2588-8_3.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
6

Parameswaran, Harikrishnan, and Béla Suki. "Assessing Structure–Function Relations in Mice Using the Forced Oscillation Technique and Quantitative Histology." In Methods in Molecular Biology, 77–91. New York, NY: Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-7163-3_8.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
7

Lasheras, Juan C., Antonio Lecuona, and Pedro Rodriguez. "Three-Dimensional Structure of the Vorticity Field in the Near Region of Laminar, Co-Flowing Forced Jets." In NATO ASI Series, 95–109. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3750-2_9.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
8

Millais, Malcolm. "Internal forces." In Building Structures, 36–56. Third edition. | New York : Routledge, 2017.: Routledge, 2017. http://dx.doi.org/10.4324/9781315652139-2.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
9

Soares, Ana Luiza M. "Forced Labor and Disciplinary Control: A History of Indigenous Peoples’ Treatment and Agency in the City of Manaus, Brazil." In Human Conflict from Neanderthals to the Samburu: Structure and Agency in Webs of Violence, 81–104. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-46824-8_6.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
10

Derjaguin, B. V., N. V. Churaev, and V. M. Muller. "The Structure of Boundary Layers of Liquids and the Structural Component of Disjoining Pressure." In Surface Forces, 231–91. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4757-6639-4_7.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.

Тези доповідей конференцій з теми "Forced structure":

1

Kruse, Marlin, and Christophe Pierre. "Forced response of mistuned bladed disks using reduced-order modeling." In 37th Structure, Structural Dynamics and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-1545.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
2

Nakrap, I. A., A. N. Savin, and Y. P. Sharaevsky. "Forced and own waves of coupled cavity periodic structure." In 2004 14th International Crimean Conference "Microwave and Telecommunication Technology". IEEE, 2004. http://dx.doi.org/10.1109/crmico.2004.183162.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Preidikman, S., H. Li, and B. Balachandran. "Forced Oscillations of Microelectromechanical Resonators." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-55552.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Forced oscillations of micromechanical resonators fabricated as clamped-clamped composite structures are studied in this effort. Piezoelectric actuation is used to excite these structures on the input side and piezoelectric sensing is carried out on the output side. Each resonator structure is modeled as a beam with stepwise properties and a distributed actuation. For weak damping and weak forcing, a nonlinear analysis is conducted to obtain an approximate solution of the system. In this analysis, the method of multiple scales is used on the governing partial differential system and a solution is sought to describe oscillations about a buckled position. The different modeling assumptions made are presented and discussed.
4

Clément, Simon, Sergio Bellizzi, Bruno Cochelin, and Guillaume Ricciardi. "Sliding Window POD Analysis of Vibrating Structures: Application to Nonlinear Forced Structure Under Axial Flow." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-12803.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
In this paper, a multivariate data analysis method combining the Proper Orthogonal Decomposition (POD) and a time-frequency analysis (TEA) is presented. The POD method is a tool adapted to the study of multi-degrees of freedom systems, which can give some insight of the behavior of complex nonlinear systems, whereas TEA is suitable for scalar signal with multi-frequency components. The method presented here is of principal interest in the case of swept-sine excitation of complex multi-DOF systems. It will be first applied to a synthetic signal, then mechanical simulations and finally experimental results.
5

Wang, J. J. Junz, and C. Y. Huang. "A Pole/Zero Placement Approach to Reducing Structure Vibration in End Milling." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-42368.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Forced vibration or the steady state vibration in a milling process inevitably occurs due to the periodic excitation of the intermittent cutting engagement of the milling cutter on the work and the structure, and it almost always exist even in the absence of chatter in a stable milling system, leading to dimensional and surface error and premature wear in tool and machine components. In this paper, an analytical model for the forced vibration in an end milling process is derived and criteria in selecting cutting conditions to reduce the forced vibration are presented. The analytic expression for the forced vibration due to the periodic milling force is obtained as the product of the Fourier transform of the milling force and the frequency transform of the structure dynamics. Analysis of the vibration model shows that the structure vibration can be reduced by selecting cutting parameters so that the zeroes of the frequency transform of the milling process function are near the poles of the structure dynamics. A design equation in terms of cutter geometry, axial depth of cut and structure natural frequency is obtained for the conditions when the forced vibration can be minimized. The presented analysis is illustrated through numerical simulation and verified by experimental results.
6

Yucel, Adil, and Alaeddin Arpaci. "Analysis of Free and Forced Ship Vibrations Using Finite Element Method." In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-24856.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
With the increase of ship size and speed, shipboard vibration becomes a great concern in the design and construction of the vessels. Excessive ship vibration is to be avoided for passenger comfort and crew habitability. In addition to undesired effects on humans, excessive ship vibration may result in the fatigue failure of local structural members or malfunction of machinery and equipment. The propeller induces fluctuating pressures on the surface of the hull, which induce vibration in the hull structure. These pressure pulses acting on the ship hull surface above the propeller as the predominant factor for vibrations of ship structures are taken as excitation forces for forced vibration analysis. Ship structures are complex and may be analyzed after idealization of the structure. Several simplifying assumptions are made in the finite element idealization of the hull structure. In this study, a three-dimensional finite element model representing the entire ship hull, including the deckhouse and machinery propulsion system, has been developed using a solid modeling software for local and global vibration analyses. Vibration analysis has been studied under two conditions which are free-free (dry) and in-water (wet). Wet analysis has been implemented using acoustic elements. The total damping associated with overall ship hull structure vibration has been considered as a combination of the several damping components. As the result of global ship free vibration analysis, global natural frequencies and mode shapes have been determined. Besides, responses of local ship structures have been determined as the result of propeller induced forced vibration analysis.
7

Janicki, Marcin, Jedrzej Banaszczyk, Gilbert De Mey, Marek Kaminski, Bjorn Vermeersch, and Andrzej Napieralski. "Application of structure functions for the investigation of forced air cooling." In 2007 13th International Workshop on Thermal Investigation of ICs and Systems (THERMINIC). IEEE, 2007. http://dx.doi.org/10.1109/therminic.2007.4451737.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
8

Payer, Florent, Pascal Ferrand, Alain Dugeai, and Fabrice Thouverez. "Comparison of Fluid-Structure Coupling Methods for Blade Forced Response Prediction." In ASME 2012 Gas Turbine India Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gtindia2012-9521.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
A time-marching coupled method has been applied to a high pressure compressor forced response case. The purpose of the study is to compare the contribution of the coupled scheme against the state of the art decoupled methodology. Although the time-marching scheme allows for a stronger coupling between the motion and aerodynamic field, results have shown good agreement with the decoupled method. The additional computing cost arising from the long transient state and the small difference in amplitude prediction with the decoupled scheme reduce the interest for the coupled one. A new transient state method is proposed to combine both coupled and decoupled schemes features. Here, the forcing and damping functions are extracted during the mechanical transient state of the coupled simulation and forced response is calculated as in the decoupled method. Results have shown good agreements with the experiment and all the methods are compared in terms of underlying assumptions and performances.
9

Vasanthakumar, Parthasarathy, and Paul-Benjamin Ebel. "Forced Response Analysis of a Transonic Fan." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69867.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
The forced response of turbomachinery blades is a primary source of high cycle fatigue (HCF) failure. This paper deals with the computational prediction of blade forced response of a transonic fan stage that consists of a highly loaded rotor along with a tandem stator. In the case of a transonic fan, the forced response of the rotor due to the downstream stator assumes significance because of the transonic flow field. The objective of the present work is to determine the forced response of the rotor induced as a result of the unsteady flow field due to the downstream stator vanes. Three dimensional, Navier-Stokes flow solver TRACE is used to numerically analyse the forced response of the fan. A total of 11 resonant crossings as identified in the Campbell diagram are examined and the corresponding modeshapes are obtained from finite element modal analysis. The interaction between fluid and structure is dealt with in a loosely coupled manner based on the assumption of linear aerodynamic damping. The aerodynamic forcing is obtained by a nonlinear unsteady Navier-Stokes computation and the aerodynamic damping is obtained by a time-linearized Navier-Stokes computation. The forced response solution is obtained by the energy method allowing calculations to be performed directly in physical space. Using the modal forcing and damping, the forced response amplitude can be directly computed at the resonance crossings. For forced response solution, the equilibrium amplitude is reached when the work done on the blade by the external forcing function is equal to the work done by the system damping (aerodynamic and structural) force. A comprehensive analysis of unsteady aerodynamic forces on the rotor blade surface as a result of forced response of a highly loaded transonic fan is carried out. In addition, the correspondence between the location of high stress zones identified from the finite element analysis and the regions of high modal force identified from the CFD analysis is also discussed.
10

Shu, Lei, Michael Yu Wang, Zongde Fang, and Zhengdong Ma. "Structural Topology Optimization for Forced Vibration Problem Using Level Set Method." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47037.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
For the purpose of structure vibration reduction, a structural topology optimization for forced vibration problem is proposed based on the level set method. The objective of present study is to minimize the frequency response at the specified points or surfaces on the structure with an excitation frequency or a frequency range, subject to the given amount of the material over the admissible design domain. The sensitivity analysis with respect to the structural boundaries is carried out, while the X-FEM is employed for solving the state equation and the adjoint equation. The optimal structure with smooth boundaries is obtained by the level set evolution with advection velocity, derived from the sensitivity analysis and the optimization algorithm. A number of two-dimensional numerical examples are presented to demonstrate the feasibility and effectiveness of the proposed approach.

Звіти організацій з теми "Forced structure":

1

Bell, Gary, and Duncan Bryant. Red River Structure physical model study : bulkhead testing. Engineer Research and Development Center (U.S.), June 2021. http://dx.doi.org/10.21079/11681/40970.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
The US Army Corps of Engineers, St. Paul District, and its non-federal sponsors are designing and constructing a flood risk management project that will reduce the risk of flooding in the Fargo-Moorhead metropolitan area. There is a 30-mile long diversion channel around the west side of the city of Fargo, as well as a staging area that will be formed upstream of a 20-mile long dam (referred to as the Southern Embankment) that collectively includes an earthen embankment with three gated structures: the Diversion Inlet Structure, the Wild Rice River Structure, and the Red River Structure (RRS). A physical model has been constructed and analyzed to assess the hydraulic conditions near and at the RRS for verification of the structure’s flow capacity as well as optimization of design features for the structure. This report describes the modeling techniques and instrumentation used in the investigation and details the evaluation of the forces exerted on the proposed bulkheads during emergency operations for the RRS.
2

Young, Thomas-Durell. Multinational Land Forces and the NATO Force Structure Review. Fort Belvoir, VA: Defense Technical Information Center, June 2000. http://dx.doi.org/10.21236/ada382815.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Terranova, Susan. Evolving Russian Military Doctrine: Force Structure and Capabilities of the Armed Forces. Fort Belvoir, VA: Defense Technical Information Center, March 1993. http://dx.doi.org/10.21236/ada267540.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
4

Viets, Herman. Forced Three Dimensional Flow Structures. Fort Belvoir, VA: Defense Technical Information Center, September 1985. http://dx.doi.org/10.21236/ada179652.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
5

Vavrin, John L., Ghassan K. Al-Chaar, Eric L. Kreiger, Michael P. Case, Brandy N. Diggs, Richard J. Liesen, Justine Yu, et al. Automated Construction of Expeditionary Structures (ACES) : Energy Modeling. Engineer Research and Development Center (U.S.), February 2021. http://dx.doi.org/10.21079/11681/39641.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
The need to conduct complex operations over time results in U.S. forces remaining in deployed locations for long periods. In such cases, more sustainable facilities are required to better accommodate and protect forward deployed forces. Current efforts to develop safer, more sustainable operating facilities for contingency bases involve construction activities that redesign the types and characteris-tics of the structures constructed, reduce the resources required to build, and reduce resources needed to operate and maintain the com-pleted facilities. The Automated Construction of Expeditionary Structures (ACES) project was undertaken to develop the capability to “print” custom-designed expeditionary structures on demand, in the field, using locally available materials with the minimum number of personnel. This work investigated large-scale automated “additive construction” (i.e., 3D printing with concrete) for construction applications. This document, which documents ACES energy and modeling, is one of four technical reports, each of which details a major area of the ACES research project, its research processes, and associated results, including: System Requirements, Construction, and Performance; Energy and Modeling; Materials and Testing; Architectural and Structural Analysis.
6

Diggs, Brandy N., Richard J. Liesen, Michael P. Case, Sameer Hamoush, and Ahmed C. Megri. Automated Construction of Expeditionary Structures (ACES) : Energy Modeling. Engineer Research and Development Center (U.S.), February 2021. http://dx.doi.org/10.21079/11681/39759.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
The need to conduct complex operations over time results in U.S. forces remaining in deployed locations for long periods. In such cases, more sustainable facilities are required to better accommodate and protect forward deployed forces. Current efforts to develop safer, more sustainable operating facilities for contingency bases involve construction activities that redesign the types and characteris-tics of the structures constructed, reduce the resources required to build, and reduce resources needed to operate and maintain the com-pleted facilities. The Automated Construction of Expeditionary Structures (ACES) project was undertaken to develop the capability to “print” custom-designed expeditionary structures on demand, in the field, using locally available materials with the minimum number of personnel. This work investigated large-scale automated “additive construction” (i.e., 3D printing with concrete) for construction applications. This document, which documents ACES energy and modeling, is one of four technical reports, each of which details a major area of the ACES research project, its research processes, and associated results, including: System Requirements, Construction, and Performance; Energy and Modeling; Materials and Testing; Architectural and Structural Analysis.
7

Blank, Gary. Synthetic Force Structure Simulation (SFSS). Fort Belvoir, VA: Defense Technical Information Center, June 2002. http://dx.doi.org/10.21236/ada407185.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
8

Feldmayer, Charles F. Force Structure Implications of Start. Fort Belvoir, VA: Defense Technical Information Center, March 1989. http://dx.doi.org/10.21236/ada209674.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
9

Al-Chaar, Ghassan K., Peter B. Stynoski, Todd S. Rushing, Lynette A. Barna, Jedadiah F. Burroughs, John L. Vavrin, and Michael P. Case. Automated Construction of Expeditionary Structures (ACES) : Materials and Testing. Engineer Research and Development Center (U.S.), February 2021. http://dx.doi.org/10.21079/11681/39721.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Complex military operations often result in U.S. forces remaining at deployed locations for long periods. In such cases, more sustaina-ble facilities are required to better accommodate and protect forward-deployed forces. Current efforts to develop safer, more sustaina-ble operating facilities for contingency bases involve construction activities that require a redesign of the types and characteristics of the structures constructed, that reduce the resources required to build, and that decrease the resources needed to operate and maintain the completed facilities. The Automated Construction of Expeditionary Structures (ACES) project was undertaken to develop the capa-bility to “print” custom-designed expeditionary structures on demand, in the field, using locally available materials with the minimum number of personnel. This work investigated large-scale automated “additive construction” (i.e., 3D printing with concrete) for con-struction applications. This report, which documents ACES materials and testing, is one of four technical reports, each of which details a major area of the ACES research project, its research processes, and its associated results. There major areas include System Require-ments, Construction, and Performance; Energy and Modeling; Materials and Testing; Architectural and Structural Analysis.
10

Muhlestein, Michael, and Carl Hart. Numerical analysis of weak acoustic shocks in aperiodic array of rigid scatterers. Engineer Research and Development Center (U.S.), October 2020. http://dx.doi.org/10.21079/11681/38579.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Nonlinear propagation of shock waves through periodic structures have the potential to exhibit interesting phenomena. Frequency content of the shock that lies within a bandgap of the periodic structure is strongly attenuated, but nonlinear frequency-frequency interactions pumps energy back into those bands. To investigate the relative importance of these propagation phenomena, numerical experiments using the Khokhlov-Zabolotskaya-Kuznetsov (KZK) equation are carried out. Two-dimensional propagation through a periodic array of rectangular waveguides is per-formed by iteratively using the output of one waveguide as the input for the next waveguide. Comparison of the evolution of the initial shock wave for both the linear and nonlinear cases is presented.

До бібліографії