Dissertationen zum Thema „Couple dynamic“
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Manceau, Charlotte. „Analyse des dynamiques et processus dyadiques sous-jacents à l'expérience du couple confronté à une maladie neuroévolutive“. Electronic Thesis or Diss., Université de Lille (2022-....), 2024. https://pepite-depot.univ-lille.fr/ToutIDP/EDSHS/2024/2024ULILH020.pdf.
Der volle Inhalt der QuelleNeurodegenerative diseases (NDDs) raise numerous implications for the health, well-being, and quality of life of both the partner with the disease and their caregiving spouses. In the face of these challenges, numerous studies have sought to understand the experiences of these individuals and evaluate the effectiveness of well-being-centered interventions. While individual approaches are important, the literature has underscored the significance of considering the dyad and the relational processes at play, particularly to optimize such interventions. However, while numerous models detail how couples adjust to chronic illness, NDDs are not integrated into these models, except for a few exceptions, indicating the need for further investigation of couple functioning in the context of NDDs. Therefore, the objectives of this thesis were to better understand the experiences of couples and the dyadic processes underlying their functioning, through a meta-synthesis centered on various NDDs (study 1) and two studies and functioning of couples facing Parkinson's disease (PD) (studies 2 and 3). Capturing changes in couple functioning across different stages of the disease was another objective. A thematic synthesis (study 1) and two qualitative empirical studies using Interpretative Phenomenological Analysis (study 2) were conducted. Study 2 explored the experiences of 15 couples at the specific stage known as the honeymoon period of PD. Study 3 involved a comparison of processes identified in three distinct samples of 15 couples, at three stages of PD, to identify prevalent functioning patterns and transitions in couple dynamics throughout the disease progression. Studies 2 and 3 identified five patterns of dyadic functioning, as well as transitions in dyadic dynamics, often linked to symptom progression. Some partners demonstrate mutual support and positive reinterpretation of their experience, evolving towards a dynamic where the caregiver provides subtle assistance to preserve this balance. For others, this discreet help, a subject of negotiation within the couple from the onset of the disease, abruptly transforms into control. While some spouses struggle against the disease from the early stages by exerting a form of control, their partner disengages. With symptom progression, it becomes impossible to avoid this control, which turns into intrusion. Additionally, some couples adopt a rigid hyperprotection against the distress induced by PD, with this avoidance strengthening over time. Finally, another pattern, characterized by difficulty in understanding the other's perspective and by a mutual disengagement shown by partners, also becomes more rigid over time, potentially leading to questioning the couple's relationship. These studies have highlighted different dyadic dynamics and their associated processes within the context of NDDs, specifically PD. The transitions identified in couple functioning throughout the disease progression indicate the importance of considering the couple's experience from the onset of the disease and throughout its evolution. These findings are significant, as they suggest several specificities of dyadic functioning in the face of NDDs. Furthermore, they reveal similarities in processes observed in the context of PD, Alzheimer's disease, or other chronic illnesses. These various aspects are thus important for the development of transdiagnostic interventions and future research aimed at exploring dyadic processes associated with couples' experience of other less studied diseases
Meguenani, Anis. „Safe control of robotic manipulators in dynamic contexts“. Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066420/document.
Der volle Inhalt der QuelleThe intended goal of this thesis is to bring new insights for developing robotic systems capable of safely sharing their workspace with human-operators. Within this context, the presented work focuses on the control problem. The following questions are tackled:-for reactive control laws, i.e., control problems where the task to be performed is not known in advance but discovered on-line, how is it possible to guarantee for every time-step the existence of a solution to the control problem? This solution should allow the robot to accomplish at best its prescribed task and at the same time to strictly comply with existing constraints, among which, constraints related to the physical limitations of its actuators and joints.-How to integrate the human-operator in the control loop of the robot so that physical contact can safely be engaged and de-engaged? Regarding the first point, our work arises as the continuity of previous results developed by Sébastien Rubrecht during his PhD thesis. Sébastien Rubrecht introduced the concept of constraints incompatibility for robots reactively controlled at the kinematic-level. The problem of constraints incompatibility appears for example when the formulation of the constraint on an articular position of a robot does not account for the amount of deceleration producible by its actuator. In such case, if the articular position constraint is activated tardively, the system may not have sufficient time to cope with the imposed joint position limit considering its bounded dynamic capabilities
Wei, Chen. „Static force capabilities and dynamic capabilities of parallel mechanisms equipped with safety clutches“. Master's thesis, Université Laval, 2014. http://hdl.handle.net/20.500.11794/24810.
Der volle Inhalt der QuelleThis thesis investigates the force capabilities of two-degree-of-freedom planar parallel mechanisms that are equipped with safety clutches (torque limiters). The force capabilities are studied based on the Jacobian matrices. The maximum force that can be applied at the end-effector for given torque limits (safety index) is determined together with the maximum isotropic force that can be produced. The ratio between these two forces, referred to as the force effectiveness, can be considered as a performance index. Finally, some numerical results are proposed which can provide insight into the design of cooperation robots based on parallel architectures. Considering each link and slider system as a single body, approximate dynamic models are derived based on the Newton-Euler approach and Lagrange equations for the tripteron and the quadrupteron. The acceleration range or the external force range of the end-effector are determined and given as a safety consideration with the dynamic models.
Tan, Yang. „Transitions continues des tâches et des contraintes pour le contrôle de robots“. Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066096/document.
Der volle Inhalt der QuelleLarge and sudden changes in the torques of the actuators of a robot are highly undesirable and should be avoided during robot control as they may result in unpredictable behaviours. Multi-objective control system for complex robots usually have to handle multiple prioritized tasks while satisfying constraints. Changes in tasks and/or constraints are inevitable for robots when adapting to the unstructured and dynamic environment, and they may lead to large sudden changes in torques. Within this work, the problem of task priority transitions and changing constraints is primarily considered to reduce large sudden changes in torques. This is achieved through two main contributions as follows. Firstly, based on quadratic programming (QP), a new controller called Generalized Hierarchical Control (GHC) is developed to deal with task priority transitions among arbitrary prioritized task. This projector can be used to achieve continuous task priority transitions, as well as insert or remove tasks among a set of tasks to be performed in an elegant way. The control input (e.g. joint torques) is computed by solving one quadratic programming problem, where generalized projectors are adopted to maintain a task hierarchy while satisfying equality and inequality constraints. Secondly, a predictive control primitive based on Model Predictive Control (MPC) is developed to handle presence of discontinuities in the constraints that the robot must satisfy, such as the breaking of contacts with the environment or the avoidance of an obstacle. The controller takes the advantages of predictive formulations to anticipate the evolutions of the constraints by means of control scenarios and/or sensor information, and thus generate new continuous constraints to replace the original discontinuous constraints in the QP reactive controller. As a result, the rate of change in joint torques is minimized compared with the original discontinuous constraints. This predictive control primitive does not directly modify the desired task objectives, but the constraints to ensure that the worst case of changes of torques is well-managed. The effectiveness of the proposed control framework is validated by a set of experiments in simulation on the Kuka LWR robot and the iCub humanoid robot. The results show that the proposed approach significantly decrease the rate of change in joint torques when task priorities switch or discontinuous constraints occur
Dunton, Alec. „Topological Data Analysis for Systems of Coupled Oscillators“. Scholarship @ Claremont, 2016. http://scholarship.claremont.edu/hmc_theses/79.
Der volle Inhalt der QuelleGu, Bei 1970. „Co-simulation of algebraically coupled dynamic subsystems“. Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8695.
Der volle Inhalt der QuelleIncludes bibliographical references (leaves 108-110).
In the manufacturing industry out-sourcing/integration is becoming an important business pattern (not a clear statement-integration still done in house-component design and manufacturing outsourced). An engineering system often consists of many subsystems supplied by different companies. Bridge between thoughts is weak. Object-oriented modeling is an effective tool for modeling of complex coupled systems. However, subsystem models have to be assembled and compiled before they can produce simulation results for the coupled system. Compiling models into simulations? is time consuming and often requires a profound understanding of the models. Also, the subsystem makers cannot preserve their proprietary information in the compilation process. This research is intended to address this problem by extending object-oriented modeling to object-oriented simulation called co-simulation. Co-Simulation is an environment in which we can simultaneously run multiple independent compiled simulators to simulate a large coupled system. This research studies a major challenge of object-oriented simulation: incompatible boundary conditions between subsystem simulators caused by causal conflicts. The incompatible boundary condition is treated as an algebraic constraint. The high index of the algebraic constraint is reduced by defining a sliding manifold, which is enforced by a discrete-time sliding mode controller. The discrete-time approach fits well with the numerical simulation since it can guarantee numerical stability.
(cont.) A Boundary Condition Coordinator (BCC), which implements the discrete-time controller, makes the incompatible boundary condition compatible. Multi-rate sliding controllers are developed to guarantee the stability of the sliding manifold with any integration step size for the subsystem simulators. A multi- rate sliding mode scheme is specially devised to minimize information disclosure from the subsystem simulators and to facilitate pure numerical computation. The influence of the BCCs on the rest of the subsystem simulators is studied using the input-output linearization theory. The Co-Simulation software environment is developed in Java. Subsystem simulators and BCCs run as independent processes in the Co-Simulation environment. Class templates containing all necessary functions for different types of subsystems are defined. Engineers can easily build a subsystem simulator by simply providing only the mathematical model, which will be hidden after the subsystem simulator is made. Integration engineers can assemble subsystem simulators into simulation of the large coupled system by merely making connections among subsystems. The object-oriented class design makes it possible to extend the Co-Simulation over the Internet or to compile subsystems into a single thread simulator.
by Bei Gu.
Ph.D.
ABDEL-MOMEN, SHERIF SAMIR. „DYNAMIC RESOURCE BALANCING BETWEEN TWO COUPLED SIMULATIONS“. University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1060893659.
Der volle Inhalt der QuelleOliviero, Mattia. „Fertility Decisions in Context - Individual and Couple Dynamics“. Doctoral thesis, Università degli studi di Trento, 2019. http://hdl.handle.net/11572/243214.
Der volle Inhalt der QuelleOliviero, Mattia. „Fertility Decisions in Context - Individual and Couple Dynamics“. Doctoral thesis, Università degli studi di Trento, 2019. http://hdl.handle.net/11572/243214.
Der volle Inhalt der QuelleSun, Hongyan. „Coupled nonlinear dynamical systems“. Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1636.
Der volle Inhalt der QuelleTitle from document title page. Document formatted into pages; contains xi, 113 p. : ill. (some col.). Includes abstract. Includes bibliographical references.
Jacob, Persson. „Dynamics of Coupled Spin and Displacement“. Thesis, Uppsala universitet, Materialteori, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-294850.
Der volle Inhalt der QuelleJoners spinn- respektive förflyttningsdynamik har väl etablerade teoretiska grunder. Med syftet att utöka den teoretiska kunskapen undersöker jag hur spinn- och förflyttningsdynamiken hos två joner påverkas av kopplade interaktioner mellan deras spinn och förflyttning. Resultatet visar att dynamiken beror på spinnets och förflyttningens farter.
Denman-Johnson, Matthew G. „Dynamics of synaptically coupled McKean neurons“. Thesis, Loughborough University, 2004. https://dspace.lboro.ac.uk/2134/36171.
Der volle Inhalt der QuelleMatharu, Satpal. „Charge dynamics in coupled semiconductor superlattices“. Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/17158.
Der volle Inhalt der QuelleShim, Sangyun. „Coupled dynamic analysis of floating offshore wind farms“. [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-2564.
Der volle Inhalt der QuelleUrgueira, Antonio Paulo Vale. „Dynamic analysis of coupled structures using experimental data“. Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46590.
Der volle Inhalt der QuelleLiu, Wenjie. „Structural dynamic analysis and testing of coupled structures“. Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246801.
Der volle Inhalt der QuelleHui, Yau-Chee. „Dynamic studies of proximity coupled Josephson junction arrays /“. The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487848078449018.
Der volle Inhalt der QuelleWordsworth, John. „Winnerless competition in neural dynamics : cluster synchronisation of coupled oscillators“. Thesis, University of Exeter, 2009. http://hdl.handle.net/10036/87314.
Der volle Inhalt der QuelleKatsanis, George R. Mr. „Transient Small Wind Turbine Tower Structural Analysis with Coupled Rotor Dynamic Interaction“. DigitalCommons@CalPoly, 2013. https://digitalcommons.calpoly.edu/theses/960.
Der volle Inhalt der QuelleDies, Miracle Marta. „Coupled dynamical processes in bacteria“. Doctoral thesis, Universitat Politècnica de Catalunya, 2015. http://hdl.handle.net/10803/401630.
Der volle Inhalt der QuelleL’objectiu d’aquesta Tesi és l’estudi de l’acoblament dinàmic entre processos cel·lulars, i de com aquest acoblament genera un comportament ben definit en presència de no-linealitats i soroll. Un funcionament cel·lular correcte depèn de la coordinació exquisida entre un gran nombre de processos dinàmics no lineals subjectes a fluctuacions, que s’esdevenen simultàniament dins la cèl·lula. Aquests tipus de processos dinàmics no tenen lloc de manera aïllada en una cèl·lula sinó que ocorren de manera simultània, essent per tant necessari establir l’origen i el grau de coordinació entre ells. Totes aquestes qüestions romanen encara sense resposta. A la Part I introduïm i motivem els dos tipus de dinàmiques cel·lulars que hem estudiat en aquesta Tesi. Dediquem la Part II als polsos d’expressió o activitat de proteïnes (Capítols 2 i 3), mentre que ens concentrem en les oscil·lacions periòdiques d’expressió de proteïnes a la Part III (Capítol 4). Concretament, en el Capítol 2 abordem la qüestió sobre com l’acoblament de certs senyals d’entrada afecten la resposta del circuit que regula la competència per a la incorporació d’ADN en Bacillus subtilis. En cèl·lules silvestres i sota determinades condicions d’estrès ambiental, s’ha determinat que l’estat de competència segueix una dinàmica de polsos estocàstics. Aquí estudiem com la resposta dinàmica del circuit de competència varia des de polsos excitables fins a la biestabilitat i les oscil·lacions, depenent de l’acció conjunta de les dues entrades acoblades aplicades al sistema. Els efectes fenotípics reportats en aquest Capítol són causats per canvis en el comportament dinàmic del circuit genètic subjacent. L’anàlisi d’estabilitat d’un model teòric del circuit de competència estableix els diferents règims dinàmics que pot exhibir el circuit, els quals estan quantitativament d’acord amb els resultats experimentals. Seguint amb dinàmiques de polsos, al Capítol 3 estudiem l’acoblament dinàmic entre polsos d’activitat de proteïnes en cèl·lules individuals. A aquest efecte, en col·laboració amb el laboratori del Prof. M. Elowitz de l’Institut de Tecnologia de Califòrnia, vàrem concentrar-nos en la família de factors sigma alternatius en B. subtilis. Els factors sigma són proteïnes que s’uneixen a l’ARN polimerasa de manera reversible, fent possible el reconeixement de promotors específics per part de l’holoenzim format. En aquest Capítol mostrem que diversos factors sigma alternatius presenten polsos estocàstics en la seva activació, i que aquests polsos competeixen per l’ARN polimerasa. A la llum d’aquests resultats proposem un nou mecanisme de repartiment, que anomenem en anglès “time-share”, pel qual els factors sigma fan torns en el temps per utilitzar la majoria d’ARN polimerasa disponible. D’aquesta manera, només un o molt pocs factors sigma estarien actius simultàniament en una mateixa cèl·lula. També hem desenvolupat una sèrie de models matemàtics que revelen com els polsos i la competició afecten la distribució de l’ARN polimerasa. Al Capítol 4 estudiem com un oscil·lador genètic sintètic està acoblat a la replicació i la divisió cel·lular. Vam utilitzar l’oscil·lador sintètic desenvolupat per a Escherichia coli al laboratori del Prof. J. Hasty a la Universitat de Califòrnia San Diego. Mostrem com el cicle cel·lular bacterià és capaç d’entrenar parcialment les oscil·lacions sintètiques de manera consistent en condicions de creixement normal, tot dirigint la replicació periòdica dels gens involucrats en l’oscil·lador. També exposem que la sincronització entre els dos processos periòdics s’incrementa si l’oscil·lador sintètic es retroacobla al cicle cel·lular mitjançant l’expressió d’un inhibidor de la iniciació de la replicació. A més, hem desenvolupat un model computacional simplificat que confirma aquest efecte. Finalment, a la Part IV (Capítol 5) resumim i discutim els principals resultats presentats en aquesta Tesi, i suggerim direccions futures cap a on ampliar la recerca.
Garira, Winston. „Synchronisation of coupled dynamical systems“. Thesis, University of London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399495.
Der volle Inhalt der QuelleHeath, Ted H. „Synchronization and phase dynamics of coupled oscillators“. Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/30310.
Der volle Inhalt der QuelleReed, Rebecca Ginny. „Interpersonal Immune and Emotion Dynamics in Couples“. Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/556225.
Der volle Inhalt der QuelleBeasley, Benjamin S. „Coupled Barrier Island Shoreline and Shoreface Dynamics“. ScholarWorks@UNO, 2018. https://scholarworks.uno.edu/td/2508.
Der volle Inhalt der QuelleAdams, Daniel J. „Magnetization Dynamics in Coupled Thin Film Systems“. ScholarWorks@UNO, 2019. https://scholarworks.uno.edu/td/2578.
Der volle Inhalt der QuelleScuse, Paul Donald. „The odd couple, a developmental perspective in pastoral relationship dynamics“. Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0003/NQ40323.pdf.
Der volle Inhalt der QuelleTierney, Christopher John. „Non-linear dynamics of couple SQUID ring : tank circuit systems“. Thesis, University of Sussex, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360589.
Der volle Inhalt der QuelleRose, Alexander. „The dynamic coupling interface of G-protein coupled receptors“. Doctoral thesis, Humboldt-Universität zu Berlin, Lebenswissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17215.
Der volle Inhalt der QuelleTo communicate with their environment, living cells feature receptors that provide a bridge across the enclosing membrane. The prevalent G protein-coupled receptors (GPCR) receive outside information through the binding of a ligand, which activates the receptor. During activation, an open intracellular crevice forms, to which a G protein (Gαβγ, G) can couple with its Gα C-terminus. Binding to GPCRs triggers GDP/GTP exchange in the Gα subunit of Gαβγ, necessary for further signal transfer within the cell. The coupling between receptor and Gαβγ involves a series of dynamic structural changes that govern speed and specificity of the interaction. Here we used molecular dynamics (MD) simulations to elucidate molecular details of the GPCR Gαβγ coupling process before and during GPCR Gαβγ complex formation up to the GDP/GTP exchange.
Restrepo, Juan Gabriel. „Dissertation prospectus : dynamics on networks of coupled oscillators“. College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2425.
Der volle Inhalt der QuelleThesis research directed by: Applied Mathematics and Scientific Computation Program. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Sanchez, Jose Luis Hernandez. „A Study of Dynamics of Coupled Nonlinear Circuits“. Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6984.
Der volle Inhalt der QuelleBitar, Diala. „Collective dynamics of weakly coupled nonlinear periodic structures“. Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCD002/document.
Der volle Inhalt der QuelleAlthough the dynamics of periodic nonlinear lattices was thoroughly investigated in the frequencyand time-space domains, there is a real need to perform profound analysis of the collectivedynamics of such systems in order to identify practical relations with the nonlinear energy localizationphenomenon in terms of modal interactions and bifurcation topologies. The principal goal ofthis thesis consists in exploring the localization phenomenon for modeling the collective dynamicsof periodic arrays of weakly coupled nonlinear resonators.An analytico-numerical model has been developed in order to study the collective dynamics ofa periodic coupled nonlinear oscillators array under simultaneous primary and parametric excitations,where the bifurcation topologies, the modal interactions and the basins of attraction havebeen analyzed. Arrays of coupled pendulums and electrostatically coupled nanobeams under externaland parametric excitations respectively were considered. It is shown that by increasing thenumber of coupled oscillators, the number of multimodal solutions and the distribution of the basinsof attraction of the resonant solutions increase. The model was extended to investigate the collectivedynamics of periodic nonlinear 2D arrays of coupled pendulums and spherical particles underbase excitation, leading to additional features, mainly larger bandwidth and important vibrationalamplitudes. A second investigation of this thesis consists in identifying the solitons associated tothe collective nonlinear dynamics of the considered arrays of periodic structures and the study oftheir stability
Fabiny, Larry. „Dynamics of a coupled solid state laser array“. Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/30509.
Der volle Inhalt der QuelleDoster, Juliane [Verfasser]. „Dynamics of coupled nanomechanical pillar resonators / Juliane Doster“. Konstanz : KOPS Universität Konstanz, 2021. http://d-nb.info/1229727388/34.
Der volle Inhalt der QuelleHernández, José Luis Sánchez. „A study of dynamics of coupled nonlinear circuits“. Available online, Georgia Institute of Technology, 2005, 2004. http://etd.gatech.edu/theses/available/etd-12192004-194550/unrestricted/sanchez%5Fjose%5Fl%5F200505%5Fphd.pdf.
Der volle Inhalt der QuelleFeodor Vainstein, Committee Member ; Dieci Luca, Committee Member ; Yi Yingfei, Committee Member ; Wang Yang, Committee Member ; Shui-Nee, Chow, Committee Chair. Vita. Includes bibliographical references.
Tong, William. „Coupled Rigid Body Dynamics with Application to Diving“. Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/14577.
Der volle Inhalt der QuelleBano, Rakhshinda. „Coupled human-water interactions in formal-informal dynamics“. Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2023. https://ro.ecu.edu.au/theses/2697.
Der volle Inhalt der QuelleHughes, John K. „The dynamic response of the global atmosphere-vegetation coupled system“. Thesis, University of Reading, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397768.
Der volle Inhalt der QuelleHassan, Mohamed. „INELASTIC DYNAMIC BEHAVIOR AND DESIGN OF HYBRID COUPLED WALL SYSTEMS“. Doctoral diss., University of Central Florida, 2004. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4437.
Der volle Inhalt der QuellePh.D.
Department of Civil and Environmental Engineering
Engineering and Computer Science
Civil and Environmental Engineering
Huang, Elaine Annabelle 1981. „Dynamic analysis of concrete coupled wall structures : a parametric study“. Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/31116.
Der volle Inhalt der QuellePages [34]-[104] numbered by hand on odd-numbered p.
Includes bibliographical references (p. 32-33).
Concrete coupled wall structure is a system that can efficiently dissipate energy under the effect of lateral loads. It has been widely used in medium height buildings for several decades. While researchers have conducted both experimental and analytical investigations in order to improve the performance of concrete shear wall, there is a lack of systematic comparison of coupled wall behavior due to variation of parameters. Therefore, this report will carry out a parametric study by varying the height of the building, the degree of coupling (DC), and the shape of the wall piers. A computer-simulated study was carried out on the performance of coupled wall structures. The research process was divided into two phases with the first focusing on only on the shear wall system and the second on the interaction between the building and the core shear wall structure. Static pushover analysis was applied in Phase I, and acceleration response spectrum was employed in Phase II. The comparison of the results from both phases provided valuable insight on the structural behaviors of shear walls. The Phase I results showed that C-shaped coupled wall were more efficient than rectangular wall piers. From further investigation in Phase II, it was found that C-shaped wall with 15 degree opening could achieve the greatest stiffness. Same-size coupling beams could create DC in shorter buildings in Phase I, but the result was contradicted in Phase II testing. However, both Phases displayed the fact that shear stiffness played a more important role in affecting DC than flexural stiffness.
(cont.) Pushover analysis and response spectrum analysis both suggested that the DC of coupled wall structure decreased after concrete cracked and the horizontal force was then withstood by base moment. While concrete shear wall reduced lateral deflection of buildings, Phase II displayed the fact that floor frames could bend and form a sagging shape when interacting with coupled walls in an earthquake. Further study can be focused on more detailed modeling to investigate the behavior of concrete shear walls for efficient and economic design.
by Elaine Annabelle Huang.
M.Eng.
Withee, Jon E. „Fully coupled dynamic analysis of a floating wind turbine system“. Thesis, Monterey, California. Naval Postgraduate School, 2004. http://hdl.handle.net/10945/1471.
Der volle Inhalt der QuelleThe use of wind power is in a period of rapid growth worldwide and wind energy systems have emerged as a promising technology for utilizing offshore wind resources for the large scale generation of electricity Drawing upon the maturity of wind turbine and floater technologies developed by the wind energy and oil and gas industries, respectively, large offshore wind energy systems have been developed and are being proposed for operation in offshore areas where environmental restrictions are less restrictive, large wind resources exist, and open sea areas are available for wind farm development. A fully coupled dynamic analysis/technique was developed to predict the response of a floating wind turbine system in a stochastic wind and wave environment This technique incorporated both non-linear wave loading on the submerged floater and the aerodynamic loading on the wind turbine A tension leg spar buoy was designed to support the wind turbine This design was chosen due to its relatively small size and hence lower potential cost per wind turbine The system's tethers were attached to the ends of spokes which radiated out from the spar cylinder This arrangement of lines and spokes promised to be very stiff in the roll and pitch modes of motion.
Li, Yuwei. „Coupled computational fluid dynamics/multibody dynamics method with application to wind turbine simulations“. Diss., University of Iowa, 2014. https://ir.uiowa.edu/etd/4681.
Der volle Inhalt der QuelleHuynh, Quang-Nghi. „CoModels, engineering dynamic compositions of coupled models to support the simulation of complex systems“. Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066565/document.
Der volle Inhalt der QuelleIntegrated modeling approaches (multi-simulation, multimodeling, etc.) have proven challenging in practice. The first challenge deals with the technical aspects of coupling different computational or mathematical components. The second challenge lies in the alignment of the semantics of these components so that their integration does make sense, which is particularly critical in pluridisciplinary models. A number of approaches have been proposed in the last 20 years but none of them is really suitable to our context . We propose in this thesis an alternate approach, called co-modeling, which borrows concepts and tools from agent-based modeling, agent-oriented software engineering and multimodel ecologies. Simply speaking, a co-model can be defined as a multi-agent system of models and datasets. Each model or dataset is represented by one or several agents interacting with one another within the context of a larger representation of their — potentially dynamic — environment. The proposed approach does not aim at providing a general solution to the two challenges above, but at providing a framework in which modelers can easily implement their solution or test different coupling solutions. The proposed approach is fully implemented within the GAMA agent-based modeling platform. Its advantages are shown in terms of flexibility, composability and reusability in a number of case studies. The first case study is the dynamic coupling of equation-based and agent-based models to obtain “switching” models dynamically. The second one is the design of a complex integrated model where three formalisms and four modeling approaches have been successfully coupled
De, Queiroz Lima Roberta. „Modeling and simulation in nonlinear stochastic dynamic of coupled systems and impact“. Thesis, Paris Est, 2015. http://www.theses.fr/2015PEST1049/document.
Der volle Inhalt der QuelleIn this Thesis, the robust design with an uncertain model of a vibro-impact electromechanical system is done. The electromechanical system is composed of a cart, whose motion is excited by a DC motor (motor with continuous current), and an embarked hammer into this cart. The hammer is connected to the cart by a nonlinear spring component and by a linear damper, so that a relative motion exists between them. A linear flexible barrier, placed outside of the cart, constrains the hammer movements. Due to the relative movement between the hammer and the barrier, impacts can occur between these two elements. The developed model of the system takes into account the influence of the DC motor in the dynamic behavior of the system. Some system parameters are uncertain, such as the stiffness and the damping coefficients of the flexible barrier. The objective of the Thesis is to perform an optimization of this electromechanical system with respect to design parameters in order to maximize the impact power under the constraint that the electric power consumed by the DC motor is lower than a maximum value. To chose the design parameters in the optimization problem, an sensitivity analysis was performed in order to define the most sensitive system parameters. The optimization is formulated in the framework of robust design due to the presence of uncertainties in the model. The probability distributions of random variables are constructed using the Maximum Entropy Principle and statistics of the stochastic response of the system are computed using the Monte Carlo method. The set of nonlinear equations are presented, and an adapted time domain solver is developed. The stochastic nonlinear constrained design optimization problem is solved for different levels of uncertainties, and also for the deterministic case. The results are different and this show the importance of the stochastic modeling
Pade, Jan Philipp. „Synchrony and bifurcations in coupled dynamical systems and effects of time delay“. Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17293.
Der volle Inhalt der QuelleSince a couple of decades, dynamics on networks is a rapidly growing branch of mathematics with applications in various disciplines such as physics, biology or sociology. The functioning of many networks heavily relies on the ability to synchronize the network’s nodes. More precisely, the existence and the transverse stability of the synchronous manifold are essential properties. It was only in the last few years that people tried to understand the entangled relation between the coupling structure of a network, given by a (di-)graph, and the stability properties of synchronous states. This is the central theme of this dissertation. I first present results towards a classification of the links in a directed, diffusive network according to their impact on the stability of synchronization. Then I investigate a complex bifurcation scenario observed in a directed ring of Stuart-Landau oscillators. I show that under the addition of a single weak link, this scenario is persistent. Subsequently, I investigate synchronous patterns in a directed ring of phase oscillators coupled with time delay. I discuss the coexistence of multiple of synchronous solutions and investigate their stability and bifurcations. I apply these results by showing that a certain time-shift transformation can be used in order to employ the ring as a pattern recognition device. Next, I investigate the same time-shift transformation for arbitrary coupling structures in a very general setting. I show that invariant manifolds of the flow together with their stability properties are conserved under the time-shift transformation. Furthermore, I determine the minimal number of delays needed to equivalently describe the system’s dynamics. Finally, I investigate a peculiar phenomenon of non-continuous transition to synchrony observed in certain classes of large random networks, generalizing a recently introduced approach for the description of large random networks to the case of delayed couplings.
Swanepoel, Pieter Frederick Renier. „Dynamic compensation for performance characteristic differences of wind generator coupled pumps“. Thesis, Port Elizabeth Technikon, 2000. http://hdl.handle.net/10948/25.
Der volle Inhalt der QuelleChaker, Driss. „Effect of building height on dynamic inelastic response of coupled walls“. Thesis, University of Ottawa (Canada), 1990. http://hdl.handle.net/10393/5653.
Der volle Inhalt der QuelleSo, Richard Hau Yue. „Optimising the response of head-coupled systems to dynamic head movements“. Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261967.
Der volle Inhalt der QuelleMeng, Jiulong. „Coupled wave propagation in a rod with a dynamic absorber layer“. Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/38719.
Der volle Inhalt der QuelleMartone, Giovanni Italo. „Static and dynamic properties of spin-orbit-coupled Bose-Einstein condensates“. Doctoral thesis, Università degli studi di Trento, 2014. https://hdl.handle.net/11572/367751.
Der volle Inhalt der QuelleMartone, Giovanni Italo. „Static and dynamic properties of spin-orbit-coupled Bose-Einstein condensates“. Doctoral thesis, University of Trento, 2014. http://eprints-phd.biblio.unitn.it/1365/1/Martone_thesis.pdf.
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