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Letteratura scientifica selezionata sul tema "Couple dynamic"

Autore: Grafiati

Pubblicato: 24 agosto 2024

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Articoli di riviste sul tema "Couple dynamic"

Pitti, Mary, e Michael Matheny. "Odd Couple? Or Dynamic Duo?" ASHA Leader 21, n. 6 (giugno 2016): 38–39. http://dx.doi.org/10.1044/leader.ae.21062016.38.

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L’Abate, Luciano. "Dynamic Assessment in Couple Therapy". American Journal of Psychotherapy 48, n. 2 (aprile 1994): 312–13. http://dx.doi.org/10.1176/appi.psychotherapy.1994.48.2.312.

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Lin, Jaw-Ren, Yeon-Pun, Yuan Kang e Kuo-Chiang Cha. "PURE SQUEEZE FILM BEHAVIOR OF LONG JOURNAL BEARINGS WITH COUPLE STRESS FLUIDS UNDER DYNAMIC LOADING". Transactions of the Canadian Society for Mechanical Engineering 24, n. 3-4 (settembre 2000): 477–92. http://dx.doi.org/10.1139/tcsme-2000-0036.

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On the basis of microcontinuum theory, a theoretical analysis of pure squeeze film behavior of journal bearings with couple stress lubricants operating under a dynamic load is presented. To account for the effects of couple stresses arising from the lubricant blended with various additives, the modified Reynolds equation governing the film pressure is obtained from Stokes equations of motion. Various bearing characteristics for long bearings are then calculated. According to the results obtained, the influence of couple stresses on the dynamic squeeze film motion is apparent and not negligible. Comparing with the Newtonian-lubricant case, the effects of coupe stresses provide and enhancement in the film pressure as well as a reduction in the velocity of the journal center; consequently, the maximum eccentricity ratio of the journal center is decreased. On the whole, the bearing lubricated with couple stress fluid signifies and improvement in the dynamic squeeze film performance and results in longer bearing life.

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Talabi, Adetoro Temitope, Victor Uzodinma Chukwuma e Rasaki Kolawole Odunaike. "MODIFIED NONLINEAR DYNAMICAL EQUATIONS FOR RELATIONSHIP IN MARRIAGES". African Journal of Science and Nature 7 (6 novembre 2020): 50. http://dx.doi.org/10.46881/ajsn.v7i0.156.

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Love-stories are characterized by temporal fluctuations, experiment in the area of relationship are difficult to design but mathematical models play vital role in studying the dynamics of relationships and their behavioural features. The paper examines relationship between different couples who are living together as ideal couple or fragile couple and the divorcee. A modified nonlinear coupled dynamic model was used to predict and interpret the feature of the union of different individuals and it is adapted to local environment where the data collection is carried out. We also investigated several measures affecting marriages, different challenges in marriage were considered by the use of questionnaires, analyzed and the results were applied as parameters in the model. In other words, only few of the behaviour of the couples to each other are taken into account while the rest of the answers were kept frozen, results were used to confirm if the behaviour of certain number of individuals observed in real life can be explained through the answers provided by individuals in the survey which was included in the theory. Numerical simulations are also presented to show the effectiveness of the survey results.

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Zeng, S., BL Wang e KF Wang. "Analyses of natural frequency and electromechanical behavior of flexoelectric cylindrical nanoshells under modified couple stress theory". Journal of Vibration and Control 25, n. 3 (26 luglio 2018): 559–70. http://dx.doi.org/10.1177/1077546318788925.

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Different from piezoelectric effect, the flexoelectric effect is size dependent and becomes more significant at nanoscale. A nonlinear dynamic model of nanoscale flexoelectric shells is developed based on modified couples stress theory. The governing equations for nonlinear vibration of a flexoelectric cylindrical nanoshell are obtained. The natural frequency and generated voltage of the flexoelectric cylindrical nanoshell is achieved. Effects of geometric dimension, character material length, and vibration amplitude on the natural frequency and the generated voltage are discussed in detail. Results demonstrate that modified couple stress theory and large deformation theory are coupled together and interact with each other in the analyses of natural frequency and electromechanical behavior. Simultaneously taking nonlinearity and couple stress theory into account is necessary.

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Talbot, Wendy. "Humor in Couple Relationships: An Opportunity for Therapeutic Inquiry". Journal of Systemic Therapies 40, n. 1 (maggio 2021): 1–16. http://dx.doi.org/10.1521/jsyt.2021.40.1.1.

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Humor has been a focus of therapy literature for over a century and is considered an essential communication tool and important component of therapeutic relationships. Yet couple therapy literature does not feature humor as a relational practice or strategy for couples’ relationship development. When humor presents in a therapy conversation it offers opportunities for therapists to explore the implications and meanings for the couple relationship, potentially contributing to new and enhanced relationship experience. This article provides vignettes from one couple therapy conversation to illustrate therapeutic possibilities for exploration of couples’ humor. Therapists are encouraged to pay attention to humor as a complex, dynamic, discursive practice with therapeutic benefits for couples’ therapy.

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Jacques, Glenys. "The Dynamic Flow of the Couple". Self & Society 33, n. 5 (marzo 2006): 41–43. http://dx.doi.org/10.1080/03060497.2006.11086270.

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V, Giridharan, e Sivakumar S. "Effect of Gyroscopic Couple on Aircraft Landing Gear Shimmy". Defence Science Journal 73, n. 06 (1 novembre 2023): 627–32. http://dx.doi.org/10.14429/dsj.73.18932.

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This article presents the effect of gyroscopic couples on the shimmy response of landing gear. The gyroscopic effect between the rotational motions of the aircraft’s longitudinal and vertical axes may be one of the causes of shimmy. The vertical load acting on the wheel axle plays a significant role in a tire’s dynamic characteristics, which may influence shimmy oscillation. So, vertical dynamics also need to be considered for shimmy analysis along with lateral and torsional modes. Suitable mathematical models are required to study the system’s shimmy oscillation and stability nature. The mathematical model was developed by introducing a gyroscopic couple with 5 degrees of freedom (DOF). A numeric analysis was made to investigate the influence of gyroscopic couples on the landing gear model. The simulation results of the model with and without gyroscopic couple are compared and the effect of each parameter on shimmy is studied.

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Pineda, J. R. E. T., e S. D. Schwartz. "Protein dynamics and catalysis: the problems of transition state theory and the subtlety of dynamic control". Philosophical Transactions of the Royal Society B: Biological Sciences 361, n. 1472 (12 luglio 2006): 1433–38. http://dx.doi.org/10.1098/rstb.2006.1877.

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This manuscript describes ongoing research on the nature of chemical reactions in enzymes. We will investigate how protein dynamics can couple to chemical reaction in an enzyme. We first investigate in some detail why transition state theory cannot fully describe the dynamics of chemical reactions catalysed by enzymes. We describe quantum theories of chemical reaction in condensed phase including studies of how the symmetry of coupled vibrational modes differentially affects reaction dynamics. We make reference to previous work in our group on a variety of condensed phase chemical reactions (liquid and crystalline) and a variety of enzymatically catalysed reactions including the reactions of lactate dehydrogenase and purine nucleoside phosphorylase. All the protein motions we have studied have been quite rapid. We will propose methods to find motions over a broad range of time-scales in enzymes that couple to chemical catalysis. We report recent findings which show that conformational fluctuations in lactate dehydrogenase can strongly affect its ability to catalyse reactions through protein motion, and that only a tiny minority of conformations appear to be catalytically competent.

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Li, Din Geng, Ji Guang Cao, Jun Wen Wang e Chuan Yao Chen. "The Design and Analysis of a New Type of Vibration Structure". Applied Mechanics and Materials 1-2 (settembre 2004): 71–80. http://dx.doi.org/10.4028/www.scientific.net/amm.1-2.71.

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In this paper, a new type of vibration structure (i.e. swing frame) of vertical dynamic balancing machine is designed, which is based on the analysis of traditional double-plane vertical dynamic balancing machine’s swing frame. The static unbalance and couple unbalance can be separated effectively by using the new dynamic balancing machine with the new swing frame. The modal and harmonic responses are analyzed by using the ANSYS7.0. By comparing the finite element modal analysis with the experimental modal analysis, the natural frequencies and vibration modes are found out, which can provide the dynamics direction for designing vertical dynamic balancing machine. The new dynamic balancing machine can measure static unbalance and couple unbalance directly, and the influence between them is faint. The practical result indicates that the new vertical dynamic balancing machine is suitable for inertial measurement of flying objects, and can overcome the shortcomings of traditional double-plane vertical dynamic balancing machines, in which the effect of plane-separation is inferior. The vertical dynamic balancing machine with the new vibration structure can be widely used in the future application.

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Più fonti

Tesi sul tema "Couple dynamic"

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.

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Les maladies neuroévolutives (MNE) soulèvent de nombreuses implications pour la santé, le bien-être et la qualité de vie des personnes malades et de leur conjoint·e. Face à ces défis, de nombreuses études ont cherché à comprendre le vécu de ces personnes et à évaluer l'efficacité d'interventions centrées sur le bien-être. Si ces approches individuelles sont importantes, la littérature a souligné l'importance de considérer la dyade et les processus relationnels en jeu, notamment pour optimiser ces accompagnements. Or, si de nombreux modèles détaillent la façon dont le couple peut s'ajuster à une maladie chronique, hormis quelques exceptions, les MNE n'y sont pas intégrées. Cela soulève le besoin de s'intéresser davantage au fonctionnement du couple dans le cadre des MNE. Ces travaux de thèse avaient donc pour objectifs de mieux comprendre le vécu des couples et les processus dyadiques sous-jacents à leur fonctionnement, en réalisant tout d'abord une méta-synthèse centrée sur diverses MNE (étude 1), puis deux études centrées sur la maladie de Parkinson (MP) (études 2 et 3). Saisir les changements dans le fonctionnement du couple à travers différents temps de la maladie était un autre objectif. Une synthèse thématique (étude 1) et deux études empiriques qualitatives utilisant une Analyse Interprétative Phénoménologique (étude 2 et 3) ont été réalisées. L'étude 2 explorait le vécu de 15 couples au stade spécifique dit de lune de miel de la MP. L'étude 3 consistait en une mise en parallèle des processus identifiés dans trois échantillons distincts de 15 couples, à trois temps de la MP, afin d'identifier les patterns de fonctionnement prévalents et les transitions dans la dynamique des couples au fil de l'évolution de la maladie. Les études 2 et 3 ont identifié cinq patterns de fonctionnement dyadique, ainsi que des transitions dans la dynamique conjugale, souvent liées à l'évolution des symptômes. Certains partenaires font preuve de soutien mutuel et de réinterprétation positive de leur expérience, ce fonctionnement évoluant vers une dynamique où l'aidant·e apporte une aide subtile pour tenter de préserver cet équilibre. Pour d'autres, cette aide discrète, d'emblée source de négociations au sein du couple, se transforme brutalement en contrôle. Alors que certains conjoint·e·s luttent contre la maladie dès les premiers stades, en exerçant une forme de contrôle, leur partenaire se désengage. Avec l'évolution des symptômes, il n'est plus possible d'éviter ce contrôle qui se transforme en intrusion. De plus, d'autres couples adoptent une hyperprotection rigide face à la détresse induite par la MP, cet évitement se renforçant avec le temps. Enfin, un autre pattern, caractérisé par une difficulté à comprendre la perspective de l'autre et un désengagement mutuel des partenaires, se rigidifie également avec l'évolution de la MP, ce fonctionnement pouvant aboutir à une remise en question de la relation de couple. Ces études ont mis en évidence différentes dynamiques conjugales et plusieurs processus associés dans le cadre des MNE et plus précisément la MP. Les transitions identifiées dans le fonctionnement du couple au fil de l'évolution de la maladie montrent qu'il est important de considérer le vécu du couple dès le début de la maladie et durant son entièreté. Ces travaux sont importants puisqu'ils suggèrent plusieurs types du fonctionnement dyadique face aux MNE. De plus, ils relèvent des similitudes dans les processus observés dans le cadre de la MP, de la maladie d'Alzheimer ou d'autres maladies chroniques. Ces différents aspects sont donc importants pour la création d'interventions transdiagnostiques et de futures recherches visant à explorer les processus dyadiques associés au vécu du couple face à d'autres maladies moins étudiées
Neurodegenerative 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

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Meguenani, Anis. "Safe control of robotic manipulators in dynamic contexts". Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066420/document.

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L'objectif de cette thèse est d'explorer de nouvelles approches pour le développement de systèmes robotiques capables de partager en toute sécurité leur espace de travail avec des opérateurs humains. Dans ce contexte, le travail présenté est axé principalement sur la problématique de commande. Les questions suivantes sont abordées:- pour des lois de contrôle réactives, c'est-à-dire des problèmes de commande où la tâche à exécuter n'est pas connue à l'avance mais découverte en temps réel, comment est-il possible de garantir à chaque pâs de temps l'existence d'une solution au problème de contrôle? Cette solution devrait permettre au robot d'accomplir au mieux sa tâche préscrite et en même temps de strictement respecter les contraintes existantes, parmi lesquelles, les contraintes liées aux limitations physiques des actionneurs de ses articulations.- Comment intégrer l'opérateur humain dans la boucle de contrôle du robot de manière à ce que le contact physique puisse être engagé et désengagé en toute sécurité? Concernant le premier point, notre travail se présente comme la continuité de résultats antérieurs développés par Sébastien Rubrecht lors de sa thèse de doctorat. Sébastien Rubrecht a introduit le concept d'incompatibilité des contraintes pour des robots contrôlés de manière réactive au niveau cinématique. Le problème de l'incompatibilité des contraintes apparaît par exemple lorsque la formulation de la contrainte sur une position articulaire d'un robot ne tient pas compte de la quantité de décélération produite par son actionneur. Dans ce cas, si la contrainte de position articulaire est activée tardivement, le système peut se retrouver dans une situation où il n'a pas suffisamment de temps pour faire face à la limite de position articulaire imposée considérant ses capacités dynamiques limités
The 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

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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.

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Cette thèse étudie les forces potentielles des mécanismes parallèles plans à deux degrés de liberté équipés d'embrayages de sécurité (limiteur de couple). Les forces potentielles sont étudiées sur la base des matrices jacobienne. La force maximale qui peut être appliquée à l'effecteur en fonction des limiteurs de couple ainsi que la force maximale isotrope sont déterminées. Le rapport entre ces deux forces est appelé l'efficacité de la force et peut être considéré ; comme un indice de performance. Enfin, les résultats numériques proposés donnent un aperçu sur la conception de robots coopératifs reposant sur des architectures parallèles. En isolant chaque lien, les modèles dynamiques approximatifs sont obtenus à partir de l'approche Newton-Euler et des équations de Lagrange pour du tripteron et du quadrupteron. La plage de l'accélération de l'effecteur et de la force externe autorisée peut être trouvée pour une plage donnée de forces d'actionnement.
This 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.

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Tan, Yang. "Transitions continues des tâches et des contraintes pour le contrôle de robots". Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066096/document.

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Lors du contrôle de robots, les variations fortes et soudaines dans les couples de commande doivent impérativement être évitées. En effet ces discontinuités peuvent entraîner, en plus des comportements imprévisibles du système, des dommages physiques, notamment au niveau des actionneurs. Pour la réalisation de tâches complexes, un robot à plusieurs degrés de liberté utilise généralement un système de commande multi-objectif avec lequel plusieurs tâches doivent être réalisées et plusieurs contraintes respectées. Le basculement entre ces différentes tâches ainsi que les contraintes causées par un environnemt dynamique et imprévisible sont les causes directes des variations fortes dans les couples de commande. Dans ce travail, les problèmes de transitions de priorités entre les différentes tâches ainsi que la variation des contraintes sont considérées avec pour objectif la des variations fortes dans les couples de commande. Deux contributions principales ont été réalisées.Premièrement, un nouveau contrôleur appelé "contrôle hiérarchique généralisé (GHC)" est implémenté sous forme d’optimisation quadratique pour gérer la priorité des transitions entre les tâches de poids différents. Le projecteur utilisé assure en plus de la continuité des transitions, la gestion de l’ajout et/ou de la suppression de tâches. Les couples de commande sont alors calculés en résolvant un problème d’optimisation prenant en compte en même temps la hiérarchie des tâches et les contraintes égalitaire et inégalitaires.Deuxièmement, nous avons développé une primitive de contrôle à base de Contrôle par Modèle Prédictif (CMP) afin de gérer l’existence des discontinuités des contraintes que doit respecter le robot, tel que le changement d’état des contacts ou l’évitement d'obstacles. Le contrôleur profite ainsi de la formulation prédictive en anticipant l'évolution des contraintes vis-à-vis des scénarios de commande et/ou de l'information des capteurs. Il permet de générer des nouvelles contraintes continues qui remplacent les anciennes contraintes discrètes dans le contrôleur réactif QP. Par conséquent, le taux de changement des couples articulaires est minimisé, comparé aux anciennes contraintes discrètes. Cette primitive de contrôle prédictive ne modifie pas directement les objectifs désirés des tâches mais les contraintes, ce qui permet de s’assurer que les changements de couple sont bien gérés dans les pires scénarios.L'efficacité de la stratégie de contrôle proposée est validée via des expériences en simulation avec le robot Kuka LWR 4+ et le robot humanoïde iCub. Les résultats montrent que l'approche développée peut réduire de manière significative la variation des couples articulaires pendant les changements de priorité des tâches ou sous contraintes discrètes
Large 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

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Dunton, Alec. "Topological Data Analysis for Systems of Coupled Oscillators". Scholarship @ Claremont, 2016. http://scholarship.claremont.edu/hmc_theses/79.

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Coupled oscillators, such as groups of fireflies or clusters of neurons, are found throughout nature and are frequently modeled in the applied mathematics literature. Earlier work by Kuramoto, Strogatz, and others has led to a deep understanding of the emergent behavior of systems of such oscillators using traditional dynamical systems methods. In this project we outline the application of techniques from topological data analysis to understanding the dynamics of systems of coupled oscillators. This includes the examination of partitions, partial synchronization, and attractors. By looking for clustering in a data space consisting of the phase change of oscillators over a set of time delays we hope to reconstruct attractors and identify members of these clusters.

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Gu, Bei 1970. "Co-simulation of algebraically coupled dynamic subsystems". Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8695.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001.
Includes 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.

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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.

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Oliviero, Mattia. "Fertility Decisions in Context - Individual and Couple Dynamics". Doctoral thesis, Università degli studi di Trento, 2019. http://hdl.handle.net/11572/243214.

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This thesis contributes to enhance our knowledge on fertility decisions by addressing two major issues. First, it contributes to the understanding of the factors behind the differences in fertility levels among European countries by adopting a holistic perspective. Second, it adds to the fertility topic by examining the whole fertility decision-making process using a dyadic and a life-course perspective to address the ‘fertility gap’ that exists between desired family size and the actual number of children. In order to provide these contributions, this thesis is structured as follows. After a detailed review of the literature, major attention is dedicated to the analysis of the differences in terms of fertility levels between the European countries (Chapter 2). Chapter 3 investigates the fertility decision-making process exploiting the unique information of HILDA, which allows for a dyadic as well as longitudinal analysis of the overall process. The last chapter examines in-depth the transition to parenthood among couples of diverse ethnic origins in Australia.

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Oliviero, Mattia. "Fertility Decisions in Context - Individual and Couple Dynamics". Doctoral thesis, Università degli studi di Trento, 2019. http://hdl.handle.net/11572/243214.

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Sun, Hongyan. "Coupled nonlinear dynamical systems". Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1636.

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Thesis (Ph. D.)--West Virginia University, 2000.
Title from document title page. Document formatted into pages; contains xi, 113 p. : ill. (some col.). Includes abstract. Includes bibliographical references.

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Libri sul tema "Couple dynamic"

P, Gillespie Joseph, e Stahmann Robert F, a cura di. Dynamic assessment in couple therapy. New York: Lexington Books, 1993.

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Willi, Jürg. Dynamics of couples therapy: Understanding the potential of the couple-therapist triangle. Claremont, CA: Hunter House, 1986.

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Willi, Jürg. Dynamics of couples therapy: Understanding the potential of the couple/therapist triangle. San Bernardino, Calif: Borgo Press, 1989.

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Zeng, Yijian. Coupled Dynamics in Soil. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-34073-4.

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Zhai, Wanming. Vehicle–Track Coupled Dynamics. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-32-9283-3.

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Linderholt, Andreas, Matthew S. Allen, Randall L. Mayes e Daniel Rixen, a cura di. Dynamics of Coupled Structures, Volume 4. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74654-8.

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Allen, Matt, Randy Mayes e Daniel Rixen, a cura di. Dynamics of Coupled Structures, Volume 1. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04501-6.

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Allen, Matt, Randall L. Mayes e Daniel Rixen, a cura di. Dynamics of Coupled Structures, Volume 4. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29763-7.

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Allen, Matthew S., Randall L. Mayes e Daniel Jean Rixen, a cura di. Dynamics of Coupled Structures, Volume 4. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54930-9.

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Okuno, Takaya. Magnetic Dynamics in Antiferromagnetically-Coupled Ferrimagnets. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-9176-1.

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Capitoli di libri sul tema "Couple dynamic"

Arirajan, K. A., M. Shunmathi e K. Chockalingam. "Selection of Contact Bearing Couple Materials for Hip Prosthesis Using Finite Element Analysis Under Dynamic Loading Conditions". In Lecture Notes in Mechanical Engineering, 39–50. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-3895-5_3.

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Ganong, Lawrence H., e Marilyn Coleman. "Couple Dynamics in Stepfamilies". In Stepfamily Relationships, 75–97. Boston, MA: Springer US, 2004. http://dx.doi.org/10.1007/978-1-4419-9112-6_5.

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Ganong, Lawrence, e Marilyn Coleman. "Couple Dynamics in Stepfamilies". In Stepfamily Relationships, 85–110. Boston, MA: Springer US, 2016. http://dx.doi.org/10.1007/978-1-4899-7702-1_5.

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Drabble, G. E. "Coupled and Geared Systems". In Dynamics, 295–338. London: Macmillan Education UK, 1990. http://dx.doi.org/10.1007/978-1-349-10448-2_9.

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Le Goff, Jean-Marie, Valérie-Anne Ryser e Laura Bernardi. "Subjective Well-Being, Family Dynamics and Vulnerability". In Withstanding Vulnerability throughout Adult Life, 17–29. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-4567-0_2.

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AbstractThere is a wealth of empirical studies linking the life events and transitions to variations in subjective wellbeing. These studies are often cross sectional or, when taking a dynamic approach, they address one life domain at the time. Within LIVES, the relationship between family transitions (like the transition to parenthood, couple separation, lone motherhood) and well-being has been investigated longitudinally and with attention to the spillovers between the family and other life domains. Several projects show the extent to which family events or phases affect individual subjective wellbeing in the short or long term and what are the interdependencies with employment and health trajectories. Results show also gender differences in the way different types of stressors act and are reacted to. For instance, men and women have different strategies and mobilize different resources and reserves drawing on various life domains (economic, social, cognitive) to deal with stressors related to critical events and transitions. In this chapter, we review and discuss the results of such projects (becoming a parent study, lone motherhood project, etc.) in the light of a multidimensional understanding of vulnerability processes across the life course.

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Fieguth, Paul. "Nonlinear Dynamic Systems: Coupled". In An Introduction to Complex Systems, 135–68. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-44606-6_7.

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Fieguth, Paul. "Nonlinear Dynamic Systems—Coupled". In An Introduction to Complex Systems, 143–86. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63168-0_7.

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Le, Khanh Chau, e Lu Trong Khiem Nguyen. "Coupled Oscillators". In Energy Methods in Dynamics, 45–98. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-05419-3_2.

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Le, Khanh Chau, e Lu Trong Khiem Nguyen. "Coupled Oscillators". In Energy Methods in Dynamics, 297–342. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-05419-3_7.

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Le, Khanh Chau. "Coupled Oscillators". In Energy Methods in Dynamics, 35–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22404-1_2.

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Atti di convegni sul tema "Couple dynamic"

Peng, Cheng, Fasuo Yan e Jun Zhang. "Coupled Dynamic Response of a Spar Type Floating Offshore Wind Turbine". In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23560.

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FOWTs (Floating Offshore Wind Turbine) are feasible renewable devices to harness the wind energy in the near future. However, because of the complicated interactions among wind turbine, mooring system and the hull, the motion of a FOWT under the impact of severe wind, wave and current has not been well studied yet. This research focuses on the coupled numerical analysis of a FOWT. A numerical code COUPLE-FAST is developed by integrating two existing codes, namely, COUPLE and FAST, to carry out the task. In this study, a particular FOWT model is chosen for the numerical simulation, which consists of a NREL 5-MW baseline wind turbine and OC3-Hywind Spar. Although the numerical simulation is limited to this particular type of FOWTs, the results and related code (COUPLE-FAST) may be helpful to the design of FOWTs in the future.

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Heshmat, Hooshang, James F. Walton e Crystal A. Heshmat. "On the Coupling of Foil Bearing Supported Rotors: Part 1 — Analysis". In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27821.

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The expanded application of high-speed rotor systems operating on compliant foil bearings will be greatly enhanced with the ability to adequately couple multiple shaft systems with differing bearing systems and dynamic performance. In this paper the results of an analytical tradeoff study assessing coupling dynamic characteristics and their impact on coupled rotor-bearing system dynamics are presented. This analysis effort was completed in an effort to establish the form of characteristics needed to couple foil bearing supported rotors to ball bearing supported rotors, other foil bearing supported rotors as well as coupling rigid and flexible rotors both supported on foil bearings. The conclusions from this study indicate that with appropriate coupling design, a wide array of foil bearing supported rotor systems may be successfully coupled.

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Xia, Wei, James Gibson, Bo Xiao, Brian Baucom e Panayiotis G. Georgiou. "A dynamic model for behavioral analysis of couple interactions using acoustic features". In Interspeech 2015. ISCA: ISCA, 2015. http://dx.doi.org/10.21437/interspeech.2015-431.

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De Santiago, Oscar, e Luis San Andrés. "Dynamic Response of a Rotor-Integral Squeeze Film Damper to Couple Imbalances". In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0388.

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Squeeze film dampers (SFDs) are used in high speed rotating machinery to reduce rotor vibration amplitudes and to isolate transmitted loads through the bearing support structures. SFDs are also effective means to ameliorate destructive subsynchronous vibrations excited by hydrodynamic bearings, seals, impellers and other unknown sources. Modern jet engines demand lighter and flexible structures with compact components to obtain the largest power to weight ratios. This current trend makes evident rotordynamic phenomena that must be adequately addressed by dissipation elements such as SFDs. Integral squeeze film dampers (ISFDs) incorporating built in elastic supports are of reduced weight and length, offer accuracy of positioning, and a split segment construction allowing easier assembly, inspection and retrofit. Yet ISFDs require of extensive experimentation to verify their dynamic forced performance and to prove their reliability for applications on high performance turbomachinery. Measurements of the synchronous response of a test rotor supported on ISFDs and due to couple-imbalances are hereby presented. Masses inserted at two axial planes in the rotor and out of phase by 180° excite the second (conical) mode of vibration of the test rotor. Peak rotor responses at the second critical speeds, vertical and horizontal, allow the determination of amplification factors from which system damping coefficients for the rotor conical motions are extracted. The measurements verify the damping capacity of ISFDs to reduce (conical mode) rotor vibrations.

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Pol, P. Santamarina. "Dynamic and Static Design of Engine Test Benches". In ASME 1991 Design Technical Conferences. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/detc1991-0306.

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Abstract The elastic mechanical strength of the large and medium reciprocating engine test benches, is calculated for vertical and horizontal bendings and for torsion. The dynamic loads - horizontal vibrating forces and vertical vibrating couples (bending and torsion) and horizontal vibrating couple,- and the static loads, - distributed weight of the bench itself and the machinery and the motor torque (torsion), - are analyzed. It is pointed out that the bench body of reinforced concrete is submitted to bending moments and shearing forces and to torsion couples. This paper is the continuation of the paper “Dynamic Loads in Engine Test Benches” in 12th Biennial ASME Conference on Mechanical Vibration and Noise.

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Bashmal, S. "Static and Dynamic Analysis of Microcantilever Beam Under Electrical Loading Using Couple Stress Theory". In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64674.

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This study presents an electro-mechanical analysis of a microcantilever beam considering the effect of size dependence and flexible supports. The energy expressions are derived using couple stress theory, while additional energy terms were added to represent the flexible boundaries and fringing fields. Both static and dynamic analyses are performed to show the coupled effect of flexible support, electrical voltage and mechanical loading on the static and dynamic performance of the microcantilever beam.

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Chen, Xiaohong, Jun Zhang, Pierre-Yves F. Liagne, John M. Niedzwecki e Per Teigen. "Coupled Dynamic Analysis of a Mini TLP: Comparison With Measurements". In ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/omae2002-28536.

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A numerical code (COUPLE) was recently developed for computing 6 Degree-Of-Freedom (DOF) motions of a moored floating structure dynamically interacting with its mooring/riser/tendon system. The computation of hydrodynamic forces on the moored structure can be conducted based on a diffraction wave theory model, e.g. WAMIT, and/or the Morison Equation based upon a slender body assumption. Wave kinematics up to the free surface, used in the Morison Equation, is computed using nonlinear deterministic Hybrid Wave Models, and is accurate up to second order in wave steepness. Experimental data from the model tests of a mini TLP was used as the basis for investigation of the numerical computation. Using COUPLE and its alternatives, coupled as well as quasi-static analyses were conducted for the mini TLP model that incorporates four risers and four tendons. Two different methods for computing hydrodynamic loads, namely, WAMIT and Morison Equation, were used, respectively. Through the comparison between the numerical results and the corresponding measurements, dynamic interactions between the riser/tendon system and the hull were examined. Findings made in this study, though based upon a mini TLP may have valuable applications to the design and simulation of a wide range of compliant deep-water structures.

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Armstrong, Ashley, Amy Wagoner Johnson e Andrew Alleyne. "Improved Cross-Coupled Iterative Learning Control for Contouring NURBS Curves". In ASME 2018 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/dscc2018-9145.

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Additive manufacturing (AM) uses computer-aided design to construct parts layer by layer. Relative to traditional manufacturing processes, AM provides a time-efficient and cost-effective way to produce low-volume, customized parts with complex geometries. This work presents an improved Cross-Coupled iterative learning control (CCILC) scheme to overcome current limitations in contour following for complex, free-form curves in AM. The approach involves modifying the definition of the error vector used in the individual axis iterative learning controllers and defining time varying weightings based on the curvature of the reference trajectory to couple tracking and contour errors. In this paper, the design for the improved CCILC system is presented, and the performance of this system is compared to the performance of existing ILC control schemes via simulations. In comparison to the current control methods, the simulation results demonstrate significant performance improvements for contour tracking of a reference trajectory with high levels of curvature.

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Barton, Kira, David Hoelzle, Andrew Alleyne e Amy Wagoner Johnson. "Cross Coupled Iterative Learning Control of Dissimilar Dynamical Systems". In ASME 2009 Dynamic Systems and Control Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/dscc2009-2727.

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Cross Coupled Iterative Learning Control (CCILC) has previously been applied to contour tracking problems with planar robots in which both axes can be characterized as similar systems; having similar dynamics and identical hardware. However, there are many repetitive applications in which dissimilar systems cooperate to pursue a primary performance objective. This paper introduces a novel framework to couple dissimilar systems while applying Iterative Learning Control (ILC), showing the ability to noncausally compensate for a slow system with a fast system. In this framework, performance requirements for a primary objective can more readily be achieved by emphasizing an underutilized fast system instead of straining a less-capable slow system. The controller is applied in simulation and experimentally to a micro-Robotic Deposition (μRD) manufacturing system to coordinate a slow extrusion system axis and a fast positioning system axis to pursue the primary performance objective, dimensional accuracy of a fabricated part. Experimental results show a 30% improvement in fabrication dimensional accuracy with only marginal changes in actuator effort in the slow system, as compared to independently controlled axes.

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Nessler, Jeff A., Winsean Lin e Yasin Dhaher. "Synergistic Moments at the Hip and Knee Joints Are Altered in Post-Stroke Hemiplegic Gait". In ASME 2007 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2007. http://dx.doi.org/10.1115/sbc2007-175864.

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Following stroke, many patients are unable to adequately bend their knee during the swing phase of gait [1,2]. This loss of functional control may be related to an abnormal muscle synergy or torque couple in the lower limb, similar to those reported for the upper extremity [3–5]. For example, several investigators have described a flexor synergy that couples shoulder abduction torque and elbow flexion torque under static, isometric conditions [3–4]. This couple is typically altered following stroke [3–4]. In the lower extremity, hip kinetics in the frontal plane appear to be coupled with knee kinetics in the sagittal plane for static, isometric conditions [6]. It is unknown, however, whether the same relationship holds for hip and knee kinetics under dynamic conditions, such as during the swing phase of gait.

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Rapporti di organizzazioni sul tema "Couple dynamic"

Seo, Hyodae. Predictability and Coupled Dynamics of MJO During DYNAMO. Fort Belvoir, VA: Defense Technical Information Center, settembre 2013. http://dx.doi.org/10.21236/ada597934.

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Miller, Arthur J. Predictability and Coupled Dynamics of MJO During DYNAMO. Fort Belvoir, VA: Defense Technical Information Center, settembre 2013. http://dx.doi.org/10.21236/ada598802.

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Roy, Rajarshi. Nonlinear Dynamics of Coupled Laser Systems. Fort Belvoir, VA: Defense Technical Information Center, ottobre 1997. http://dx.doi.org/10.21236/ada330680.

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Grossman, R., P. S. Krishnaprasad e Jerrold E. Marsden. The Dynamics of Two Coupled Rigid Bodies,. Fort Belvoir, VA: Defense Technical Information Center, ottobre 1987. http://dx.doi.org/10.21236/ada187592.

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Ginn, Timothy R., Ellyn M. Murphy, Madilyn M. Fletcher e Jonh H. Cushman. Dynamics of Coupled Microbial and Contaminant Transport. Office of Scientific and Technical Information (OSTI), giugno 2000. http://dx.doi.org/10.2172/827042.

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Berkemeier, Matthew D. Coupled Oscillator Control of a Dynamic Four-Legged Robot. Fort Belvoir, VA: Defense Technical Information Center, agosto 1995. http://dx.doi.org/10.21236/ada310557.

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Swanson, Jessica. CHARACTERIZING COUPLED CHARGE TRANSPORT WITH MULTISCALE MOLECULAR DYNAMICS. Office of Scientific and Technical Information (OSTI), agosto 2011. http://dx.doi.org/10.2172/1164073.

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Murtugudde, Ragu, Hyodae Seo e Markus Jochum. Coupled Ocean-Atmosphere Dynamics and Predictability of MJO's. Fort Belvoir, VA: Defense Technical Information Center, settembre 2010. http://dx.doi.org/10.21236/ada542738.

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Accorsi, Michael L., e John W. Leonard. Advanced Structural Modeling for Fully Coupled Parachute Dynamics. Fort Belvoir, VA: Defense Technical Information Center, agosto 2002. http://dx.doi.org/10.21236/ada413498.

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Seo, Hyodae. Coupled Ocean-Atmosphere Dynamics and Predictability of MJO's. Fort Belvoir, VA: Defense Technical Information Center, settembre 2012. http://dx.doi.org/10.21236/ada574079.

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