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Littérature scientifique sur le sujet « Synchronous dynamics »

Auteur : Grafiati

Publié le 10 mars 2023

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Articles de revues sur le sujet "Synchronous dynamics"

Li, Yi Min, Zhi Yong Hao et Jin Li. « Analysis and Research of Dynamic Characteristics of Synchronous Belt of a Diesel Using Multi-Body Dynamics ». Applied Mechanics and Materials 97-98 (septembre 2011) : 721–25. http://dx.doi.org/10.4028/www.scientific.net/amm.97-98.721.

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The dynamic tension of synchronous belt and pulleys forces are obtained by analyzing the dynamic characteristics of timing drive system of a diesel based on muti-body dynamics. The effects of crankshaft speed fluctuation and other excitations on the dynamics characteristics of synchronous belt are illustrated. After the analysis, it is found that crankshaft speed fluctuation has a great influence on the linear and transversal vibrations of synchronous belt. Comparing the simulation results of the original timing system and the one optimized, it is found that the modal frequency of synchronous belt depends on its span. Therefore it is important to control the span of belt and arrange the tensioner pulley properly for timing system design.

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Shi, Yao Chen, Zhan Guo Li et Xiu Guang Yang. « The Tooth Profile of Car Synchronous Belt Influencing on the Stress Distribution ». Applied Mechanics and Materials 602-605 (août 2014) : 339–41. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.339.

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This paper aim at the ZA type car synchronous belt, using the CATIA software create the synchronous belt and pulleys 3D model, divide synchronous belt mesh with ANSYS software, and import into the multi-body dynamics software RecurDyn and build up the dynamic simulation model of the car synchronous belt transmission through the MFBD (more flexible body dynamics) techniques. Analyzed the transmission performance of the synchronous belt、contact stress of tooth surface and tension stress. It propose the stress distribution between belt and pulley, and the distribution state of the tensile stress. It provide a digital simulation and design method to design the car synchronous belt tooth shape, analysis the transmission performance and select the material of rubber and the reinforcing cords.

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Pavlova, Olga Nikolaevna, Alexyi Aleksandrovich Anisimov, Alexyi Igorevich Nazimov et Alexyi Nikolaevich Pavlov. « Synchronous Dynamics of Nephrons Ensembles ». Izvestiya of Saratov University. New series. Series : Physics 11, n^o 1 (2011) : 3–10. http://dx.doi.org/10.18500/1817-3020-2011-11-1-3-10.

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YANG, XIAO-SONG, et QUAN YUAN. « EMERGENT CHAOS SYNCHRONIZATION IN NONCHAOTIC CNNS ». International Journal of Bifurcation and Chaos 18, n^o 05 (mai 2008) : 1337–42. http://dx.doi.org/10.1142/s0218127408021026.

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It is shown that emergent chaos synchronization can take place in coupled nonchaotic unit dynamical systems. This is demonstrated by coupling two nonchaotic cellular neural networks, in which the couplings give rise to a synchronous chaotic dynamics and in the meanwhile the synchronous dynamics is globally asymptotically stable, thus chaos synchronization takes place under the suitable couplings.

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Hwang, Yunn Lin, et Van Thuan Truong. « A Synchronous Approach for Numerical Simulation of Machine Tools ». Key Engineering Materials 642 (avril 2015) : 317–22. http://dx.doi.org/10.4028/www.scientific.net/kem.642.317.

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In this paper, a synchronous approach for dynamic simulation of machine tools is described. Computer Aided Engineering (CAE) method models and analyzes a dynamical parameter prototype of machine tools. In which, the flexible structure, interactive movement, non-linear factor effects as well as characteristics of resonance frequencies and mechanical transfer function are considered. The integrating Finite Element Method (FEM), Multi-Body Dynamics (MBD) and control carries out a solution of machine tools simulation for predicting dynamic machine behaviors. The static analysis and modal analysis of components are presented with sample examples. Cybernetic characteristics like Bode diagram and such a controller are implemented for movement tailors. The synchronous approach deduces a practically technical method for machines tools.

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Cirillo, Emilio Nicola Maria, Vanessa Jacquier et Cristian Spitoni. « Metastability of Synchronous and Asynchronous Dynamics ». Entropy 24, n^o 4 (24 mars 2022) : 450. http://dx.doi.org/10.3390/e24040450.

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Metastability is a ubiquitous phenomenon in nature, which interests several fields of natural sciences. Since metastability is a genuine non-equilibrium phenomenon, its description in the framework of thermodynamics and statistical mechanics has progressed slowly for a long time. Since the publication of the first seminal paper in which the metastable behavior of the mean field Curie–Weiss model was approached by means of stochastic techniques, this topic has been largely studied by the scientific community. Several papers and books have been published in which many different spin models were studied and different approaches were developed. In this review, we focus on the comparison between the metastable behavior of synchronous and asynchronous dynamics, namely, stochastic processes in discrete time in which, at each time, either all the spins or one single spin is updated. In particular, we discuss how two different stochastic implementations of the very same Hamiltonian give rise to different metastable behaviors.

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Vasseur, David A., Jeremy W. Fox, Andrew Gonzalez, Rita Adrian, Beatrix E. Beisner, Matthew R. Helmus, Catherine Johnson et al. « Synchronous dynamics of zooplankton competitors prevail in temperate lake ecosystems ». Proceedings of the Royal Society B : Biological Sciences 281, n^o 1788 (7 août 2014) : 20140633. http://dx.doi.org/10.1098/rspb.2014.0633.

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Although competing species are expected to exhibit compensatory dynamics (negative temporal covariation), empirical work has demonstrated that competitive communities often exhibit synchronous dynamics (positive temporal covariation). This has led to the suggestion that environmental forcing dominates species dynamics; however, synchronous and compensatory dynamics may appear at different length scales and/or at different times, making it challenging to identify their relative importance. We compiled 58 long-term datasets of zooplankton abundance in north-temperate and sub-tropical lakes and used wavelet analysis to quantify general patterns in the times and scales at which synchronous/compensatory dynamics dominated zooplankton communities in different regions and across the entire dataset. Synchronous dynamics were far more prevalent at all scales and times and were ubiquitous at the annual scale. Although we found compensatory dynamics in approximately 14% of all combinations of time period/scale/lake, there were no consistent scales or time periods during which compensatory dynamics were apparent across different regions. Our results suggest that the processes driving compensatory dynamics may be local in their extent, while those generating synchronous dynamics operate at much larger scales. This highlights an important gap in our understanding of the interaction between environmental and biotic forces that structure communities.

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Friston, Karl J. « The labile brain. I. Neuronal transients and nonlinear coupling ». Philosophical Transactions of the Royal Society of London. Series B : Biological Sciences 355, n^o 1394 (29 février 2000) : 215–36. http://dx.doi.org/10.1098/rstb.2000.0560.

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In this, the first of three papers, the nature of, and motivation for, neuronal transients is described in relation to characterizing brain dynamics. This paper deals with some basic aspects of neuronal dynamics, interactions, coupling and implicit neuronal codes. The second paper develops neuronal transients and nonlinear coupling in the context of dynamic instability and complexity, and suggests that instability or lability is necessary for adaptive self–organization. The final paper addresses the role of neuronal transients through information theory and the emergence of spatio–temporal receptive fields and functional specialization. By considering the brain as an ensemble of connected dynamic systems one can show that a sufficient description of neuronal dynamics comprises neuronal activity at a particular time and its recent history. This history constitutes a neuronal transient. As such, transients represent a fundamental metric of neuronal interactions and, implicitly, a code employed in the functional integration of brain systems. The nature of transients, expressed conjointly in distinct neuronal populations, reflects the underlying coupling among populations. This coupling may be synchronous (and possibly oscillatory) or asynchronous. A critical distinction between synchronous and asynchronous coupling is that the former is essentially linear and the latter is nonlinear. The nonlinear nature of asynchronous coupling enables the rich, context–sensitive interactions that characterize real brain dynamics, suggesting that it plays a role in functional integration that may be as important as synchronous interactions. The distinction between linear and nonlinear coupling has fundamental implications for the analysis and characterization of neuronal interactions, most of which are predicated on linear (synchronous) coupling (e.g. crosscorrelograms and coherence). Using neuromagnetic data it is shown that nonlinear (asynchronous) coupling is, in fact, more abundant and can be more significant than synchronous coupling.

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Bolotov, Maxim, Tatiana Levanova, Lev Smirnov et Arkady Pikovsky. « Dynamics of disordered heterogeneous chains of phase oscillators ». Cybernetics and Physics, Volume 8, 2019, Number 4 (30 décembre 2019) : 215–21. http://dx.doi.org/10.35470/2226-4116-2019-8-4-215-221.

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We study the problem of robustness of synchronous states to disorder in the chain of phase oscillators with local coupling. The study combines a numerical determination of the existence and stability of synchronous states with an analytical investigation of the role of the phase shift and the level of disorder in the natural frequencies in the destruction of synchrony. We show that the presence of the phase shift facilitates robustness of the synchronous regime, at least up to its certain threshold value.

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Wallach, Avner, et Shimon Marom. « Interactions between network synchrony and the dynamics of neuronal threshold ». Journal of Neurophysiology 107, n^o 11 (1 juin 2012) : 2926–36. http://dx.doi.org/10.1152/jn.00876.2011.

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Synchronous activity impacts on a range of functional brain capacities in health and disease. To address the interrelations between cellular level activity and network-wide synchronous events, we implemented in vitro a recently introduced technique, the response clamp, which enables online monitoring of single neuron threshold dynamics while ongoing network synchronous activity continues uninterrupted. We show that the occurrence of a synchronous network event causes a significant biphasic change in the single neuron threshold. These threshold dynamics are correlated across the neurons constituting the network and are entailed by the input to the neurons rather than by their own spiking (i.e., output) activity. The magnitude of network activity during a synchronous event is correlated with the threshold state of individual neurons at the event's onset. Recovery from the impact of a given synchronous event on the neuronal threshold lasts several seconds and seems to be a key determinant of the time to the next spontaneously occurring synchronous event. Moreover, the neuronal threshold is shown to be correlated with the excitability dynamics of the entire network. We conclude that the relations between the two levels (network activity and the single neuron threshold) should be thought of in terms that emphasize their interactive nature.

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Thèses sur le sujet "Synchronous dynamics"

Connor, Peter. « Computational fluid dynamics modelling of a synchronous electric generator ». Thesis, University of Nottingham, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.755815.

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An air-cooled synchronous generator has been studied for its airflow and thermal analysis using Computational Fluid Dynamics (CFD) in conjunction with experimental validation. Due to the temperature dependent resistive losses in the machine’s windings, any improvement in cooling provides a direct reduction in losses and an increase in efficiency. In addition, detailed modelling of machine windage components provide an insight for efficiency savings associated with airflow. A full 3600 CFD generator model has been constructed including all major solid components in conjunction with the air fluid regions. Fluid flow, turbulence, rotation as well as conjugate heat transfer modelling was solved throughout the whole machine. The CFD model has been validated using experimental testing on a newly commissioned rig. Airflow parameters of mass flow rate, torque and local pressures were used to validate the fluid modelling. Thermal measurements of stator temperature, heat flux and calculated heat transfer coefficients were used to validate the conjugate heat transfer modelling of the machine. Temperature distributions throughout all machine components were analysed. These have been explained by detailed analysis of local surface heat transfer coefficients and the associated local air flow structures which determine them. This versatility and detail in the thermal analysis of electrical machines is unique to CFD modelling. The methodology presented in this thesis demonstrates advancement in the scale and complexity for CFD analyses of electrical machines. This level of cooling scrutiny will enable informed design developments for step changes in machine efficiency.

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Danielsson, Christer. « Analysis of Synchronous machine dynamics using a novel equivalent circuit model ». Licentiate thesis, Stockholm : Skolan för elektro- och systemteknik, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10510.

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Watson, Eric. « Sun-Synchronous Orbit Slot Architecture Analysis and Development ». DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/760.

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Space debris growth and an influx in space traffic will create a need for increased space traffic management. Due to orbital population density and likely future growth, the implementation of a slot architecture to Sun-synchronous orbit is considered in order to mitigate conjunctions among active satellites. This paper furthers work done in Sun-synchronous orbit slot architecture design and focuses on two main aspects. First, an in-depth relative motion analysis of satellites with respect to their assigned slots is presented. Then, a method for developing a slot architecture from a specific set of user defined inputs is derived.

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Diesmann, Markus. « Conditions for stable propagation of synchronous spiking in cortical neural networks single neuron dynamics and network properties / ». [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=968772781.

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HAUS, EMANUELE. « DYNAMICS OF AN ELASTIC SATELLITE WITH INTERNAL FRICTION. ASYMPTOTIC STABILITY VS COLLISION OR EXPULSION ». Doctoral thesis, Università degli Studi di Milano, 2012. http://hdl.handle.net/2434/172628.

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In this thesis, we study the dynamics of an elastic body, whose shape and position evolve due to the gravitational forces exerted by a pointlike planet whose position is fixed in space. The first result of this thesis is that, if any internal deformation of the body dissipates some energy, then the dynamics of the system has only three possible final behaviors: (i) the satellite is expelled to infinity, (ii) the satellite falls on the planet, (iii) the satellite is captured in a synchronous orbit. By item (iii) we mean that the shape of the body reaches a final configuration, that a principal axis of inertia is directed towards the attracting planet and that the center of mass of the satellite moves on a circle of constant radius. Secondly, we study the stability of the synchronous orbit. Restricting to the quadrupole approximation and assuming that the body is very rigid, we prove that such an orbit is (locally) asymtotically stable, both in the case of a triaxial satellite and in the case of a satellite with spherical symmetry. Some additional results on the dynamics of the body close to the synchronous orbit and some new kinematical results are also present in the thesis.

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Le, Luong Huong Thao. « Optimal Design of Modular High Performance Brushless Wound Rotor Synchronous Machine for embedded systems ». Thesis, Toulouse, INPT, 2018. http://www.theses.fr/2018INPT0111/document.

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Cette thèse est dédiée à la conception optimale de la machine synchrone à rotor bobiné modulaire sans balais pour les systèmes embarqués. Cette machine est basée sur une structure POKIPOKITM développée par Mitsubishi Electric Coopération avec les convertisseurs de puissance intégrée pour augmenter la capacité de tolérance aux défauts. L'analyse électromagnétique est utilisée pour étudier les différentes machines synchrones à rotor bobiné et donc, pour sélectionner la structure qui offre la meilleure tolérance aux défauts et les performances les plus élevées. D’abord, le choix des nombres de phases, d’encoches et de pôles est un point critique. Ensuite, quelques machines sont analysées et comparées selon les critères tels que la densité de couple, le rendement, l'ondulation de couple. La machine avec 7 phases, 7 encoches et 6 pôles est alors choisie. Cette machine est ensuite comparée à la machine synchrone à aimant permanent monté en surface. Le résultat démontre que la machine synchrone à rotor bobiné modulaire sans balais possède le potentiel de remplacer la machine synchrone à aimant permanent dans notre application parce qu’elle présente des performances similaires avec une capacité de tolérance aux défauts élevée. Dans un second temps, une fois la structure 7phases/7encoches/6pôles choisie, cette machine est optimisée en utilisant NOMAD (qui est un logiciel d'optimisation de boîte noire) afin de minimiser le volume externe sous les contraintes électromagnétiques, thermiques et mécaniques. Comme ce problème d'optimisation est extrêmement difficile à résoudre, quelques relaxations ont été effectuées pour tester les différents algorithmes d'optimisation : fmincon (de Matlab) et NOMAD. Nous remarquons que NOMAD est plus efficace que fmincon pour trouver des solutions à ce problème de conception où certaines contraintes sont calculées par des simulations numériques (ANSYS Maxwell ; code éléments finis). En utilisant la méthode NOMAD basée sur l’algorithme Mesh Adaptive Direct Search, nous obtenons des résultats optimaux qui satisfont toutes les contraintes proposées. Il est nécessaire de valider ce design optimisé en vérifiant toutes les contraintes par des simulations électromagnétiques et thermiques en 3D. Les résultats montrent que le couple moyen obtenu par la simulation en 3D est inférieur à la valeur souhaitée. Par conséquent, en augmentant la longueur de la machine, une nouvelle machine corrigée est ainsi obtenue. Nous observons que les pertes de fer obtenues en 3D sont plus élevées qu'en 2D en raison du flux de fuite dans la tête de bobinage. En prenant les valeurs des pertes analysées par la simulation en 3D, la température de surface de la nouvelle machine analysée par la méthode Computational Fluid Dynamics est plus élevée que celle calculée dans l’optimisation. Enfin, un prototype de machine est construit et quelques tests expérimentaux est réalisés. Le résultat montre que la force électromotrice à vide a une forme d'onde similaire par rapport à la prédiction numérique en 3D et la différence de couple statique maximum entre les tests expérimentaux et les simulations par éléments finis en 3D est faible
This thesis is dedicated to the design and the optimization of modular brushless wound rotor synchronous machine for embedded systems. This machine is constructed based on POKIPOKITM structure with integrated drive electronics. Finite element analysis based optimization becomes more popular in the field of electrical machine design because analytical equations are not easily formalized for the machines which have complicate structures. Using electromagnetic analysis to comparatively study different modular brushless wound rotor synchronous machines and therefore, to select the structure which offers the best fault tolerant capability and the highest output performances. Firstly, the fundamental winding factor calculated by using the method based on voltage phasors is considered as a significant criterion in order to select the numbers of phases, stator slots and poles. After that, 2D finite element numerical simulations are carried out for a set of 15 machines to analyze their performances. The simulation results are then compared to find an appropriate machine according to torque density, torque ripple and machine efficiency. The 7phase/7-slot/6-pole machine is chosen and compared with a reference design surfacemounted permanent magnet synchronous machine in order to evaluate the interesting performance features of the wound rotor synchronous machine. In the second design stage, this machine is optimized by using derivative-free optimization. The objective is to minimize external volume under electromagnetic, thermal and mechanical constraints. Given that an accurate finite element analysis for machine performance takes a long time. Moreover, considering that the average torque can be obtained by simulating the model with only four rotor positions instead of one electric period, optimization strategy is proposed to reduce computational time and therefore, obtain a fast convergence ability by defining relaxed problems which enable minimizing the external volume of the machine under only several constraints such as average torque, torque ripple and copper losses. By testing relaxed problems, two different optimization methods (NOMAD and fmincon) are compared in order to select an appropriate method for our optimization problem. Using NOMAD method based on Mesh Adaptive Direct Search, we achieve optimal results which satisfy all of the constraints proposed. In the third design stage, all constraints are validated by 3D electromagnetic and thermal simulations using finite element and computational fluid dynamics methods. The 3D results show that the average torque obtained is lower than the desired value. By increasing the length of the machine, a new corrected machine is thus obtained. It can be observed that the iron losses obtained in 3D are higher than that in 2D due to the leakage flux in the end-winding. Then, the machine temperature is analyzed by using ANSYS Fluent. Note that the surface temperature is higher than that calculated in the optimization and the coil temperature is 8.48°C higher than the desired value (105°C). However, some dissipation by the shaft and the bearings of the machine are expected to reduce the machine temperature. Finally, a machine prototype is built and some experimental tests are carried out. The results show that the electromotive force has a similar waveform compared to 3D prediction and the difference of the measured and predicted maximum static torques is small

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Roman, Jan. « Řízení lineární pohonů HIWIN ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231280.

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The diploma thesis deals with three phase linear synchronous electric motors mounted on linear drive, its system of sensors and control. The analysis of working principle and classification of linear motor was done in the beginning part; analysis of the drives sensors system was made in the following chapter. The thesis also deals with the driver from the automation point of view, its tuning and behavior according to high dynamics and precise positioning. The last chapter discusses the issue of controlling two linear drives. Whole thesis was realized on a borrowed linear motor with driver from HIWIN corp.

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Veprauskas, Amy, et J. M. Cushing. « A juvenile–adult population model : climate change, cannibalism, reproductive synchrony, and strong Allee effects ». TAYLOR & ; FRANCIS LTD, 2016. http://hdl.handle.net/10150/623279.

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We study a discrete time, structured population dynamic model that is motivated by recent field observations concerning certain life history strategies of colonial- nesting gulls, specifically the glaucouswinged gull ( Larus glaucescens). The model focuses on mechanisms hypothesized to play key roles in a population's response to degraded environment resources, namely, increased cannibalism and adjustments in reproductive timing. We explore the dynamic consequences of these mechanics using a juvenile- adult structure model. Mathematically, the model is unusual in that it involves a high co- dimension bifurcation at R0 = 1 which, in turn, leads to a dynamic dichotomy between equilibrium states and synchronized oscillatory states. We give diagnostic criteria that determine which dynamic is stable. We also explore strong Allee effects caused by positive feedback mechanisms in the model and the possible consequence that a cannibalistic population can survive when a non- cannibalistic population cannot.

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Carvalho, Marcelo Moreira de. « Análise da influência de diferentes tipos de cargas no desempenho da proteção anti-ilhamento de geradores distribuídos ». Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-10102014-103332/.

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A conexão de geradores distribuídos nas redes de subtransmissão e de distribuição de energia elétrica se mostra cada vez mais crescente devido aos inúmeros benefícios técnicos e econômicos alcançados com essa tecnologia. No entanto, há importantes implicações técnicas que precisam ser analisadas antes que um gerador distribuído seja conectado em paralelo ao sistema elétrico. Um aspecto a ser analisado, e que é comum entre as concessionárias de energia elétrica é a adequação da proteção anti-ilhamento, a qual tem a função de detectar essa condição e, automaticamente, desconectar os geradores distribuídos, dentro de um tempo pré-determinado, e assim mantê-los até que o fornecimento de energia seja restabelecido. Neste contexto, este trabalho analisará o desempenho dos relés de proteção anti-ilhamento em face de diferentes tipos de cargas que acabam afetando o tempo de detecção do ilhamento. Com isso, pretende-se obter subsídios para que os ajustes desses relés sejam calculados de forma eficiente. Os relés estudados são o relé de sub/sobrefrequência e o relé de taxa de variação da frequência, e o gerador distribuído é do tipo síncrono equipado com controle de tensão. As análises mostraram que no instante em que ocorre um ilhamento os fatores que mais influenciam no desempenho dos relés de proteção anti-ilhamento são as condições de carga e geração, tempo de detecção estabelecido, tipo do relé adotado, ajuste do mesmo e modelo de carga utilizado.
The connection of distributed generators to power subtransmission and distribution networks has been increasing recently due to the technical and economic benefits that such technology can provide. However, there are important technical issues that need to be carefully analyzed before a distributed generator is connected to electrical systems. One issue to be analyzed, which is common sense among utility companies, is the anti-islanding protection, whose main goal is to detect unintentional islanding and, automatically, disconnect the distributed generators within a required time-interval. In this context, this work will analyze the performance of anti-islanding protection relays in face of different load types. With this study, one intend to get support for adjusting these relays efficiently. The relays studied in this work are the under/over frequency and the rate of change of frequency relays, and the distributed generator is a synchronous machine equipped with an automatic voltage regulator. The analyzes showed that the moment a islanding occurs the most important factors influencing the performance of relays anti-islanding protection are the conditions of load and generation, detection time set, type and relay setting adopted and load model.

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Poole, M. J. « Synchronous concurrent algorithms and dynamical systems ». Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638547.

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A synchronous concurrent algorithm (SCA) is an algorithm that is described as a network of interconnected processors or modules, whose computation and communication are synchronised by a global clock. The concept of an SCA was originally introduced to model parallel deterministic computer systems, and as a neutral basis for formally reasoning about their structure, operation and correctness. The mathematical theory of SCAs is based on the theory of primitive recursive functions over many-sorted stream algebras. Examples of SCAs studied thus far include conventional digital hardware, systolic arrays and signal processing algorithms. In addition, many models of physical and biological systems have been identified as SCAs. These include cellular automata (CAs), coupled map lattices (CMLs), neural networks (NNs), and numerical approximations to partial differential equations (PDEs) and coupled ordinary differential equations (CODEs). The study of these spatially-extensive dynamical systems may be unified and enriched by the application of a wide range of mathematical tools from the theory of SCAs in particular, and from theoretical computer science in general. The first aim of this thesis is to integrate fully two of these classes, CAs and CMLs, into the formal computational framework of SCAs. We demonstrate the application of SCA theory of these dynamical systems, and present detailed SCA case studies of CA and CML models of wave propagation in excitable media and electrical signals in heart muscle. Our other primary objective is to provide practical software tools for the computer simulation, analysis and automatic testing of SCAs. We define formally a collection of new SCA programming languages, known as Caress II, in which parallelism is represented by the multiple or concurrent assignment. Caress II is designed to facilitate the representation of networks, tasks specifications and automatic testing procedures that are defined over arbitrary stream algebras.

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Livres sur le sujet "Synchronous dynamics"

1931-, Pai M. A., dir. Power system dynamics and stability. Upper Saddle River, N.J : Prentice Hall, 1998.

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Atarod, Vida. Impact of synchronous machine constants and models on the analysis of torsional dynamics. Ottawa : National Library of Canada, 1992.

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T, Flowers George, et United States. National Aeronautics and Space Administration., dir. Synchronous dynamics of a coupled shaft-bearing-housing system with auxiliary support for a clearance bearing : Analysis and experiment. [Washington, DC : National Aeronautics and Space Administration, 1992.

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Aḥmad, Sayyid Muk̲h̲tār. High performance AC drives : Modelling analysis and control. London : Springer Verlag, 2010.

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Ao, Hai. A circuit network approach for dynamic modelling of synchronous machines. Ottawa : National Library of Canada, 1996.

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IEEE Power Engineering Society. Power Generation Committee. Excitation Systems Subcommittee. et IEEE Standards Board, dir. IEEE guide for identification, testing, and evaluation of the dynamic performance of excitation control systems. New York, N.Y : The Institute of Electrical and Electronics Engineers, 1990.

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Abu-Saba, Elias G. Dynamics and control of the orbiting grid structures and the synchronously deployable beam : Semi-annual report. [Washington, D.C : National Aeronautics and Space Administration, 1985.

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Chow, Joe H., Peter W. Sauer et M. A. Pai. Power System Dynamics and Stability : With Synchrophasor Measurement and Power System Toolbox. Wiley-Interscience, 2017.

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Chow, Joe H., Peter W. Sauer et M. A. Pai. Power System Dynamics and Stability : With Synchrophasor Measurement and Power System Toolbox. Wiley & Sons, Incorporated, John, 2017.

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Chow, Joe H., Peter W. Sauer et M. A. Pai. Power System Dynamics and Stability : With Synchrophasor Measurement and Power System Toolbox. Wiley & Sons, Incorporated, John, 2017.

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Chapitres de livres sur le sujet "Synchronous dynamics"

Eremia, Mircea, et Constantin Bulac. « Synchronous Generator and Induction Motor ». Dans Handbook of Electrical Power System Dynamics, 9–135. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118516072.ch2.

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Henrard, Jacques. « The Synchronous Rotation of the Moon ». Dans Dynamics of Extended Celestial Bodies and Rings, 159–67. Berlin, Heidelberg : Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/3-540-32455-0_7.

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Abaid, Nicole, et Maurizio Porfiri. « Synchronous Dynamics over Numerosity-Constrained Stochastic Networks ». Dans Understanding Complex Systems, 95–121. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29329-0_5.

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Lu, Qiang, Yuanzhang Sun et Shengwei Mei. « Nonlinear Excitation Control of Large Synchronous Generators ». Dans Nonlinear Control Systems and Power System Dynamics, 199–244. Boston, MA : Springer US, 2001. http://dx.doi.org/10.1007/978-1-4757-3312-9_6.

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Iwatsubo, Takuzo, Yoshito Yamamoto et Ryoji Kawai. « Startup Torsional Vibration of Rotating Machine Driven by Synchronous Motor ». Dans Dynamics of Multibody Systems, 91–102. Berlin, Heidelberg : Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82755-6_8.

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Ribeiro, Tony, Maxime Folschette, Morgan Magnin, Olivier Roux et Katsumi Inoue. « Learning Dynamics with Synchronous, Asynchronous and General Semantics ». Dans Inductive Logic Programming, 118–40. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99960-9_8.

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Camerini, V., G. Coppotelli et S. Bendisch. « Experimental Evaluation and Statistical Analysis of Synchronous Averaging ». Dans Special Topics in Structural Dynamics, Volume 6, 67–84. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-53841-9_6.

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Murthy, Venkatesh N., Fumi Aoki et Eberhard E. Fetz. « Synchronous Oscillations in Sensorimotor Cortex of Awake Monkeys and Humans ». Dans Oscillatory Event-Related Brain Dynamics, 343–56. Boston, MA : Springer US, 1994. http://dx.doi.org/10.1007/978-1-4899-1307-4_24.

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Rao, J. S., Vijendra Gupta, Prachi Khullar et D. Srinivas. « Prediction of Rotor Dynamic Behavior of Synchronous Generators ». Dans Proceedings of the 9th IFToMM International Conference on Rotor Dynamics, 1797–808. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06590-8_148.

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Kratz, Timothy K., Patricia A. Soranno, Stephen B. Baines, Barbara J. Benson, John J. Magnuson, Thomas M. Frost et Richard C. Lathrop. « Interannual Synchronous Dynamics in North Temperate Lakes in Wisconsin, USA ». Dans Management of Lakes and Reservoirs during Global Climate Change, 273–87. Dordrecht : Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4966-2_19.

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Actes de conférences sur le sujet "Synchronous dynamics"

Tatevosyan, Andrey A. « The calculation of the magnetic field of the synchronous magnetoelectric generator ». Dans 2016 Dynamics of Systems, Mechanisms and Machines (Dynamics). IEEE, 2016. http://dx.doi.org/10.1109/dynamics.2016.7819095.

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Simakov, Alexander V., Oleg A. Lysenko, Lyudmila D. Fedorova, Sergey G. Shantarenko et Victor V. Kharlamov. « The research of magneto-electric synchronous machine for wind energy conversion systems ». Dans 2017 Dynamics of Systems, Mechanisms and Machines (Dynamics). IEEE, 2017. http://dx.doi.org/10.1109/dynamics.2017.8239509.

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Monakhov, Yuri M., Andrey V. Telny, Mikhail Yu Monakhov et A. P. Kuznetsova. « Adaptive Algorithm for Synchronous-Asynchronous Radio Transmission System Operation ». Dans 2020 Dynamics of Systems, Mechanisms and Machines (Dynamics). IEEE, 2020. http://dx.doi.org/10.1109/dynamics50954.2020.9306144.

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Bubnov, A. V., A. N. Chudinov, A. N. Chetverik et V. I. Shpineva. « Development and Investigation of a Computer Model of a Synchronous-in-phase Electric Drive ». Dans 2018 Dynamics of Systems, Mechanisms and Machines (Dynamics). IEEE, 2018. http://dx.doi.org/10.1109/dynamics.2018.8601446.

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Bubnov, Alexey V., Marina V. Gokova et Alina N. Alpysova. « Improvement of phasing method of synchronous-infase electric drive with quasi optimal for fast release regulation ». Dans 2014 Dynamics of Systems, Mechanisms and Machines (Dynamics). IEEE, 2014. http://dx.doi.org/10.1109/dynamics.2014.7005642.

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Sattarov, Robert R., et Timur Ziganshin. « Axial-Flux Permanent Magnet Synchronous Generator for Float Buoy Type Wave Energy Converters ». Dans 2019 Dynamics of Systems, Mechanisms and Machines (Dynamics). IEEE, 2019. http://dx.doi.org/10.1109/dynamics47113.2019.8944704.

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Marin, Manuel A. « Rotor Dynamics of Overhung Rotors : Hysteretic Dynamic Behavior ». Dans ASME Turbo Expo 2012 : Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68285.

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Overhung-configuration rotors are commonly used in the oil, gas and process industries. Examples of this type of equipment include power turbines, Fluid Catalytic Cracking (FCC) expanders, turbochargers and pipeline boosters. Generally, in overhung-configuration rotors, the mass concentration is near the bearing on the overhung end, so the rotor dynamics behavior of these overhung-configuration rotors is different than other equipments that have their mass concentrations between the bearing spans, such as multistage compressors. Among the more important characteristics that directly affect the rotor dynamics of the overhung rotors are gyroscopic effects on the higher modes and the fluid-film journal bearings. Gyroscopic effects are more significant in overhung configurations because of the relatively large overhung mass. These rotors also have a short bearing span and a relatively stiff shaft, so the first two modes are characterized by rigid body motion, as long as the bearing supports are rigid, as in most pipeline boosters. For pipeline boosters it would be typical to describe them as subcritical machines. If the bearing supports are not rigid, as at the disc end of power turbines and FCC expanders, then the first mode can be amplified, and it would not be unusual to describe them as supercritical machines. This paper will assume that the bearing supports are rigid, as in most pipeline boosters. A phenomenon observed in overhung rotors is known as the synchronous thermal instability or “Morton Effect”. The Morton Effect occurs when synchronous vibration produces non-uniform heating of the shaft under the bearing, leading the shaft end to develop a thermal bow. It is typical for this to happen on the overhung end of the rotor, where there is more unbalance to react with any thermal bow. The paper examines the hysteretic dynamic behavior observed in an overhung rotor mounted on tilting pad journal bearings, presenting a series of analysis using state-of-the-art rotor dynamics programs, and comparing analytical results with measurements, handling possible variables associated with synchronous “hysteresis” vibration.

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Zakir Hossain, M., et Wolfgang Grill. « Synchronous monitoring of muscle dynamics and electromyogram ». Dans SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, sous la direction de Tribikram Kundu. SPIE, 2011. http://dx.doi.org/10.1117/12.880154.

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Tang, Kun, Yiyi Zhao, Jiangbo Zhang et Jiangping Hu. « Synchronous CODA opinion dynamics over social networks ». Dans 2021 40th Chinese Control Conference (CCC). IEEE, 2021. http://dx.doi.org/10.23919/ccc52363.2021.9550301.

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Tatevosyan, A. A., et N. V. Zaharova. « Preliminary Thermal Solution of The Magnetic System of a Synchronous Generator With the Common Cylindrical Magnetic Core ». Dans 2021 Dynamics of Systems, Mechanisms and Machines (Dynamics). IEEE, 2021. http://dx.doi.org/10.1109/dynamics52735.2021.9653459.

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Rapports d'organisations sur le sujet "Synchronous dynamics"

Kats, J. M. Synchronous particle and bucket dynamics. Office of Scientific and Technical Information (OSTI), octobre 1988. http://dx.doi.org/10.2172/6615064.

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Paternesi Meloni, Walter, Davide Romaniello et Antonella Stirati. On the Non-Inflationary effects of Long-Term Unemployment Reductions. Institute for New Economic Thinking Working Paper Series, avril 2021. http://dx.doi.org/10.36687/inetwp156.

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The paper critically examines the New Keynesian explanation of hysteresis based on the role of long-term unemployment. We first examine its analytical foundations, according to which rehiring long-term unemployed individuals would not be possible without accelerating inflation. Then we empirically assess its validity along two lines of inquiry. First, we investigate the reversibility of long-term unemployment. Then we focus on episodes of sustained long-term unemployment reductions to check for inflationary effects. Specifically, in a panel of 25 OECD countries (from 1983 to 2016), we verify by means of local projections whether they are associated with inflationary pressures in a subsequent five-year window. Two main results emerge: i) the evolution of the long-term unemployment rate is almost completely synchronous with the dynamics of the total unemployment rate, both during downswings and upswings; ii) we do not find indications of accelerating or persistently higher inflation during and after episodes of strong declines in the long-term unemployment rate, even when they occur in country-years in which the actual unemployment rate was estimated to be below a conventionally estimated Non-Accelerating Inflation Rate of Unemployment (NAIRU). Our results call into question the role of long-term unemployment in causing hysteresis and provide support to policy implications that are at variance with the conventional wisdom that regards the NAIRU as an inflationary barrier.

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Drive modelling and performance estimation of IPM motor using SVPWM and Six-step Control Strategy. SAE International, avril 2021. http://dx.doi.org/10.4271/2021-01-0775.

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This paper presents a comprehensive evaluation of the performance of an interior permanent magnet (IPM) traction motor drive, and analyses the impact of different modulation techniques. The most widely used modulation methods in traction motor drives are Space vector modulation (SVPWM), over-modulation, and six-step modulation have been implemented. A two-dimensional electromagnetic finite element model of the motor is co-simulated with a dynamic model of a field-oriented control (FOC) circuit. For accurate tuning of the current controllers, extended complex vector synchronous frame current regulators are employed. The DC-link voltage utilization, harmonics in the output waveforms, torque ripple, iron losses, and AC copper losses are calculated and compared with sinusoidal excitation. Overall, it is concluded that the selection of modulation technique is related to the operating condition and motor speed, and a smooth transition between different modulation techniques is essential to achieve a better performance.

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