Bibliografías temáticas / Synchronous dynamic

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Literatura académica sobre el tema "Synchronous dynamic"

Autor: Grafiati
Publicado: 9 de noviembre de 2024

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Artículos de revistas sobre el tema "Synchronous dynamic"

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Natanzon, Assaf y Eitan Bachmat. "Dynamic Synchronous/Asynchronous Replication". ACM Transactions on Storage 9, n.º 3 (1 de agosto de 2013): 1–19. http://dx.doi.org/10.1145/2501620.2508011.

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Natanzon, Assaf y Eitan Bachmat. "Dynamic Synchronous/Asynchronous Replication". ACM Transactions on Storage 9, n.º 3 (agosto de 2013): 1–19. http://dx.doi.org/10.1145/2508011.

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Li, Yi Min, Zhi Yong Hao y Jin Li. "Analysis and Research of Dynamic Characteristics of Synchronous Belt of a Diesel Using Multi-Body Dynamics". Applied Mechanics and Materials 97-98 (septiembre de 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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Chen, Qi y Jinlei Li. "Field Dynamic Balancing for Magnetically Suspended Turbomolecular Pump". Sensors 23, n.º 13 (5 de julio de 2023): 6168. http://dx.doi.org/10.3390/s23136168.

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A field dynamic balancer is crucial to the applications of magnetically suspended turbomolecular pumps. Therefore, this paper presents a novel field dynamic balancing method based on autocentering control mode without any additional instrumentation. Firstly, the dynamics of the active magnetic bearing rotor system with unbalance are modeled. Through model analysis, it was found that making the rotor rotate around the geometric axis can improve the accuracy of dynamic balancing. Secondly, the relationship between the correcting masses and the synchronous currents based on the influence coefficient method is established. Then, an autocentering controller is designed to make the rotor rotate around the geometric axis. The synchronous currents can be detected and extracted by the current transducers to calculate the unbalance correction mass. Finally, the experimental results show that this novel field dynamic balancing method can effectively eliminate the majority of rotor unbalance. Compared with the original unbalance of a rotor, the synchronous current in the A-end has been reduced by 71.4% and the synchronous current in the B-end, by 90.8% with the proposed method.
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Boldi, Paolo y Sebastiano Vigna. "Universal dynamic synchronous self-stabilization". Distributed Computing 15, n.º 3 (1 de julio de 2002): 137–53. http://dx.doi.org/10.1007/s004460100062.

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Johannesson, Tomas y Martin Distner. "Dynamic Loading of Synchronous Belts". Journal of Mechanical Design 124, n.º 1 (1 de mayo de 2000): 79–85. http://dx.doi.org/10.1115/1.1426088.

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In automotive timing belt drives friction history effects must be taken into concern due to rapidly changing loads. Here a spring based model capable of handling dynamic load conditions is presented. The model also covers partial meshing effects and utilizes Coulomb friction. The model shows good agreement with experimental data found in literature. It is proven that when simulating synchronous belt drives during rapidly changing load conditions, using models for quasi-static load conditions stepwise are not sufficient.
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Matrosov, Valerij y Dmitry Kasatkin. "Particularities of dynamics of three cascade-coupled phase-locked loops". Izvestiya VUZ. Applied Nonlinear Dynamics 12, n.º 1-2 (20 de junio de 2004): 159–68. http://dx.doi.org/10.18500/0869-6632-2004-12-1-159-168.

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Results of investigations of dynamic modes of three phase-locked loops are presented. The influence of coupling parameters and initial frequency mismatch on synchronous and quasi-synchronous modes is studied. Domains of quasi-synchronous oscillations of controlled oscillators are allocated in the parameter space. The comparative analysis of dynamics of ensembles, consisting of two and three oscillators is carried out.
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Shi, Yao Chen, Zhan Guo Li y Xiu Guang Yang. "The Tooth Profile of Car Synchronous Belt Influencing on the Stress Distribution". Applied Mechanics and Materials 602-605 (agosto de 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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Ramachandra, Shruthi, Mala R.C. y H. V. Gururaja Rao. "Dynamic bifurcation analysis and mitigation of SSR in SMIB system". Indonesian Journal of Electrical Engineering and Computer Science 15, n.º 3 (1 de septiembre de 2019): 1128. http://dx.doi.org/10.11591/ijeecs.v15.i3.pp1128-1137.

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This paper presents a detailed study on Sub-synchronous resonance in a Single machine connected to an infinite bus system by employing Bifurcation Theory. The synchronous machine model considered is a two-axis model, the turbine system is a six mass system. A comparative study of Sub-synchronous resonance for the two-axis synchronous machine models 1.1, 2.1 and 2.2 under constant excitation is presented in this paper. The effect of adding an exciter, power system stabilizer and Static Synchronous Series Compensator to the SMIB system, incorporated with a 2.2 synchronous machine model on the bifurcations of SSR is also investigated. The results obtained on replacing the fixed series compensation of the line by Static Synchronous Series Compensator resulted in the mitigation of Sub-synchronous Resonance. The results obtained for all the above-considered cases are compared with eigenvalue analysis and validated using transient analysis<strong>.</strong>
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Kim, Young Hwan y Yunseok Rhee. "Distributed and Parallel Deep Learning Architecture Exploiting Dynamic Stale Synchronous Parallel Method". Journal of Digital Contents Society 20, n.º 2 (28 de febrero de 2019): 387–94. http://dx.doi.org/10.9728/dcs.2019.20.2.387.

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Tesis sobre el tema "Synchronous dynamic"

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LEITE, ARMANDO GONCALVES. "STATIC AND DYNAMIC SIMULATION OF VOLTAGE CONTROL BY GENERATOR AND SYNCHRONOUS COMPENSATOR". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2008. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=12362@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
O tema abordado neste trabalho é a observação e análise, em regime permanente e dinâmico, da ocorrência de um fenômeno que já foi observado em condições reais de operação do sistema elétrico brasileiro, que é a relação oposta entre a tensão de excitação de geradores e compensadores síncronos e a tensão controlada. Nessas situações, a capacidade nominal de um gerador / compensador síncrono, por exemplo, não seria útil para manter a tensão controlada. Em virtude da relação oposta, um aumento na excitação da máquina abaixaria a tensão controlada. O controle automático continuaria agindo, abaixando ainda mais a tensão. Este mecanismo pode levar o sistema ao colapso. A abordagem do problema baseou-se na verificação do comportamento do gerador / compensador como dispositivo de controle de tensão, em regime permanente e dinâmico, ante as diversas situações normais de um sistema elétrico, tais como variações do valor da tensão de referência (tensão controlada) e de carga. A análise em regime permanente utilizou um algoritmo de fluxo de carga, enquanto a análise em regime dinâmico utilizou a simulação no domínio do tempo. A real existência do fenômeno foi comprovada através de várias destas análises, mostrando inclusive a mudança da região de operação em algumas delas. Em outros casos, os resultados da análise em regime permanente não coincidiram com os da análise em regime dinâmico.
The aim of this work is to investigate, in steady state and dynamic performance, the phenomenon of the opposite relationship, already observed at real operation conditions of the Brazilian Electric System, between generators and synchronous compensators excitation voltage and the controlled one. In these situations, the generator / synchronous compensator nominal capacity, for example, would not be useful to keep the voltage controlled. Due the opposite relationship, an increase in the excitation voltage would reduce the controlled voltage. The automatic control would keep acting and reducing more the voltage. This mechanism can lead the system to the collapse. The study of this problem was based in the generator / compensator behavior as a control voltage device, in steady- state and dynamic performance, front of several operation situations of electric power system, like reference voltage (controlled voltage) variation and load changing. The steady state analysis used a load flow algorithm, while the time domain simulation was utilized for the dynamic performance analysis. The real existence of the phenomenon was verified through these analyses, emphasizing the operation region changing in some of them. In other cases, the analyses results in the steady-state were different of the dynamic performance results.
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Ramachandran, Bhaskar. "Dynamic operation of sensorless dead-time optimization in digitally controlled synchronous buck converters". Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1447688.

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De, Kock Hugo Werner. "Dynamic control of the permanent magnet assisted reluctance synchronous machine with constant current angle". Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/2062.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2006.
This thesis is about the dynamic control of a permanent magnet assisted reluctance synchronous machine (PMA RSM). The PMA RSM in this thesis is a 110 kW traction machine and is ideal for the use in electrical rail vehicles. An application of the dynamic control of the PMA RSM in electrical rail vehicles is to reduce wheel slip. The mathematical model of the PMA RSM is derived and explained in physical terms. Two methods of current control for the PMA RSM are investigated, namely constant field current control (CFCC) and constant current angle control (CCAC). It is shown that CCAC is more appropriate for the PMA RSM. A current controller for the PMA RSM that guarantees stability is derived and given as an analytic formula. This current controller can be used for any method of current control, i.e. CFCC or CCAC. An accurate simulation model for the PMA RSM is obtained using results from finite element analysis (FEA). The accurate model is used in a simulation to verify CCAC. A normal proportional integral speed controller for the PMA RSM is designed and the design is also verified by simulation. Practical implementation of the current and speed controllers is considered along with a general description of the entire drive system. The operation of the resolver (for position measurement) is given in detail. Important safety measures and the design of the electronic circuitry to give protection are shown. Practical results concerning current and speed control are then shown. To improve the dynamic performance of the PMA RSM, a load torque observer with compensation current feedback is investigated. Two observer structures are considered, namely the reduced state observer and the full state observer. The derivation of the full state observer and the detail designs of the observer elements are given. The accurate simulation model of the PMA RSM is used to verify the operation of the observer structures and to evaluate the dynamic performance. Both observer structures are implemented practically and practical results are shown. One method of position sensorless control, namely the high frequency voltage injection method, is discussed in terms of the PMA RSM. This work is additional to the thesis but it is shown, because it raises some interesting questions regarding the dynamic control of the PMA RSM.
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Devarakonda, SaiPrasanth. "Particle Swarm Optimization". University of Dayton / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1335827032.

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Veprauskas, Amy. "On the dynamic dichotomy between positive equilibria and synchronous 2-cycles in matrix population models". Thesis, The University of Arizona, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10124871.

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For matrix population models with nonnegative, irreducible and primitive inherent projection matrices, the stability of the branch of positive equilibria that bifurcates from the extinction equilibrium as the dominant eigenvalue of the inherent projection matrix increases through one is determined by the direction of bifurcation. However, if the inherent projection matrix is imprimitive this bifurcation becomes more complicated. This is the result of the simultaneous departure of multiple eigenvalues from the unit complex circle. Matrix models with imprimitive projection matrices commonly appear in models of semelparous species, which are characterized by one reproductive event that is often followed by death.

Due to the imprimitivity of the projection matrix, semelparous Leslie models exhibit two contrasting dynamics, either equilibria in which all age classes are present or synchronized cycles in which age classes are separated temporally. The two-stage semelparous Leslie model has index of imprimitivity two, meaning that two eigenvalues simultaneously leave the unit circle when the dominant eigenvalue increases past one. This model exhibits a dynamic dichotomy in which the two steady states have opposite stability properties.

We show that this dynamic dichotomy is a general feature of synchrony models which are characterized by the simultaneous creation of a branch of positive equilibria and a branch of synchronous 2-cycles when the extinction equilibrium destabilizes (Chapter 3). A synchrony model must, necessarily, have index of imprimitivity two but is not limited to models of semelparous species. We provide a specific example of a synchrony model for an iteroparous species which is motivated by observations of a cannibalistic gull population (Chapter 2). We also extend the study of the synchrony model to a Darwinian model which couples population dynamics with the dynamics of a suite of evolving phenotypic traits (Chapter 4). For the evolutionary synchrony model, we show that the dynamic dichotomy occurs provided that fitness, as measured by the spectral radius, is maximized. In addition, we examine the dynamic dichotomy for semelparous species in a continuous-time setting (Chapter 5).

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Gao, Feng. "Interior Permanent Magnet Synchronous Motor Demagnetization Fault Modeling and Analysis by Using Dynamic Phasors Model". Thesis, North Dakota State University, 2014. https://hdl.handle.net/10365/27473.

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Interior permanent magnet synchronous motor (IPMSM) has been widely used in hybrid electric vehicles (HEVs) since the high power density and efficiency. However, the primary drawback of IPMSM is the demagnetization phenomenon caused by the permanent magnets. Modeling of the demagnetization fault are important in developing and designing a protection system for the traction on HEVs, thus, an efficient and accurate IPMSM model for demagnetization fault simulation is necessary. By using the conventional dq0 IPMSM model, the current indicators of demagnetization fault are affected by noise which will cause inaccuracy of the simulation. For this reason, a dynamic phasors model of IPMSM is presented in this thesis. In this thesis, firstly, the dynamic phasors model of IPMSM is verified by using small-signal transient analysis for its stability. Secondly, the time-domain transient simulations of positive sequence currents are shown and compared to the conventional dq0 model with demagnetization fault.
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Munukuntla, Sowmya. "Sensitivity Analysis of Synchronous Generators for Real-Time Simulation". ScholarWorks@UNO, 2016. http://scholarworks.uno.edu/td/2172.

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The purpose of this thesis is to validate generator models for dynamic studies of power systems using PSS/E (Power System Simulator for Engineering), EMTP (ElectroMagnetic Transient Program), and Hypersim. To thoroughly evaluate the behavior of a power system in the three specified software packages, it is necessary to have an accurate model for the power system, especially the generator which is of interest. The effect of generator modeling on system response under normal conditions and under faulted conditions is investigated in this work. A methodology based on sensitivity analysis of generator model parameters is proposed aiming to homogenize the behavior of the same power system that is modeled in three software packages. Standard IEEE 14-Bus system is used as a test case for this investigation. Necessary changes in the exciter parameters are made using the proposed methodology so that the system behaves identical across all three software platforms.
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Bahrami, Abdorrahim. "Modelling and Verifying Dynamic Properties of Neuronal Networks in Coq". Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42643.

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Since the mid-1990s, formal verification has become increasingly important because it can provide guarantees that a software system is free of bugs and working correctly based on a provided model. Verification of biological and medical systems is a promising application of formal verification. Human neural networks have recently been emulated and studied as a biological system. Some recent research has been done on modelling some crucial neuronal circuits and using model checking techniques to verify their temporal properties. In large case studies, model checkers often cannot prove the given property at the desired level of generality. In this thesis, we provide a model using the Coq proof assistant and prove some properties concerning the dynamic behavior of some basic neuronal structures. Understanding the behavior of these modules is crucial because they constitute the elementary building blocks of bigger neuronal circuits. By using a proof assistant, we guarantee that the properties are true in the general case, that is, true for any input values, any length of input, and any amount of time. In this thesis, we define a model of human neural networks. We verify some properties of this model starting with properties of neurons. Neurons are the smallest unit in a human neuronal network. In the next step, we prove properties about functional structures of human neural networks which are called archetypes. Archetypes consist of two or more neurons connected in a suitable way. They are known for displaying some particular classes of behaviours, and their compositions govern several important functions such as walking, breathing, etc. The next step is verifying properties about structures that couple different archetypes to perform more complicated actions. We prove a property about one of these kinds of compositions. With such a model, there is the potential to detect inactive regions of the human brain and to treat mental disorders. Furthermore, our approach can be generalized to the verification of other kinds of networks, such as regulatory, metabolic, or environmental networks.
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Herculano-Houzel, Suzana. "Modulation of neuronal synchronous oscillations : dynamic variation with level of cortical activation and long-term use-dependent modification". Paris 6, 1999. http://www.theses.fr/1999PA066610.

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Jayam, Prabhakar Aditya. "Application of STATCOM for improved dynamic performance of wind farms in a power grid". Diss., Rolla, Mo. : Missouri University of Science and Technology, 2008. http://scholarsmine.mst.edu/thesis/pdf/Jayam_Prabhakar_09007dcc804f7428.pdf.

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Thesis (M.S.)--Missouri University of Science and Technology, 2008.
Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed May 12, 2008) Includes bibliographical references (p. 64-66).
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Libros sobre el tema "Synchronous dynamic"

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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. y IEEE Standards Board, eds. 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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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 y United States. National Aeronautics and Space Administration., eds. 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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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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Aḥmad, Sayyid Muk̲h̲tār. High performance AC drives: Modelling analysis and control. London: Springer Verlag, 2010.

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0421.2-90 Dynamic Perfmnce Excitation Control Syst. I.E.E.E.Press, 2004.

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Suwa, Motoo. Synchronous Dynamic Random Access Memory and Memory Controller Device Mounted in Single System in Package: United States Patent 9990981. Independently Published, 2020.

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Nelson, Taylor. MIC23156 - 1. 5A, 3 MHz Synchronous Buck Regulator with HyperLight Load® and I2C Control for Dynamic Voltage Scaling. Microchip Technology Incorporated, 2017.

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Gyugyi, Laszlo. IEEE Std Press Emerging Practices in Technology: Solid State Synchronous Voltage Sources for Dynamic Compensation and Real-Time Control of Ac Transm. Institute of Electrical & Electronics Enginee, 1994.

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Capítulos de libros sobre el tema "Synchronous dynamic"

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Gerling, Dieter. "Dynamic Operation of Synchronous Machines". En Electrical Machines, 369–423. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-17584-8_13.

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Melkebeek, Jan A. "Modelling and Dynamic Behaviour of Synchronous Machines". En Electrical Machines and Drives, 623–60. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72730-1_28.

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Rao, J. S., Vijendra Gupta, Prachi Khullar y D. Srinivas. "Prediction of Rotor Dynamic Behavior of Synchronous Generators". En 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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Luckman, Adrian, Tavi Murray, Remko de Lange y Edward Hanna. "Rapid and Synchronous Ice-Dynamic Changes in East Greenland". En Collected Reprint Series, 1–4. Washington, DC: American Geophysical Union, 2014. http://dx.doi.org/10.1002/9781118782033.ch10.

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Sengupta, Shamik y Mainak Chatterjee. "Synchronous and Asynchronous Auction Models for Dynamic Spectrum Access". En Distributed Computing and Networking, 558–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11947950_61.

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Ostinato, Mattia, Antonio Ortiz-Ambriz y Pietro Tierno. "The Synchronous to Exchange Transition in Magnetically Driven Colloidal Dimers". En Topics in Applied Physics, 69–80. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-58376-6_7.

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AbstractNumerical simulations are used to investigate the collective dynamics of an ensemble of driven paramagnetic colloidal particles confined between two plates. The particles are subjected to an external precessing field and, depending on the field frequency and cell thickness, they can assemble into rotating dimers, up and down binary crystals or dynamic states characterized by particle exchange between nearest dimers. We characterize the transition between the synchronous and the exchange state by measuring the fraction of “active” particles, namely colloids that do not stroboscopically recover their original place in a Voronoi cell. We find that the relaxation time decreases algebraically with the reduced frequency and that the transition displays signatures of an absorbing phase transition.
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Dobrev, Stefan. "Computing Input Multiplicity in Anonymous Synchronous Networks with Dynamic Faults". En Graph-Theoretic Concepts in Computer Science, 137–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/3-540-40064-8_14.

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Birman, Ken, Dahlia Malkhi y Robbert Van Renesse. "Appendix A: Virtually Synchronous Methodology for Building Dynamic Reliable Services". En Guide to Reliable Distributed Systems, 635–71. London: Springer London, 2012. http://dx.doi.org/10.1007/978-1-4471-2416-0_22.

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Michail, Othon, Ioannis Chatzigiannakis y Paul G. Spirakis. "Causality, Influence, and Computation in Possibly Disconnected Synchronous Dynamic Networks". En Lecture Notes in Computer Science, 269–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-35476-2_19.

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Santoro, Nicola y Peter Widmayer. "Majority and Unanimity in Synchronous Networks with Ubiquitous Dynamic Faults". En Structural Information and Communication Complexity, 262–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11429647_21.

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Actas de conferencias sobre el tema "Synchronous dynamic"

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Reinhard, Johannes, Klaus Löhe y Knut Graichen. "Optimal dynamic current control for externally excited synchronous machines". En 2024 IEEE Conference on Control Technology and Applications (CCTA), 146–52. IEEE, 2024. http://dx.doi.org/10.1109/ccta60707.2024.10666513.

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Zhang, Lei, Jianliang Shen, Wenduo Sun y Hongfei Mao. "Dynamic Synchronous Phasor Measurement Algorithm Considering out of Band Interference". En 2024 4th Power System and Green Energy Conference (PSGEC), 1168–72. IEEE, 2024. http://dx.doi.org/10.1109/psgec62376.2024.10721059.

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Rokni, Seyed Ali y Hassan Ghasemzadeh. "Synchronous dynamic view learning". En IPSN '17: The 16th International Conference on Information Processing in Sensor Networks. New York, NY, USA: ACM, 2017. http://dx.doi.org/10.1145/3055031.3055087.

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Boring, Ronald, Thomas Ulrich, Roger Lew y Jooyoung Park. "Synchronous vs. Asynchronous Coupling in the HUNTER Dynamic Human Reliability Analysis Framework". En 14th International Conference on Applied Human Factors and Ergonomics (AHFE 2023). AHFE International, 2023. http://dx.doi.org/10.54941/ahfe1003552.

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The Human Unimodel for Nuclear Technology to Enhance Reliability (HUNTER) framework for dynamic human reliability analysis (HRA) has recently been developed into standalone software. HUNTER creates a virtual operator that is coupled to a virtual system model, in this case a nuclear power plant model. Asynchronous model coupling is most often found in the use of thermohydraulic codes like RELAP5-3D, which are designed to run in batch mode without interruption to determine the evolution of plant parameters from a particular set of conditions. Within RELAP5-3D, it is possible to schedule changes in the configuration, but conditions are determined a priori and not changed once a particular simulation run is started. In contrast, synchronous model coupling is most commonly found in interactive simulators, which feature a system model linked to real-time inputs from a human user. A model that is executed is a simulation, while a simulator is a simulation designed to interact with human inputs. Simulation is typically asynchronous to other models or humans, whereas simulators are synchronous with regular exchanges to other models or humans. For example, a training simulator at a nuclear power plant operates synchronously in such a manner that an input from the reactor operator at any point in time will change the evolution of the simulation run. The simulator provides an evolving response to dynamic contexts that reflect operator actions. The ability to change the simulation direction mid-course is the hallmark of synchronous coupling. HUNTER, as virtual operator, most accurately reflects human-system interactions when it is coupled synchronously with a plant model. In this paper, we explore synchronous and asynchronous coupling based on implementations in HUNTER.
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5

Aouini, Raouia, Khadija Ben Kilani, Bogdan Marinescu y Mohamed Elleuch. "Virtual synchronous generators dynamic performances". En 2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM). IEEE, 2014. http://dx.doi.org/10.1109/cistem.2014.7077025.

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Balini, H. M. N. K., H. Ko¨rog˘lu y Carsten W. Scherer. "LPV Control for Synchronous Disturbance Attenuation in Active Magnetic Bearings". En ASME 2008 Dynamic Systems and Control Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/dscc2008-2250.

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In this research, we consider the problem of suppressing synchronous vibrations in rotors supported by active magnetic bearings. It is observed that the system dynamics are naturally described by an LPV model and the synchronous disturbances are sinusoids with time-varying frequencies. Given this setting, a notion of almost asymptotic regulation is adopted to synthesize LPV controllers. The rotational speed is viewed as the scheduling parameter. The procedure is applied to a model whose parameters are taken from the literature.
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7

Headifen, R. N. "Rotor Dynamic Synchronous Response: A More Thorough Treatment". En ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/93-gt-028.

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Synchronous response can be a very valuable tool for rotor dynamic analysis. It allows the user to determine rotor displacements over a wide speed range without having to perform a transient analysis at every speed increment. The method is typically used to calculate steady state displacements caused by a rotating imbalance force and the location of critical speeds. While the algorithm presented to perform linear synchronous response is straight forward, there are several modifications that can be made to provide the analyst more useful information.
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Marin, Manuel A. "Rotor Dynamics of Overhung Rotors: Hysteretic Dynamic Behavior". En 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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Li Yan y Wang Dongmei. "Simulation of synchronous generator's dynamic operation characteristics". En Instruments (ICEMI). IEEE, 2011. http://dx.doi.org/10.1109/icemi.2011.6037803.

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Krcum, M., A. Gudelj y Z. Juric. "Dynamic simulation of permanent magnet synchronous machine". En Proceedings of the 12th IEEE Mediterranean Electrotechnical Conference (IEEE Cat. No.04CH37521). IEEE, 2004. http://dx.doi.org/10.1109/melcon.2004.1348258.

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Informes sobre el tema "Synchronous dynamic"

1

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

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Paternesi Meloni, Walter, Davide Romaniello y Antonella Stirati. On the Non-Inflationary effects of Long-Term Unemployment Reductions. Institute for New Economic Thinking Working Paper Series, abril de 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, abril de 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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