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检索条件"主题词=computer algorithms"

共 3273 条记录，以下是3181-3190 订阅

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Tracking Control of a Pneumatic Muscle Actuator Using one Servovalve

Tracking Control of a Pneumatic Muscle Actuator Using one Se...

引用

American Control Conference

作者： S. V. Krichel O. Sawodny A. Hildebrandt Institute of System Dynamics University of Stuttgart D-70569 Stuttgart Germany Festo AG & Co. KG Research Mechatronics D-73734 Esslingen Germany

ISBN: (纸本)9781424474264

In this article, a model-based tracking control of a pneumatic muscle actuator using only one 5/3 proportional directional valve is investigated. Pneumatic muscles are difficult to control due to their highly nonlinear system dynamics and hysteresis effects, but they offer advantages such as high power/weight ratio, low costs, easy maintenance and flexibility. The actuator consists of two muscles moving a mass horizontally fixed on a linear guide rail. The challenge is to control those two muscles with only one 5/3 proportional directional control valve. Based on the idea of a cascaded control structure a nonlinear model-based control algorithm is computed. The inner loop control is implemented as a force controller added by a force disturbance observer to estimate unmodeled muscles forces. A position control in the outer loop is added and implemented as a linear tracking controller. The implemented control structure shows good follow-up error and stationary precision in measurements. The shown control approach contributes to an improved path control performance of pneumatic muscle actuators.

关键词： tracking control muscles Pneumatic actuators SERVO VALVE Pneumatic actuators Position control Control Architecture computer algorithms

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Resonant Augmentation Circuits for a Buck Converter Achieving Minimum-Time Voltage Recovery from Load Transients

Resonant Augmentation Circuits for a Buck Converter Achievin...

引用

IEEE Energy Conversion Congress and Exposition

作者： Zhenyu Shan Siew-Chong Tan Chi K. Tse Juri Jatskevich Department of Electrical and Computer Engineering The University of British Columbia Vancouver BC Canada Department of Electrical and Electronic Engineering The University of Hong Kong Pokfulam Hong Kong Department of Electronic and Information Engineering Hong Kong Polytechnic University Kowloon Hong Kong

ISBN: (纸本)9781479957774

This paper presents the use of a resonant circuit for fast voltage recovery of power supplies under large-signal load transients. Previous works have shown that an augmentation circuit (or auxiliary circuit) for voltage recovery may be used to improve the dynamic response, while the main converter is operating for current recovery with load current feedforward control. A compact, low cost and magnetic-coreless topology with a simple control algorithm to achieve an augmentation circuit is presented. In the prototype, the inductors are realized using printed copper wires. The control algorithm is realized by a low cost and low density logic device. Simulation and experimental results validate the feasibility and effectiveness of the circuit.

关键词： voltage recovery computer algorithms step-down converter Resonant circuits auxiliary circuit Electric Power Source Dynamic response

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An Application of IMPACT Structure to Bilateral Teleoperations

An Application of IMPACT Structure to Bilateral Teleoperatio...

引用

2010 49th IEEE Conference on Decision and Control

作者： Alper Denasi Dragan Kostic Henk Nijmeijer Dynamics and Control Group Department of Mechanical Engineering Technische Universiteit Eindhoven 5600 MB Eindhoven The Netherlands

ISBN: (纸本)9781424477456

Time-delays typically cause stability and performance problems in teleoperation systems. As a remedy for such problems in position-error based bilateral teleoperations, a control algorithm is proposed which is derived as a robust modification of a Smith predictor structure for time-delay compensation. The considered modification is based on an application of the Internal Model Principle And Control Together (IMPACT). The resulting algorithm allows rejection of disturbances from a known class, that act at the output of the slave. Linear dynamics are considered for both master and slave manipulators and it is assumed that the time-delay due to communication is constant and known upto a certain degree of accuracy. The algorithm is illustrated in simulations.

关键词： Slaves computer algorithms location error Internal model principle Smith predictors Rejection (Psychology) Communication Research

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Predictive Control of Converter Switches in a Multi-Terminal HVDC system

Predictive Control of Converter Switches in a Multi-Terminal...

引用

Annual Conference of the IEEE Industrial Electronics Society

作者： Mohsen Vatani Morten Hovd Department of Engineering Cybernetics Norwegian University of Science and Technology

ISBN: (纸本)9781479902255

In this paper, the Finite Control Set Model Predictive Control (FSC-MPC) is used to control the multi-level neutral point clamped converter of each station in a four-terminal VSC-based Multi-Terminal HVDC system (MTDC). Three stations of MTDC are controlled to track desired reference power and one station is controlled to keep the DC side voltage in the desired value. The FCS-MPC controller is designed to keep a tradeoff between current tracking error, switching frequency and capacitor voltage balancing. The measurement and computation delay is considered by applying two steps ahead prediction in control algorithm. The validity of the proposed controller is confirmed by simulations.

关键词： Multi-terminal HVDC Finite Control Set MPC Neutral point clamped converters Optimization HVDC SYSTEMS Predictive control multiterminal Converters STATIONS computer algorithms tradeoffs DC side Switches

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Adaptive Glide Slope Control for Autonomous Airdrop Systems

Adaptive Glide Slope Control for Autonomous Airdrop Systems

引用

American Control Conference

作者： Michael Ward Mark Costello Department of Aerospace Engineering Georgia Institute of Technology Atlanta GA

ISBN: (纸本)9781457710957

Airdrop systems provide a unique capability of delivering large payloads to undeveloped and inaccessible locations. Guided airdrop systems based on steerable, ram-air parafoils have been developed with the goal of improving the precision and accuracy of air-dropped payload delivery. In practice, the gliding ability of the ram-air canopies can actually create major problems for airdrop systems by making them more susceptible to winds and allowing them to achieve far greater miss distances than were previously possible. Research and development work on guided airdrop systems has focused primarily on improving the guidance algorithm. By comparison, the navigation and control algorithms have changed little since the initial guided systems were developed. Furthermore, the control mechanisms have not changed since the invention of the ram-air canopy in the 1960's. This work seeks an improvement in landing accuracy over current state of the art airdrop systems through the incorporation of advanced control algorithms and novel control mechanisms. The key concepts utilized are system identification in real-time during each flight and glide slope control through in-flight incidence angle variation coupled with symmetric trailing edge brake deflection. Simulation and flight test results demonstrate a factor of two improvement in landing accuracy with the use of glide slope control. Simulation results also demonstrate that the adaptation of internal models with in-flight system identification can dramatically improve landing accuracy in situations where there is significant uncertainty in the system flight characteristics.

关键词： Glide slope computer algorithms System identification cage set FLIGHT TESTS control mechanism Inventions Payload

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Compliant Attitude Control and Stepping Strategy for Balance Recovery with the Humanoid COMAN

Compliant Attitude Control and Stepping Strategy for Balance...

引用

IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Nicolas Perrin Nikolaos Tsagarakis Darwin G. Caldwell department of Advanced Robotics Istituto Italiano di Tecnologia Via Morego 30 16163 Genova

ISBN: (纸本)9781467363563

In this paper we describe an approach for humanoid robot balance recovery that combines a novel attitude control algorithm adding compliance to the robot's behavior and increasing the smoothness of its motion, and an omnidirectional stepping strategy that can trigger one or two steps based on a measured disturbance vector. The proposed method is validated through experiments with the inherently compliant humanoid COMAN.

关键词： attitude control Humanoid stepping computer algorithms

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A Novel ρ-q/Distortion Model for H.264 Rate Control Algorithm

A Novel ρ-q/Distortion Model for H.264 Rate Control Algorit...

引用

2010 International Conference on Audio,Language and Image Processing(2010年音频、语言与图像处理国际会议 ICALIP 2010)

作者： Mingjing Ai Lili Zhao Mingyang Tan State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing 100191 China

ISBN: (纸本)9781424458653

Rate control aims to maximize reconstructed video quality while adapting coding bit rate to the fluctuating network bandwidth. This paper proposes an easy rate control algorithm for H.264 video coding based on a novel ρ -q/Distortion model, whose data line shows quite a pleasing goodness-of-fit. Experimental results have demonstrated that, compared with rate control mechanism suggested in H.264 reference software, the proposed model provides a better reconstructed visual quality with a coding gain up to 0.37dB as well as much smaller bit rate control error with a maximum reduced bit rate up to 2.04kbps.

关键词： rate control Bit rate data line Video coding coding gain control mechanism computer algorithms

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Performance Analysis of Single Phase Series Active Compensator using Control Algorithm based on Unit Vector Generation

Performance Analysis of Single Phase Series Active Compensat...

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Innovative Trends and Advances in Engineering and Technology (ICITAET), International Conference on

作者： Nivedita S. Pande Anshu Choudhary Department of Electrical Engg. Rajiv Gandhi College of Engg.& Research Nagpur India Department of Electrical Engg. G H Raisony Institute of Engineering and Technology Nagpur India

ISBN: (数字)9781728119014

ISBN: (纸本)9781728119021

A deterioration of the power quality is a major concern due to harmonics injected by the non-linearity of the consumer loads which are specially power electronic devices (Rectifier Load). A single phase Diode Bridge Rectifier (DBR) draws non-linear current thus degrading the power quality at the PCC. This paper focuses on the single phase series active compensator to alleviate the voltage and current harmonics under non-linear load condition. A DC link capacitor is shared between VSI and single phase DBR so as to reduce the component requirement and to resist the AC mains side voltage variations. The compensator behavior has been analyzed graphically with the single phase DBR as a non-linear load. To confirm the efficacy of the suggested system an extensive digital simulation has been carried out in MATLAB/Simulink environment.

关键词： Series Active Power Filter (SAPF) voltage fed type non-linear load Diode Bridge Rectifier (DBR) Voltage Source Inverter (VSI) Unit vector based control algorithm Total Harmonic Distortion (THD) Point of Common Coupling (PCC) Power quality single phase computer algorithms Distributed Bragg reflectors dc-link capacitor Unit vector current harmonics voltage source inverter load condition VOLTAGE graphically harmonics nonlinearity Rectifiers

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An Intelligent System-Centric Control Approach to Power System Stabilization using Linear Adaptive and Optimal DHP Controller

An Intelligent System-Centric Control Approach to Power Syst...

引用

IEEE Power and Energy Society General Meeting

作者： Gerald Swann Sukumar Kamalasadan University of West Florida University of North Carolina

ISBN: (纸本)9781457710001

In this paper, we propose an intelligent approach to power system stabilization using a system-centric controller. This architecture uses a control algorithm based on a supervisory loop concept implemented with a system centric controller combining both a Dual Heuristic Programming (DHP) and Model Reference Adaptive Controller (MRAC) controller. The controller performance is tested on a Single Machine Infinite Bus (SMIB) power network and also on a five generator, eight bus, two area power network. Simulation studies indicate that the proposed controller is capable of improving the stabilization of the generator over the use of MRAC alone while continuously improving its performance through the use of online learning.

关键词： Intelligent Adaptive Control Power System Stabilization Intelligent controllers Intelligent supervisory loop System-centric controller intelligent controller Controllers Intelligent systems computer algorithms e-learning dynamos power systems model reference adaptive control Power grids

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A New Control Technique for Dual Stator Induction Generator Used in Standalone Applications

A New Control Technique for Dual Stator Induction Generator ...

引用

Annual Conference of the IEEE Industrial Electronics Society

作者： Saptarshi Basak Chandan Chakraborty Department of Electrical Engineering Indian Institute of Technology Kharagpur WB-721302 India

ISBN: (纸本)9781479917631

Brushless Generation Systems are currently in great demand for remote area micro-grid application. Dual Stator Winding Induction Generator (DSWIG), having two windings on the stator of same pole configuration and a squirrel cage rotor, has been identified as one of the suitable candidates for such application. In most of the configurations proposed so far, one of the winding is responsible for power extraction and the other for maintaining desired excitation. This paper proposes a control algorithm which facilitates power extraction through both the stator windings. MATLAB/SIMULINK based simulation studies illustrate the efficacy of the control method. A dSPACE 1103 based laboratory prototype has been developed and experimental results are presented.

关键词： Brushless Generation Systems Dual Stator Winding Induction Generator Micro-Grid Renewable Energy Extraction power extraction Control Methods squirrel-cage rotor Control technology MICRO-GRID Induction generators Stators Stator windings computer algorithms windings winding (process) Dual

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