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检索条件"主题词=Computer algorithms"

共 3274 条记录，以下是2681-2690 订阅

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Development of a Control Algorithm for a Hybrid Structure Surgical Manipulator

Development of a Control Algorithm for a Hybrid Structure Su...

引用

IEEE International Conference on Cyber Technology in Automation, Control, and Intelligent Systems

作者： Quanquan Liu Lihong Duan Bo Zhang Xin Zhang Tongyang Sun Chunbao Wang Qing Shi Wanfeng Shang Yajing Shen Zhuohua Lin Zhengzhi Wu Weiguang Li Masakatsu G. Fujie Shenzhen Institute of Geriatrics Faculty of Engineering Waseda University Shenzhen Dapeng New District Nan'ao People's Hospital School of Mechanical and Automotive Engineering South China University of Technology The Mechanical and Biomedical Engineering City University of Hongkong

ISBN: (纸本)9781538604915

Minimally invasive techniques bring revolutionary progress in surgical manipulation via reduced incision, less blood loss and shorten hospital stay. Robotic assisted minimally invasive surgeries have not only benefited patient on further cosmetic surgical performance, but also surgeon on improved manipulability by flexible mechanism. In order to achieve necessary dexterity, we developed a multiple degree of freedoms (DOFs) manipulator for surgical assistance. The surgical manipulator consists of two serial bendable segments, and each bendable segment is composed of three parallel universal-joint based bending linkages. The parallel configuration in a single bendable segment can achieve Omni-bending orientation in space, and the hybrid structure enlarges manipulator's flexibility via redundancy mechanism. A shape optimization algorithm is proposed to construct the inverse kinematics of the redundancy structure. The bending experiments of the surgical manipulator to evaluate the positioning accuracy are performed, the experimental results demonstrated that the mean positioning error of the end effector is within 1.2 mm. It is capable of providing a solution for accurate manipulation of soft tissue.

关键词： computer algorithms hybrid structures end effectors Surgery redundancy inverse kinematics positioning accuracy minimally invasive surgery HYBRID

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A Robust Multi-objective Compatible Optimization Control Algorithm for Traffic Signal Control

A Robust Multi-objective Compatible Optimization Control Alg...

引用

IEEE International Conference on Intelligent Transportation Systems

作者： Juan Chen SHU-UTS SILC Bus. Sch. Shanghai Univ. Shanghai China

ISBN: (纸本)9781479960798

Conventional methods used for solving traffic signal control problems used the mean value of traffic flow as the input of traffic system which may differ greatly from the real circumstance. In this paper, we propose a modified robust multi-objective compatible optimization control(RMOOC) algorithm which adopting interval or region control objectives instead of point control objectives, and a min-max robust optimization model is proposed to solve the traffic signal control problem, Simulation results show that better performance may be obtained without loss of too much optimality when the variation of traffic flow is in a limited region, and the proposed robust multi-objective compatible optimization control algorithm is effective in coordinating network control and decreasing delay.

关键词： minimax techniques optimal control road traffic control robust control signalling RMOOC algorithm interval control objectives mean value min-max robust optimization model modified robust multiobjective compatible optimization control algorithm network control optimality point control objectives region control objectives traffic flow traffic signal control problems traffic system Delays Junctions Optimization Robustness Sociology Statistics Vehicles compatible optimization control robust traffic control uncertainty traffic systems Traffic flow network control minimax techniques Ran Traffic Control mean value computer algorithms Sociology optimality Junction Device Component Robust control Robustness vehicle Traffic signals Optimal control

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A Modified Static Voltage Control Algorithm based on Optimal Multiplier Method and Dynamic Generation Characteristics

A Modified Static Voltage Control Algorithm based on Optimal...

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IEEE Power and Energy Society General Meeting

作者： Bo Gong Siemens PTI

ISBN: (纸本)9781457710001

With the fast development of wide area measurements, communication techniques and dynamic security assessment (DSA) tools in power systems, dynamics based stability control strategies are attracting more and more research attentions as an effect way to handle complicated control objectives and improve control accuracy. However, due to its heavily relying on the time domain simulation, the computation burden of these dynamic based methods has also been greatly increased. On the other hand, static methods, which have been developed for years based on simplifications of the dynamic systems, are constantly appreciated by industries for their maturity, fast computation time and practical for online applications. In this paper, in order to improve the accuracy of static voltage stability control algorithms, the rules of simplifying a generator reactive power limitation, which is one of the most important contributing factors for voltage collapses, has been reviewed. A refined static model is proposed based on considering this limitation characteristics in a dynamic control framework. The static voltage stability control is computed by iteratively applying an optimal multiplier method. It shows that this method only add a small amount of computation burden compared to the original static method, while it can improve the control performance significantly during a dynamic process. An example voltage collapse is discussed to illustrate the algorithm and provide comparisons.

关键词： stable control electrostatic pressure control performance Voltage collapse control accuracy Multiplying circuits Dynamic systems computer algorithms computational time

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Haptic paddle and fuzzy based virtual environment model control system as a didactic tool

Haptic paddle and fuzzy based virtual environment model cont...

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Int'l Workshop on Mechatronics (MECATRONICS) , France-Japan & Europe-Asia Congress on and Research and Education in Mechatronics (REM)

作者： Senka Krivić Admir Kaknjo Muhidin Hujdur Nadir Zubović Emir Sokić Faculty of Electrical Engineering Sarajevo Sarajevo Bosnia and Herzegovina

ISBN: (纸本)9781467347709

The paper deals with design, construction and implementation of bilateral control system using fuzzy regulation. The aim of paper is implementation of a system which can be used as a didactic tool for better understanding of bilateral control concepts, as well as a base for further work. The system is composed of mechanical model of haptic paddle with one degree of freedom and virtual model of haptic paddle and its environment, interconnected using acquisition card. Virtual environments control is created using fuzzy logic. After implementing control algorithm and connecting two models - the mechanical and virtual, the functionality of system was confirmed by experimental data.

关键词： haptic virtual reality fuzzy position dependent control speed dependent control friction force Fuzzy friction force Haptic Device Component Touch virtual reality Blades Design And Construction Virtual environments computer algorithms control systems bilateral control Model control

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Power Quality Enhancement of Grid Integrated Solar PV System based on Adaptive Noise Reduction Control

Power Quality Enhancement of Grid Integrated Solar PV System...

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IEEE Power and Energy Society General Meeting

作者： Bhim Singh Sagar Goel Ankit Singhal Ankur Garg Chinmay Jain Indian Institute of Technology Iowa State University

ISBN: (纸本)9781467380416

This paper presents implementation of a two stage three phase PV-grid interfaced system with a three phase VSC which has been utilized as a multifunctional device. Adaptive noise reduction technique is used to control multifunctional VSC which transfers the active power from PV system to the grid and also works as an active power filter (APF) to improve power quality at AC mains. The control algorithm presented here has a fast and accurate dynamic response. The proposed SPV energy system has been implemented with linear and non-linear load to show harmonic elimination, load balancing and power factor correction.

关键词： Active power filter Power quality Renewable solar PV grid interface Smart inverter VSC Power quality Variable structure control active power filter grids Solar Photovoltaic System Grid computer algorithms noise reduction technique Power factor correction active power Solar PV

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algorithms – ESA 2005 2005

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丛书名： Lecture Notes in computer Science

2005年

作者： Gerth S. Brodal Stefano Leonardi

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Approximation, Randomization and Combinatorial Optimization. algorithms and Techniques 2008

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丛书名： Lecture Notes in computer Science

2008年

作者： Ashish Goel Klaus Jansen José Rolim Ronitt Rubinfeld

ISBN: (数字)9783540853633

ISBN: (纸本)9783540853626

This book constitutes the joint refereed proceedings of the 11th International Workshop on Approximation algorithms for Combinatorial Optimization Problems, APPROX 2008 and the 12th International Workshop on Randomization and Computation, RANDOM 2008, held in Boston, MA, USA, in August 2008. The 20 revised full papers of the APPROX 2008 workshop were carefully reviewed and selected from 42 submissions and focus on algorithmic and complexity issues surrounding the development of efficient approximate solutions to computationally difficult problems. RANDOM 2008 is concerned with applications of randomness to computational and combinatorial problems and accounts for 27 revised full papers, also diligently reviewed and selected out of 52 workshop submissions.

关键词： computer science Statistical methods Congresses. computer algorithms Congresses. Approximation theory Data processing Congresses. Combinatorial optimization Data processing Congresses.

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Decentralized Event-Triggered Control for Leader-follower Consensus

Decentralized Event-Triggered Control for Leader-follower Co...

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IEEE Annual Conference on Decision and Control

作者： Teng-Hu Cheng Zhen Kan John M. Shea Warren E. Dixon Department of Mechanical and Aerospace Engineering University of Florida Gainesville FL 32611-6250 USA Department of Electrical and Computer Engineering University of Florida Gainesville FL 32611-6250 USA

ISBN: (纸本)9781467360890

A decentralized event-triggered control scheme for leader-follower consensus is developed. The approach aims to reduce inter-agent communication while ensuring asymptotic leader-follower consensus. The objective is achieved by designing a control algorithm that uses the estimates of neighbors' states for feedback and only updates the estimates through communication when events are triggered. The update events are determined by a decentralized trigger condition, designed from the stability analysis, such that the control ensures asymptotic leader-follower consensus with only intermittent communication. The effectiveness of reducing inter-agent communication is shown by developing a positive constant lower bound of the minimum inter-event interval. Since switched dynamics are considered, Zeno execution is proven to be avoided, and Lyapunov-based convergence analysis is provided to ensure the asymptotic leader-follower consensus. Simulation results are provided to demonstrate the effectiveness of the developed control strategy.

关键词： control strategy Event trigger Decentralized Communication Research Stability analysis computer algorithms Feedback asymptotic

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Active Damping for Grid-Connected LCL Filter Based on Optimum Controller Design Using Injected Grid Current Feedback only

Active Damping for Grid-Connected LCL Filter Based on Optimu...

引用

IEEE Energy Conversion Congress and Exposition

作者： Mahmoud A. Gaafar Masahito Shoyama Graduate School of Information Science & Electrical Engineering Kyushu University Fukuoka Japan

ISBN: (纸本)9781479957774

LCL filters are widely used for grid-connected converters because its superiority over L and LC filters, however the resonance problem produced by these filters requires a more effort in the design process to damp it. Active damping techniques which use the sensed capacitor current are widely used in this regard to solve this problem;however this requires an increase in the number of sensors. Based on the optimum design for PI controller, this paper introduces an active damping method based on the capacitor estimated current without increase in the number of sensors. This is achieved by using an additional observer loop as a feedback in the controller loop to estimate the capacitor current. The simulation results for the proposed control algorithm are introduced in this work.

关键词： Filters absorption of shock grid current Optimal design computer algorithms design process Feedback Sensors controller design

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Stability of Supervised Adaptive Control

Stability of Supervised Adaptive Control

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Proceedings of the 46th IEEE Conference on Decision and Control, Pages 5971-6447

作者： Eduardo J. Dozal-Mejorada B. Erik Ydstie Carnegie Mellon University Pittsburgh PA US Department of Chemical Engineering Case Western Reserve University USA

ISBN: (纸本)9781424414970;1424414970

A stability proof of a recently introduced supervised adaptive control algorithm is presented. The novel premise of the algorithm is its dual model architecture. The approach addresses the well known parameter burst and infinite drift phenomena. The stability result demonstrates that the dual model supervised adaptive control algorithm is robust with respect to small model/plant mismatch and bounded disturbances. Ydstie's Switching Lemma and Lyapunov stability results constitute the foundations of the theoretical results. Monte Carlo simulations illustrate the algorithm's potential.

关键词： computer algorithms adaptive control Lemma algorithms Dual mode FOUNDATION Foundations Dual Lyapunov methods

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