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International Conference on Molecular Beam Epitaxy (MBE)

作者： I. Farrer M.J. Murphy R.M. Thompson N.S. Beattie D.A. Ritchie A.J. Shields Cavendish Laboratory University of Cambridge Cambridge UK Department of Control Science and Engineering Harbin Institute of Technology Harbin China Cambridge Research Laboratory Toshiba Research Europe Limited Cambridge UK

The formation of self-assembled quantum dots (SAQDs) during the growth of epitaxial materials is of great interest for optical applications due to the high density of dots which can be achieved in comparison with lithographic patterning techniques. Much of the research in this field has been directed towards the systems which display a type-I band alignment such as In(Ga)As/GaAs. In these structures both the electrons and holes are confined within the dots themselves.

关键词： Temperature Gallium arsenide Quantum dots US department of Transportation Sun Time of arrival estimation

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Robust H∞ control with Exponent Stability for Time-Delay Uncertain Systems

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Journal of Systems engineering and Electronics 2002年第1期000卷

作者： Luo Xiaoyuan GUAN Xinping Long Chengnian Duan Guangren Institute of Electrical Engineering， Yanshan University， Qinhuangdao 066004， P. R. China Department of Control Engineering， Harbin Institute of Technology， Harbin 150001， P. R. China

This paper is concerned with the robust H∞ control with exponent stability for a class of time-delay uncertain systems. Attention is focused on the design of controllers such that the resulting closed-loop system not only is exponentially stable but also satisfies, H∞ disturbance attenuance via memoryless state feedback control. Sufficient conditions for feasibility are obtained in terms of LMIs. Moreover, optimization of LMI is considered such that the controller with low gain parameters is formulated.

关键词： Uncertain system Time delay Robust H∞ control Exponent attenuance LMI

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Error compensation on precision machine tool servo control system based on digital concave filter

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Journal of harbin institute of technology(New Series) 2001年第4期8卷 389-393页

作者：王立松苏宝库张晶董申 Dept. of Control Theory and Engineering Harbin Institute of Technology Dept. of Computer Science and Engineering Harbin Institute of Technology Dept. of Mechanical Engineering and Automation Harbin Institute of Technology

It is concluded from the results of testing the frequency characteristics of the sub micron precision machine tool servo control system, that the existence of several oscillating modalities is the main factor that affects the performance of the control system. To compensate for this effect,several concave filters are utilized in the system to improve the control accuracy. The feasibility of compensating for several oscillating modalities with a single concave filter is also studied. By applying a modified Butterworth concave filter to the practical system, the maximum stable state output error remains under ±10 nm in the closed loop positioning system.

关键词： precision machine tool concave filter oscillating modality

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Testing and Modeling of Vehicular Hydraulic Braking System with Linear Solenoid Valves

Testing and Modeling of Vehicular Hydraulic Braking System w...

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The 2011 International Conference on Smart Materials and Nanotechnology in engineering (ICSMCE2011)

作者： Houhua Jing Zhiyuan Liu Hong Chen Department of Control Science and Engineering Harbin Institute of Technology Department of Control Science and Engineering Jilin University

For vehicular hydraulic braking system using linear solenoid valves, an experiment setup is built for test, and the nonlinear dynamic model is developed using a combination of mechanistic and empirical methodsUnknown parameters are identified using least squaresThe model can be used for simulation and pressure estimation effectivelyIn order to use this model in controller design, a simplification is also performed and a polynomial static model is obtained between the pressure rate and the driving signalModel validations are performed by comparing the simulated and measured curves.

关键词： Hydraulic braking system Linear solenoid valve Modeling

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A new nonlinear model predictive control scheme for discrete-time system based on sliding mode control

A new nonlinear model predictive control scheme for discrete...

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American control Conference (ACC)

作者： Jian-Suo Zhou Zhi-Yuan Liu Run Pei Department of Control Science and Engineering Harbin Institute of Technology Harbin Heilongjiang China

Nonlinear model predictive control, which is conceptually similar to its linear counterpart except that nonlinear dynamic model is used for process prediction and optimization, is a developing control field. The proposed nonlinear model predictive control scheme, which is called nonlinear sliding mode model predictive control, integrates model predictive control and sliding mode variable structure control. A feasible dual-mode control scheme is presented in the paper, sliding mode predictive controller is implemented while the system state is outside the terminal region, besides sliding mode variable structure control designed off-line is used. The resulting control scheme has strong points of the two control methods. By predicting the pre-designed switching function, the predictive control sequence can be found by solving constrained open-loop optimal control problem, and the current control is implemented. At next sampling time the optimizing procedure is repeated. By constraining terminal sliding mode with an inequality, the state is steered into the predesigned sliding mode region, then the closed-loop stability is proved, and furthermore the system performance is analyzed. With some conditions, the method can be extended to a quasi-infinite horizon formulation. Simulation results show that less calculation is needed.

关键词： Predictive models Predictive control Sliding mode control Open loop systems control systems Optimal control Current control Sampling methods Stability analysis System performance

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A new stability condition for second-order linear systems 6

A new stability condition for second-order linear systems

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6th European control Conference, ECC 2001

作者： Duan, G.R. Liu, G.P. Thompson, S. School of Mechanical and Manufacturing Engineering Queen's University of Belfast Stranmillis Road BelfastBT9 5AH United Kingdom School of Mechanical Materials Manufacturing Eng. and Management University of Nottingham University Park NottinghamNG7 2RD United Kingdom Research Office for Control Systems Theory Department of Control Science and Engineering Harbin Institute of Technology Harbin150001 China

ISBN: (纸本)9783952417362

Based on the Lyapunov Stability Theorem for linear systems, a very simple sufficient stability condition is derived for second-order linear systems in terms of the positive definiteness of the system coefficient matrices. This condition generalizes some known result and may have important applications in robust stability analysis and robust stabilization of uncertain second-order linear systems. © 2001 EUCA.

关键词： Linear systems

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Efficient algorithms for speech pitch estimation

Efficient algorithms for speech pitch estimation

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International Symposium on Intelligent Multimedia, Video and Speech Processing

作者： Xiao-Dan Mei Jengshyang Pan Sheng-He Sun Department of Automatic Test and Control Harbin Institute of Technology Harbin China Department of Electronic Engineering Kaohsiung Institute of Technology Taiwan

ISBN: (纸本)9628576623

Two novel algorithms for speech pitch estimation are presented. One is based on the average magnitude difference function (AMDF), the other is based on auto-correlation pitch detection algorithms (PDA). Accurate and stable pitch estimation can be obtained by using these fast algorithms. The simulation results prove the effectiveness of these algorithms.

关键词： Speech analysis Hidden Markov models Autocorrelation Equations Sun Electronic equipment testing Automatic testing Automatic control Digital communication Frequency estimation

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Power measurement under nonsinusoidal and noisy conditions

Power measurement under nonsinusoidal and noisy conditions

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IEEE Instrumentation and Measurement technology Conference

作者： Jian Qiu Zhang Yi Shen Advanced Instrumentation and Control Research Center School of Engineering University of Greenwich Kent UK Department of Control Science and Engineering Harbin Institute of Technology Harbin China

ISBN: (纸本)0780366468

Distorted power measurement under nonsinusoidal and noisy conditions is considered. A new window function method which is efficiently combines the advantage of an adaptive window, totally eliminating leakage errors, with that of a conventional window, a good attenuation performance for noise signals, is proposed to reduce the measurement errors of distorted power under nonsinusoidal and noisy conditions. The effectiveness of the new method has been verified by simulation results.

关键词： Power measurement Power system harmonics Noise reduction Power system simulation Sampling methods Frequency response Pollution measurement Power engineering and energy Distortion measurement Industrial power systems

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An approach to fault diagnosis based on a hierarchical information fusion scheme [and turbine application]

An approach to fault diagnosis based on a hierarchical infor...

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IEEE Instrumentation and Measurement technology Conference

作者： Qiang Fu Yi Shen Jian Qiu Zhang Shengli Liu Department of Control Science and Engineering Harbin Institute of Technology Harbin China School of Engineering University of Greenwich Kent UK

ISBN: (纸本)0780366468

A novel approach, based on a hierarchical information fusion scheme and using the different symptoms of the faults in the various locations of a system, to fault diagnosis of the system is presented. Firstly, the data fusion of various location sensors in a system is used to guarantee the reliability and accuracy of measurements. Then, the different symptoms of the faults in various locations of a system are classified via multiple neural networks to obtain local decisions. These local decisions are fused by fuzzy integral in which the relative importance of each network is also considered. Finally, we apply this approach to a model of a turbine system. The simulation results verify the effectiveness of the proposed method.

关键词： Fault diagnosis Sensor systems Sensor fusion Pollution measurement Sensor phenomena and characterization Neural networks Turbines Signal processing Availability Signal resolution

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Design and implementation of concatenated encoder

Design and implementation of concatenated encoder

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International Conference on ASIC

作者： You Yu-xin Wang Jin-xiang Piao Xiu-ri Lai Feng-chang Ye Yi-zheng Microelectronics Center Harbin Institute of Technology Harbin China Control department Harbin Electrical Engineering Company Limited Harbin China

Presented a concatenated encoder that has very wide applications in DVB, HDTV and satellite communication systems. It was mainly composed of punctured convolutional encoder, convolutional interleaver, and Reed-Solomon encoder. In the convolutional interleaver, an over-clocking scheme is employed to guarantee the speed limits. Furthermore, a finite field multiplier of composite fields was adapted to optimize area and power in RS encoder, which reduced the area near to one half compared to the conventional RS (204,188) encoder. The proposed concatenated encoder has about 3700 gates except RAM model and it has good compliance with EN300 421.

关键词： Concatenated codes Convolutional codes Reed-Solomon codes Decoding Galois fields Polynomials Digital video broadcasting Viterbi algorithm Error correction codes Microelectronics

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