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Power measurement under nonsinusoidal and noisy conditions

Power measurement under nonsinusoidal and noisy conditions

引用

IEEE inst.umentation 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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Optimal preview control applied to terrain following flight

Optimal preview control applied to terrain following flight

引用

IEEE Conference on Decision and control

作者： Dongmei Li Di Zhou Zhenkun Hu Hengzhang Hu Department of Precision Instrument and Mechanics Tsinghua University Beijing China Department of Control Science and Engineering Harbin Institute of Technology Harbin China

ISBN: (纸本)0780370619

We adopt optimal preview control methodology to design a terrain following controller for cruise missile. In this methodology, both tracking errors and control increments are considered in a quadratic penalty function. An augmented error system that involves future command inputs is built. Thus, the preview control problem can be formulated as an optimal regulator problem. Integrating the general optimal servo system with preview feed-forward compensations that respectively feed forward future command inputs and future disturbances, produces an optimal preview servo system. In the terrain following system, the flight altitude of cruise missile is the command input and its future information can be known a priori. The wind is viewed as the disturbance in the system and is not previewable. Hence, we designed a terrain following controller with a basic state feedback, and a feed-forward compensation for future altitude information while regarding the wind as a constant signal. Simulation results show that the performance of the terrain following system with such an optimal preview controller is improved dramatically.

关键词： Optimal control Missiles Servomechanisms Feedforward systems Design methodology Error correction Regulators Feeds Signal design State feedback

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A new stability condition for second-order linear systems 6

A new stability condition for second-order linear systems

引用

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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Robust pole assignment in descriptor linear systems via state feedback 6

Robust pole assignment in descriptor linear systems via stat...

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6th European control Conference, ECC 2001

作者： Duan, G.R. Nichols, N.K. Liu, G.P. School of Mechanical and Manufacturing Engineering Queen's University of Belfast Stranmillis Road BelfastBT9 5AH United Kingdom Department of Mathematics University of Reading ReadingRG6 6AF 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 Engineering and Science Harbin Institute of Technology Harbin150001 China

ISBN: (纸本)9783952417362

The problem of eigenvalue assignment with minimum sensitivity in multivariable descriptor linear systems via state feedback is considered. Based on the perturbation theory of generalized eigenvalues of matrix pairs, the sensitivity measures of the closed-loop finite eigenvalues are established in terms of the closed-loop normalized right and left eigenvectors. By combining these measures with a recently proposed general parametric eigenstructure assignment result for descriptor linear systems via state feedback, the robust pole assignment problem is converted into an independent minimization problem. The optimality of the obtained solution to the robust pole assignment problem is totally dependent on the solution to the independent minimization problem. The closed-loop eigenvalues are also taken as a part of the design parameters and are optimized, together with the other degrees of freedom, within certain desired regions on the complex plane. The approach takes numerical stability into consideration and also gives good robustness for the closed-loop regularity. © 2001 EUCA.

关键词： State feedback

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A new stability condition for second-order linear systems

A new stability condition for second-order linear systems

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European control Conference (ECC)

作者： G. R. Duan G. P. Liu S. Thompson School of Mechanical and Manufacturing Engineering The Queen's University of Belfast Belfast UK Department of Control Science and Engineering Harbin Institute of Technology Harbin P. R. China Materials Manufacturing Eng. and Management University Park U.K

关键词： Linear systems Stability analysis Symmetric matrices Robustness Lyapunov methods control systems Matrix converters

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A new method of desired gait synthesis in biped robot

A new method of desired gait synthesis in biped robot

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World Congress on Intelligent control and Automation (WCICA)

作者： Yongxue Zhang Qiang Wang Wenyi Qiang Peichen Fu Department of Control Science and Engineering Harbin Institute of Technology Harbin China

The paper presents a new method for generating the desired gaits in biped robot based on the reactive force between the feet and ground. The relation between the reactive force and joint motion is derived using the D'Almbert principle. In view of stale walking, the zero moment point (ZMP) stability criterion must be included in the desired gait generation. The proposed method utilizes aforesaid relation and stability principle to generate the desired joint trajectories. Meanwhile, desired motion trajectories and desired ZMP trajectories are also considered. The desired trajectory of the ZMP is determined by a fuzzy logic based on the human locomotion. The proposed method can reduce the motion range of the trunk, and can be applied to both the single foot supporting phase and double feet supporting phase by changing the restraining condition to the swinging leg.

关键词： Legged locomotion Orbital robotics Humans Leg Robot vision systems Stability criteria Foot Robot control Fuzzy logic Mobile robots

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Robust guidance law for space interception

Robust guidance law for space interception

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World Congress on Intelligent control and Automation (WCICA)

作者： Di Zhou Fulian Duan Department of Control Science and Engineering Harbin Institute of Technology Harbin China Department of Physics Harbin Normal University Harbin China

In space interception, a linear time-varying model is established to describe the missile-target related line-of-sight (LOS) motion, where the guidance parameter variations and target maneuvers are regarded as gain bounded disturbances. From this model, a robust guidance law of homing-missile is derived and its robustness against.the gain bounded uncertainty is proved by Lyapunov-like approach. Simulation results obtained demonstrate the effectiveness of the presented guidance method.

关键词： Robustness Sliding mode control Missiles Acceleration Space technology Robust control Adaptive control Navigation Motion control Uncertainty

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Sliding mode model predictive control with terminal constraints

Sliding mode model predictive control with terminal constrai...

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World Congress on Intelligent control and Automation (WCICA)

作者： Jiansuo Zhou Zhiyuan Liu Run Pei Dept. of Control Sci. & Eng. Harbin Inst. of Technol. China Department of Science and Engineering Harbin Institute of Technology Harbin Heilongjiang China

A new model predictive control scheme is proposed, which combines the receding horizon control and sliding mode variable structure control. By predicting the system states, the pre-designed switching function is predicted, then the control law can be found by solving the constrained open-loop optimal control problem based on the given cost function. The current control is implemented, and at the next sampling time the optimizing procedure is repeated. The proposed scheme has advantage of receding horizon control and sliding mode variable structure control, can deal with constraints online, and has strong robustness on the sliding surface. Furthermore, by constraining terminal sliding mode to be zero, the stability of closed-loop systems is guaranteed. Another scheme, which relaxes equality constraints to inequality constraints, is suggested for less calculation. In addition, the proposed method can be extended to nonlinear systems, and a nonlinear sliding mode predictive control scheme is acquired.

关键词： Predictive models Predictive control Open loop systems Sliding mode control Optimal control control systems Cost function Current control Sampling methods Robust control

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Complexity scalable audio coding algorithm based on wavelet packet decomposition

Complexity scalable audio coding algorithm based on wavelet ...

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International Conference on Signal Processing Proceedings (ICSP)

作者： He Dongmei Gao Wen Wu Jiangqin Dept. of Comput. Sci. & Eng. Harbin Inst. of Technol. China Department of Computer Science and Engineering Harbin Institute of Technology Harbin

In this paper, a complexity scalable audio coding algorithm based on wavelet packet decomposition is proposed. The incomplete wavelet packet decomposition with the property of complexity scalability to the signals is described in this paper. The zerotree coding of the coefficients is implemented which uses the characteristics of human ears and the self-similarity among different subbands wavelet coefficients. This algorithm cannot only be used to achieve transparent quality reconstruction audio at low bit rate, but also enable to support complexity scalable coding and multirate scalable coding. Audio encoding and decoding can be realized in real-time utilizing this algorithm on computers with different levels of computational power. The experimental results indicate that this algorithm is of practical value to the real-time multimedia applications.

关键词： Audio coding Wavelet packets Scalability Humans Ear Wavelet coefficients Bit rate Encoding Decoding Application software

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An environment adaptation method for robust speech recognition

An environment adaptation method for robust speech recogniti...

引用

International Conference on Signal Processing Proceedings (ICSP)

作者： Han Ji Qing Zhang Lei Wang Chengfa Dept. of Comput. Sci. & Eng. Harbin Inst. of Technol. China Department of Computer Science and Engineering Harbin Institute of Technology China

It is well known that differences between training and testing environments seriously affect speech recognition accuracy. Several environment adaptation techniques have been proposed for eliminating environmental difference, and they are effective when the adaptation data in the testing environment is available beforehand. However, testing environments are not always known beforehand. Therefore, a new framework, which uses testing utterances themselves for adaptation, is effective to cope with such variation. In this paper, a method of testing environment adaptation is proposed, which gradually learns the features of testing environment as the testing procedure, and does not need to get some testing samples beforehand.

关键词： Robustness Speech recognition Acoustic testing Nonlinear distortion Acoustic distortion Additive noise Cepstral analysis Speech enhancement Working environment noise Training data

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