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IEEE PES Transmission and Distribution Conference and Exposition

作者： M.J. Mousavi K.L. Butler-Purry R. Gutierrez-Osuna M. Najafi Department of Electrical Engineering Power System Automation Laboratory Texas A and M University College Station TX USA Department of Electrical Engineering Power System Automation Laboratory College Station TX Department of Computer Science Texas A&M University College Station TX USA Department of Mechanical Engineering Texas A&M University College Station TX USA

This paper presents a feasibility study on the application of pattern analysis techniques to classify load change transients and incipient abnormalities in an underground distribution cable lateral. The data were collected using an on-line monitoring system installed in a residential area in Dallas. A set of features obtained from wavelet packet analysis was evaluated. Methods of dimensionality reduction were employed to overcome the curse of dimensionality while preserving a good classification rate. The classification results using k-nearest-neighbor (KNN) classifiers show that the proposed methodology can be used to classify load change transients and incipient abnormalities.

关键词： Transient analysis Pattern analysis Tellurium Power cables Power system transients Wavelet analysis Wavelet packets Automation Laboratories Electrical fault detection

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Research on Simulation and Test of the Nonlinear Responses for the Hydraulic Shock Absorber

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Journal of Donghua University(English Edition) 2003年第4期20卷 98-102页

作者：张建武刘延庆 School of Mechanical Engineering Shanghai Jiaotong University Shanghai 200030 China School of Mechanical Engineering Shanghai Jiaotong University Shanghai 200030 Chinaasically on the multi-body system dynamics the virtual prototype of the hydraulic shock absorber for the bench test is developed in the ADAMS environment. Dynamic behaviors of the absorber are studied by both computer simulation and real test. Numerical predictions of dynamic responses are produced by the established virtual prototype of the absorber and compared with experimental results. It has been shown from the comparison that the vibration behaviors of the prototype with hysteretic damping characteristics are considered to be more identical with the bench test results than those of the same prototype with piecewise linear damping properties are. The current virtual prototype of the shock absorber is correct and can be a developing terrace for the optimizing design of the absorber and matching capability of the whole car.

Basically on the multi-body system dynamics,the virtual prototype of the hydraulic shock absorber for the bench test is developed in the ADAMS *** behaviors of the absorber are studied by both computer simulation and real *** predictions of dynamic responses are produced by the established virtual prototype of the absorber and compared with experimental *** has been shown from the comparison that the vibration behaviors of the prototype with hysteretic damping characteristics are considered to be more identical with the bench test results than those of the same prototype with piecewise linear damping properties *** current virtual prototype of the shock absorber is correct and can be a developing terrace for the optimizing design of the absorber and matching capability of the whole car.

关键词： Shock absorber hysterctic damping Multi-body dynamics

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A controller design for reference signal with the N-th power of time

A controller design for reference signal with the N-th power...

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SICE Annual Conference

作者： M. Kosaka H. Uda H. Shibata Department of Mechanical Engineering Faculty of Science and Engineering Kinki University Higashi-Osaka Osaka Japan Department of Computer and System Sciences College of Engineering Osaka Prefecture University Sakai Osaka Japan

In this paper, we propose a new controller design method, where the identification technique, which directly acquires any order of reduced model, is applied to the feedforward controller design composed of time delays and inverse dynamics of a controlled object. By applying the proposed controller, the tracking error with reference signal of the N-th power of t becomes zero when the future reference signal is available. The resulting system has neither deterioration in the feedback characteristics nor increase in the tuning man-hour because feedforward controllers do not affect the feedback characteristics and the feedback controller can be designed with the accumulated know-how.

关键词： Signal design Error correction Control systems Feedback Proportional control Open loop systems Adaptive control Polynomials Signal processing Design engineering

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Cooperative control of two robots by remote operation

Cooperative control of two robots by remote operation

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SICE Annual Conference

作者： K. Okumura S. Fujii Z. Kang Department of Computer Mechanical System Engineering Daido Institute of Technology Daido-Cho Minarni-Ku Nagoya Chuden Computer Service Co. Inc. Naka-Ku Nagoya Japan

A cooperative control of two robots by remote operation is proposed. The two slave robots are controlled simultaneously by another remote master robot that is manipulated by a human operator. Force-reflection bilateral control method is adopted in the master and slave robots control to make the operator manipulate the robots smoothly. In order to make the two slave robots act cooperatively to catch, carry and set an object, two methods of hybrid control and impedance control are used and compared to control the two slave robots.

关键词： Robot control Force control Master-slave Control systems Robot sensing systems Medical robotics Force sensors Impedance Aging Intelligent robots

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Intelligent diagnosis method for plant machinery using wavelet transform, genetic programming and possibility theory

Intelligent diagnosis method for plant machinery using wavel...

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IEEE Region 10 International Conference TENCON

作者： Peng Chen T. Horie T. Toyota Zhengjia He Faculty of Computer Science and System Engineering Kyushu Institute of Technology Iizuka Fukuoka Japan Japan Condition Diagnosis Technology Laboratory Incorporated Kitakyushu Japan Department of Mechanical Engineering Xi‘an Jiaotong University Xi‘an China

This paper proposes an intelligent diagnosis method for plant machinery using wavelet transform (WT) genetic programming (GP) and possibility theory. The WT is used to extract feature spectra of each machine state from measured vibration signal for distinguishing faults. Excellent symptom parameters (SP) for detecting fault states are automatically generated by GP. The membership functions of symptom parameters are established using possibility theory for resolving the ambiguous diagnosis problems. The methods proposed in this paper are verified by applying them to the fault diagnosis of gear equipment.

关键词： Machine intelligence Machinery Wavelet transforms Genetic programming Possibility theory Vibration measurement Fault diagnosis Feature extraction Fault detection Signal resolution

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Vector velocimetry by using fiber-optic low coherence interferometers

Vector velocimetry by using fiber-optic low coherence interf...

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Optical Fiber Sensors Conference

作者： Y. Imai K. Tanaka Department of Computer Science and Electronics Kyushu Institute of Technology Iizuka-shi Fukuoka-ken Japan Department of Mechanical System Engineering Kyushu Institute of Technology Iizuka-shi Fukuoka-ken Japan

A new velocimetry using the four probing points system consisting of fiber-optic low-coherence interferometers are proposed and demonstrated. The proposed velocimetry is capable of measuring simultaneously the 3-D velocity vector (absolute velocity and the velocity direction). The velocity vector distribution along depth can also be measured in the present method by scanning the mirror positions in the reference arms. Moreover, the 3-D velocity vector distribution can be measured by sweeping the mirror position for z-direction distribution and by moving the fiber probes for x- and y-direction distribution. The high spatial resolution of the present method enables us to apply the present method to sensing for velocity vector distributions of a boundary layer in liquid flow or of a vortex flow, and of a living body, which are very important in the field of fluid mechanics and the practical application. It is very difficult in conventional methods to measure the velocity vector in these application areas.

关键词： Interferometers Interference Coherence Optical scattering Light scattering Particle scattering Signal processing Optical interferometry Probes Velocity measurement

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Iterative learning control with Smith time delay compensator for batch processes

Iterative learning control with Smith time delay compensator...

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American Control Conference (ACC)

作者： Jian-Xin Xu Tong Heng Lee Jing Xu Qiuping Hu S. Yamamoto Department of Electrical & Computer Engineering National University of Singapore Singapore Singapore Department of Mechanical System Engineering Kogakuin University Shinjuku Tokyo Japan

How to improve the control of batch processes is not an easy task because of modeling errors and time delays. In this work, iterative learning control (ILC) strategies, which can fully use previous batch control information and are attached to the existing control systems to improve tracking performance through repetition, are proposed for SISO processes which have uncertainties in modeling and time delays. The dynamics of the process are represented by transfer function plus pure time delay. The stability properties of the proposed strategies for batch processes in the presence of uncertainties in modeling and/or time. delays are analyzed in the frequency domain. Sufficient conditions guaranteeing convergence of tracking error are stated and proven. Simulation and experimental examples demonstrating these methods are presented.

关键词： Delay effects Uncertainty Process control Error correction Control system synthesis Transfer functions Stability analysis Frequency domain analysis Sufficient conditions Convergence

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Use of computational intelligence for corrosion damage assessment of aging aircraft panels

Use of computational intelligence for corrosion damage asses...

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2001 ASME International mechanical engineering Congress and Exposition

作者： Palakal, M.J. Pidaparti, R.M. Rebbapragada, S. Huang, J. Peeler, D.T. Department of Computer Science Indiana University Purdue University Indianapolis IN 46202 United States Department of Mechanical Engineering Indiana University Purdue University Indianapolis IN 46202 United States Air Force Research Laboratory System Support Division MLSA Dayton OH 45385 United States

This paper describes computational methods that have been developed to automatically detect and quantify corrosion on images of aircraft panels obtained using nondestructive inspection (NDI) techniques. Images obtained from NDI techniques are not directly suitable for corrosion analysis. We propose a multi-resolution wavelet analysis to segment the NDI images to isolate the corroded regions from the undamaged regions. Wavelet coefficients were extracted from each segment and subjected to a multivariate data analysis to obtain the most relevant features. These features are then used to identify the corroded region on the images and also to estimate the extent of damage, in terms of material loss, using backpropagation neural networks. Experiments were conducted to test the developed modules on images obtained from the Air Force Research Lab in Dayton, Ohio. The results obtained prove the feasibility and robustness of our approach in detecting the damaged regions and for estimating the material loss due to corrosion.

关键词： Aircraft parts and equipment

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Fuzzy control of nonlinear time-delay systems: stability and design issues

Fuzzy control of nonlinear time-delay systems: stability and...

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American Control Conference (ACC)

作者： Yongru Gu H.O. Wang K. Tanaka L.G. Bushnell Department of Elm. and Computer Engineering Duke University Durham NC USA Department of Mechanical Engineering and Intell. System University of Electro-Communications Chofu Tokyo Japan Department of Electrical Engineering University of Washington Seattle WA USA

A class of nonlinear time-delay systems based on the Takagi-Sugeno fuzzy model is defined. We investigate the delay-independent stability of this model. A model-based fuzzy stabilization design utilizing the concept of the so-called "parallel distributed compensation" is employed. The main idea of the controller design is to derive each control rule to compensate each rule of a fuzzy system. Also, the problem of H/sub /spl infin// control is considered. The associated control synthesis problems are formulated as linear matrix inequality problems.

关键词： Fuzzy control Stability Delay effects Fuzzy systems Control design Automatic control Takagi-Sugeno model Control systems Control system synthesis Algorithm design and analysis

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Feedback control for electromagnetic vibration feeder (application of two-degrees-of-freedom proportional plus integral plus derivative controller with nonlinear element)

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JSME International Journal, Series C: mechanical systems, Machine Elements and Manufacturing 2001年第1期44卷 44-52页

作者： Doi, Tomoharu Yoshida, Koji Tamai, Yutaka Kono, Katsuaki Naito, Kazufumi Ono, Toshiro Department of Systems and Control Engineering Faculty of Engineering Osaka Prefectural College of Technology 26-12 Saiwai-cho Neyagawa Osaka 572-8572 Japan Department of System Engineering Faculty of Computer Science and System Engineering Okayama Prefectural University 111 Kuboki Soja Okayama 719-1197 Japan Research and Development Department Ishida Co. Ltd. 959-1 Shimomagari Ritto-cho Kurita-gun Shiga 520-3026 Japan Department of Mechanical Systems Engineering College of Engineering Osaka Prefecture University 1 1 Gakuen-cho Sakai Osaka 599-8531 Japan

An electromagnetic-type vibratory feeder of is a typical transportation device used in automatic weighers. As existing feeders are driven by feedforward control, the so-called "firing angle control", the driver cannot negate sudden disturbances. In this study, we consider applying a feedback control for such a feeder system. First, we give the two details of modelings for the vibration part and for the electromagnetic force part. Next, a feedback control system is constructed for the electromagnetic vibration feeder for which we propose a two-degrees-of-freedom proportional plus integral plus derivative (PID) controller with nonlinear elements. Next, we apply the feedback control to the feeder with a standard trough. Finally, we consider a method compatible with many varieties of troughs by adjusting a nonlinear element. On the basis of the results of some experiments, we confirm that the two-degrees-of-freedom PID control is more effective than the conventional firing angle control.

关键词： Mechanics

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