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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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Algorithm for Three-Step Estimation of Transfer Function with Unknown Delay Steps and Order

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IFAC Proceedings Volumes 2000年第15期33卷 373-378页

作者： Mitsuki Mashino Fujio Ohkawa Kazushi Nakano Masayoshi Tomizuka Mechanics & Electronics Research Institute Fvkuoka Industrial Technology Center 3-6-1 Norimatsu Yahatanishi-ku Kitakyushu 807-0831 JAPAN Dept. of Control Engineering and Science Faculty of Computer & System Engineering Kyushu Institute of Technology Kawazu Iizuka 820-8502 JAPAN Dept. of Electronic Engineering The University of Electro- Communicatons 1-5-1 Chofu-ga-oka Chofu Tokyo 182-8585 JAPAN Dept. of Mechanical Engineering University of California at Berkeley 5100 B Etcheverry Hall Berkeley CA 94720-1740 USA

This paper deals with the estimation of an unknown process transfer function in the presence of colored measurement noise. A three-step estimation procedure has been previously developed for transfer functions, the delay steps and the orders of which are known in advance. The procedure is extended to deal with transfer functions with unknown delay steps and orders. The auto-correlation function of the error between the process output and model output is utilized for evaluating the model fitness. The effectiveness of the proposed method is demonstrated by a simulation study using a sample set of data in MATLAB.

关键词： colored noise I/O correlation information BCLS estimates parameter transformation MSE

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Acoustic Speech Recognition Model by Neural Net Equation with Competition and Cooperation 5

Acoustic Speech Recognition Model by Neural Net Equation wit...

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5th International Conference on Spoken Language Processing, ICSLP 1.98

作者： Kitazoe, Tetsuro Ichiki, Tomoyuki Kim, Sung-Ill Department of Computer Science and Systems Engineering Faculty of Engineering Miyazaki University 1-1. Gakuen Kibanadai Nishi. Miyazaki889-2192 Japan

The equation of neural nets for stereo vision is applied to speech recognion. We use Coupled Pattern Recognition (CPR) equation which has been shown to organize depth perception very well through competition and cooperation. We construct Gaussian probability density function(pdf) for each phoneme from a number of training data. The input data to be recognized are compared to the pdf's and the similarity measures are obtained for each phoneme. The CPR equation develops neuron activities by receiving the similarity measures as input. A recognition is achieved when the activities arrive at a stable states. The recognition rates for 25 Japanese phoneme are 74.75 % in average which is compared to 71.53 °6. by Hidden Markov Model. A certain technical improvement is applied to our neuron model, by dividing data of a phoneme into two part, one for the former frames, the other for the latter frames. A remarkable improvement is obtained with average recognition rate of 79.79 %. © 1.98. 5th International Conference on Spoken Language Processing, ICSLP 1.98. All rights reserved.

关键词： Neural networks

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Clinical evaluation of an automatic blood pressure controller during cardiac surgery

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JOURNAL OF CLINICAL MONITORING 1997年第4期13卷 261-268页

作者： Meijers, RHAM Schmartz, D Cantraine, FRL Barvais, L dHollander, AA Blom, JA 1. Department of Computer Science Faculty of Medicine Free University of Brussels (ULB) Belgium 2. Department of Medical Electrical Engineering Eindhoven University of Technology The Netherlands 3. Department of Anesthesiology Erasme University Hospital Brussels Belgium

Objective. During surgery, computers can be of great use to support the anesthesiologist in providing task automation. In this paper we describe a closed loop blood pressure controller and show the results of its clinical evaluation. Methods. The controller is based on a simple and robust Proportional-Integral controller and a supervising, rule based, expert {1.. Adaptive control is necessary because the sensitivity of the patients to sodium nitroprusside varies over a wide range. Thirty-three clinical tests during cardiac surgery, including the cardiopulmonary bypass phase, were performed. Results, On average the controller was in automatic mode for 90.6 +/- 9.6% of the time. The performance during automatic control showed the mean arterial pressure to be within 1. mmHg of che setpoint for 71.4 +/- 1..5% of the time. The average absolute distance to the setpoint was 8.1.+/- 7.2 :mmHg. Conclusions, The overall performance of the controller was noted as very satisfactory by the anesthesiologists.

关键词： computer controlled infusion closed loop control nitroprusside MAP anesthesia cardiac surgery clinical evaluation

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Adaptive Speed Control Using an RBF Network for a Servo Motor in the Presence of Angle Dependent Disturbances

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IFAC Proceedings Volumes 1997年第11期30卷 59-64页

作者： Zi-jiang Yang Koichi Hirata Teruo Tsuji Faculty of Computer Engineering and System Science Kyushu Institute of Technology Iizuka Fukuoka 820 Japan TEL: +81-948-29-7672 FAX: +81-948-29-7651 Department of Electrical Engineering Kyushu Institute of Technology 1-1 Sensui-cho Tobataku Kitakyushu 804 Japan

It is well-known that the angle dependent disturbances in a servo motor caused by nonuniformity of field windings, armature cogging, rotor imbalance, nonuniform load etc., may influence the speed control performance greatly. This often leads to large speed fluctuations which are undesired in practical situations. Therefore speed fluctuation reduction techniques in the presence of angle dependent disturbances are strongly required and have been being challenged by a lot of researchers. In this paper, the authors propose a new approach to this problem via adaptive control with the aid of a radial basis function (RBF) network composed of gaussian basis functions. The angle dependent disturbances which are viewed as a periodic nonlinear function with a period of 2π[rad] in the angle-domain, is approximated by a RBF network in the domain of [0, 2π)[rad]. Then an adaptive linearization control system employing the RBF network which compensates the disturbances is proposed. The RBF network has the advantage that it is linear-in-parameter and hence the parameter adaption is very fast and easy to implement. It is proved through theoretical analysis that the stability of the adaptive control is guaranteed by the Lyapunov stability theory. Finally, simulational and experimental results are included in the paper to show the excellent performance of the proposed method.

关键词： Servo motor speed control angle dependent disturbance RBF network adaptive control stability

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Digital Adaptive Motion Control for a Servo Mechanism

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IFAC Proceedings Volumes 1997年第11期30卷 323-328页

作者： T. Suehiro F. Ohkawa T. Hokamura S. Sagara Electronics Division Mechanics & Electronics Research Institute Fukuoka Industrial Technology Center 3-6-1 Norimatsu. Yahatanishi-ku Kitakyushu-shi 807 Japan Department of Control Engineering and Science Faculty of Computer & System Engineering Kyushu Institute of Technology lizuka 820 Japan Department of Control Engineering Faculty of Engineering Kyushu Institute of Technology Tobata Kitakyushu 804 Japan

This paper is concerned with an application of a digital adaptive control system to a servo mechanism. Mechanical systems in general include nonlinearities and additional uncertainties and which result from inertia and friction. So it is difficult to ensure robust performance and high accuracy for motion control. The digital adaptive control system presented here is considered to overcome the above stated problem. Experimental results from a feed drive system demonstrate the effectiveness of the proposed control scheme.

关键词： Adaptive Control Servomechanism Nonlinearity Uncertainty Friction

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Overview, current trends and latest results in estimating the effects of load modelling on power-system damping and stability

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EUROPEAN TRANSACTIONS ON ELECTRICAL POWER 1997年第2期7卷 107-113页

作者： Milanovic, JV [?]Jovica V. Milanovic (1967) received the Dipl.-Ing. (Elec.) and M.Sc. (Elec. Eng.) degrees from the University of Belgrade. Yugoslavia. in 1987 and I99 I respectively. One year he worked with “Energoproject-MDD”- Engineering and Contracting Co. in Belgrade as an engineer in designing power plants and substations. In late 1988 hejoined the Faculty of Electrical Engineering of the University of Belgrade first as an associate teaching assistant and then (since late 199 I) as teaching assistant at the Dept. of Power Converters and Drives. Between March 1993 and January 1996 he completed his Ph.D. at the University of Newcastle. Australia. at the Dept. of Electrical and Computer Engineering. Since February 1996 he is lecturer at the Department of Electrical Engineering and Computer Science at the University of Tasmania Austnlia. His major interests include synchronous machines and power system transients control and stability. (The University of Tasmania. Dept. of Electrical Engineering and Computer Science GPO Box 252-65 Hobart Tas 7001 Australia.Te1+61 362/262-753 Fax+61 369/262 136. e-mail: Jovica.Milanovic@eecs.utas.edu.au)

The paper presents the overview of load modelling for power-system damping and stability studies with main conclusions summarized from previous research. The attempt has been made to present a cross-section of the most exploited existing load models together with the most important conclusions drawn from their implementation in power-system stability programs. The current trends and latest results in the domain of damping of electromechanical oscillations in power systems are also presented. The effects of load dynamics on damping of electromechanical oscillations were analyzed on the basis of one of generic load models proposed in the past. The recent results further encourage investigation in this area and highlights the importance of proper load modelling.

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STRESS INTENSITY FACTORS FOR V-NOTCHED STRIP UNDER TENSION OR INPLANE BENDING

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INTERNATIONAL JOURNAL OF FRACTURE 1995年第1期70卷 81-97页

作者： CHEN, DH 1. Faculty of Computer Science and System Engineering Kyushu Institute of Technology 680-4 Kawazu 820 Iizuka Japan

The singular stress field around a sharp notch tip is expressed as a sum of two independent fields: a symmetric field with a stress singularity 1.tau(1.lambda 1. and a skew-symmetric field with a stress singularity 1.tau(1.lambda 2). The intensities of the symmetric and skew-symmetric singular stress fields are defined in terms of constants K-I and K-II, respectively. In this study, a plane problem of a strip with single or double edge notches under tension or in-plane bending is considered. The bisector of the notch may be inclined to the edge, so that the two singular stress fields with different singularities may be created simultaneously at the notch tip. The body force method is used to calculate the stress intensity factors K-I and K-II. In numerical analysis, basic density functions of the body forces are introduced to characterize the stress singularity at the notch tip. The advantages of this technique are the high accuracy of results, due to the smoothness of the unknown weight functions, and the presence of the direct relation between the values of K-I and K-II and the values of unknown weight functions. The stress intensity factors are systematically calculated for the various geometrical conditions.

关键词： Fracture mechanics

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Multiagent fault‐diagnosis expert system in power systems

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European Transactions on Electrical Power 1995年第5期5卷 341-347页

作者： Wang, J.P. Trécat, J. Dr. Jianping Wang is a doctor fellow in the Faculte Polytechnique de Mons in Belgium. His current research field is parallel processing applications in power systems. Dr. Wang obtained his BS degree from Southwest Jiaotong University in P.R. Chinain 1982. From 1982 to 1990 he was appointed as an assistant lecturer. lecturer and associate professor respectively in the electrical engineering department of Southwest Jiaotong University. He obtained his Ph.D in the FacultC Polytechnique de Mons in July of 1993. (BD Dolez 3 1 FPMS B-7000 Mons Belgium T +32-65/37 41 87 Fax +32-65/37 43 00) Professor J. Trécat is a director in the power system laboratory in the Faculty Polytechnique de Mons. He obtained his Ph.D in the University of Manchester Institute of Science and Technology(UM1ST) in U.K. in 1970. He has been working in the fields of power system automation artificial intelligence application and computer vision in the Facult6 Polytechnique de Mons since 1970. He is a senior member of IEEE and he has made much contribution both in electrical engineering education and research. (BD Dolez 3 I FPMS B-7000 Mons T +32-651374185. Fax +32-6513743 00)

In order to solve the speed problem and shallow reasoning problem met in current research in fault diagnosis expert system, this paper presents a model based parallel fault diagnosis expert system for energy management systems (EMS). The Petri net model, which corresponds to the relationship between power system components and their protection systems, has been used for the inference in fault diagnosis. A multiagent parallel processing expert system, which is based on five transputers in Sun workstation, has been built for fault diagnosis purposes. The test results show that this expert system is not only fast but also has better performances. Copyright © 1.95 John Wiley & Sons, Ltd.

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AUTOMATED VERIFICATION OF RESPONSIVE PROTOCOLS MODELED BY EXTENDED FINITE-STATE MACHINES

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REAL-TIME systemS 1994年第3期7卷 275-289页

作者： KAKUDA, Y KIKUNO, T KAWASHIMA, K 1. Department of Information and Computer Sciences Faculty of Engineering Science Osaka University 560 Toyonakashi Osaka Japan

Along with advancement of communication systems, the demand for fault-tolerance and real-time performance for communication protocols continues to increase. Communication protocols which perform recovery from any abnormal state to a normal state are called self-stabilizing protocols. However, in these protocols, real-time recovery is not taken into consideration. This paper discusses verification of communication protocols which have self-stabilizing and timeliness properties, which are called responsive protocols. Gouda et al. proposed a mathematical method to prove whether a given protocol specification satisfies the self-stabilizing property. However, this method is not automated and does not verify the timeliness property. This paper thus proposes an automated method for verification of responsive protocols. In this method, communication protocols are modeled by extended finite state machines and their states are represented by predicates. The self-stabilizing property is proven by verifying that sequences of such states which start from an arbitrary abnormal state converge in a normal state. Also, the timeliness property is proven by verifying that the convergence is done within a priori given time.

关键词： Network protocols

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