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Recent Developments in Motion and Vibration Control

The importance of Motion and Vibration Control (MOVIC) technology has been increasing in various fields to achieve high accuracy, high speed, high efficiency, high quality and high reliability. This talk will present two topics of our recent developments. First, a new vibration isolation system using zero-power magnetic suspension is presented. Since a zero-power suspension system behaves as if it has a negative stiffness, infinite stiffness against disturbances on the isolation table can be achieved by combining it with a normal spring. It enables the system to have good characteristics both in reducing vibration transmitted from ground and in suppressing direct vibration. In addition, the control method of realizing negative stiffness is generalized to be applicable to various kinds of linear actuators. Second, a servocompensator with performance of automatic frequency following is presented. In this compensator, control input is calculated based on convolution integral instead of state-space equation. In calculating the convolution, exogenous signals synchronized with the disturbance/reference signals are used as a weighting function. As a result, this compensator can achieve perfect output regulation in systems subjected to sinusoidal disturbance/ reference signals without any complicated adaptive algorithms. Its efficacy is shown in several practical control systems.

Type of Seminar:
Public Seminar
Prof. Takeshi Mizuno
Department of Mechanical Engineering Saitama University Shimo-Okubo 255, Saitama 338-8570, JAPAN
Jun 06, 2002   17:15

ETH Zentrum, Gloriastrasse 35, Building ETZ, Room E6
Contact Person:

Prof. M. Morari
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Biographical Sketch:
Professor Mizuno received his Master of Engineering in Mathematical Engineering and Instrumentation Physics from the University of Tokyo in 1980. The same year he received the title of Doctor of Engineering in Precision Engineering and worked as Research Associate at the Institute of Industrial Science at the University of Tokyo. In 1985 he moved to Polytech University. After being Assistant Professor for three years, in 1988 he received the position of Associate Professor at Saitama University. In 1990-1991 he was Guest Professor at the Institute of Robotics, ETH Zurich. By the year 2000 he is Professor of Mechanical Engineering at Saitama University. He is also the General Chairperson of MOVIC 2002 Awards: Takagi Award from Precision Measurement Technique Promoting Foundation (1995), The Japan Hydraulics & Pneumatics Society Prize for Best Paper (1996), Award for Excellent Research Paper from Foundation for Promotion of Advanced Automation Technology (1997), Awards for Outstanding Paper from Society of Instrument and Control Engineers (1998), Dynamics, Measurement and Control Division Awards for Pioneering Achievement from the Japan Society of Mechanical Engineers (1999).