Abstract
This paper applies an intelligent control scheme to investigate a diaphragm-type pneumatic vibration isolation (PVI) problem. Adaptive wavelet neural network (AWNN) control is employed to control the PVI system which has inherited nonlinear and time-varying system characteristics. Since AWNN has excellent approximation capability originating from wavelet decomposition property and online learning ability stemming from neural networks, the method is especially suitable for the PVI control applications. In this paper, the adaptive learning rates are derived based on the Lyapunov stability theorem. Therefore, the stability of the closed-loop system can be assured. To validate the proposed method, a composite control scheme using pressure and velocity measurements as feedback signals is implemented. During experimental investigations, sinusoidal excitation with the excitation frequency close to the resonance and random-like signal are input on a floor base to simulate ground vibrations. Performances obtained from the proposed control scheme are compared with those obtained from passive isolation and PID scheme to illustrate the effectiveness of the proposed intelligent control.
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Recommended by Associate Editor Hongbo Li under the direction of Editor Fuchun Sun. The authors would like to acknowledge the financial support of the National Science Council of TAIWAN through its grant NSC-101-2221-E-131-008.
Hung-Yi Chen received the M.S. degree from Auburn University, AL., U.S.A. and the Ph.D. degree from National Taiwan University of Science and Technology, Taiwan, in 1991 and 2006, respectively, all in mechanical engineering. Since 1997, he has been with Ming Chi University of Technology, where he is currently an associate professor. His research interests include intelligent control applications, mechatronics, automation and vehicle suspension control.
Jin-Wei Liang received the B.Sc. and M.Sc. degrees from National Taiwan University of Science and Technology, Taiwan, in 1985 and 1988, respectively. He got his Ph.D. degree from Michigan State University, U.S.A., in 1996. All his majors are in mechanical engineering. In 1985, he joined the faculty of the Department of Mechanical Engineering, Ming Chi University of Technology, Taiwan. He is currently a professor at the Mech. Eng. Dept. His research interests include nonlinear dynamics, vibration and control.
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Chen, HY., Liang, JW. Adaptive wavelet neural network controller for active suppression control of a diaphragm-type pneumatic vibration isolator. Int. J. Control Autom. Syst. 15, 1456–1465 (2017). https://doi.org/10.1007/s12555-014-0428-2
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DOI: https://doi.org/10.1007/s12555-014-0428-2