Active control of a diaphragm-type pneumatic vibration isolator

• Main Authors: Wu Kunwei, 吳崑瑋
• Other Authors: Liang Jinwei
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/25524640992776636159

碩士 === 明志科技大學 === 機電工程研究所 === 99 === Since diaphragm-type pneumatic vibration isolator has nonlinear and time-varying characteristics, it is difficult to establish an accurate dynamic model for designing a model-based controller. In this thesis, a model-free functional approximation based (FA based) adaptive sliding controller is integrated with an adaptive fuzzy-based compensator (AFSMC) and proposed to control the diaphragm-type pneumatic vibration isolator. The functional approximation technique is employed here to approximate the unknown time-varying function and release the model-based requirement of sliding-mode control. The update laws for the coefficients of the Fourier series functions are derived from the Lyapunov stability theory. To that end, the close-loop stability is also assured. The proposed FA+AFSMC control scheme is verified in the active control of the diaphragm-type pneumatic vibration isolator. Experimental results indicate that the control performance obtained from the proposed scheme are better than those obtained from traditional PID control or adaptive fuzzy sliding control.