Design of an Adaptive Controller for Chatter Suppression in the Turning of Slender Workpieces

• Main Authors: Ching-Hung Ho, 何慶鴻
• Other Authors: Jiann-Lih Hwang
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/07226171681487849580

碩士 === 逢甲大學 === 自動控制工程所 === 97 === In this paper, we design a piezo-actuated tool holder to replace the conventional tool holder for chatter suppression in the turning of slender workpieces. In designing the controllers, it is noted that the transfer function from the cutting force to the displacement of workpiece is difficult to be identified accurately and is time-varying in the turning process. Therefore, adaptive type controllers are adopted in this study. It is proved by theory that the controller designed by using an adaptive notch filter has the ability of improving the stability of the cutting dynamics. A controller is also designed by using the feedback filtered-x least mean square (feedback FXLMS) algorithm. The effects of measurement uncertainties on the chatter suppression performance of the controller are then investigated. The derived theoretical results are verified through computer simulations. A table lathe was retrofitted for carrying out the turning experiments using the piezo-actuated tool holder. Under the same cutting conditions, the experimental results are compared for conventional tool holder, uncontrolled piezo-actuated tool holder and the FXLMS controlled piezo-actuated tool holder. The experimental results have indicated that the proposed controller can suppress chatter effectively.