Research on active vibration control of thin-walled workpiece in milling based on voice coil motor

Abstract

Thin-walled workpieces are widely used in the industries of aerospace, national defense, petrochemistry and so on. Workpiece machining vibration induced by cutting tools greatly affects the milling efficiency and accuracy, and hence vibration alleviation has now become a bottleneck technique for the milling process of thin-walled workpieces. An active control method is developed here to attenuate the milling vibration by using voice coil motors and laser displacement detectors as actuators and sensors, respectively. The control algorithm is embedded in a FPGA module, and the closed-loop system is fulfilled by a FPGA card. Finally, this closed-loop control system is examined by vibration control experiments on a thin-walled aluminium alloy workpiece, where the vibration amplitudes have been decreased by 75% with cutting frequency bandwidth of 15Hz. The feasibility and superiority of the proposed active control method and the closed-loop system are thus verified. © 2013 Springer-Verlag Berlin Heidelberg.