Active Vibration Control of Gear Transmission System

In this paper, an active control structure used piezoelectric stack actuator is built to suppress vibration due to internal incentive in gear transmission. Because the gear system is timevariant and unknown, an offline modeling technique is unable to tracking the changes in the secondary path, an adaptive filter algorithm used online secondary path modeling method is proposed to the active vibration control. In order to realize the algorithm, a C-MEX S function is used to build an FxLMS (Filtered-x least mean square) algorithm block in Simulink. Besides, reference signal estimation and secondary path modeling are critical components for the proposed control system. Therefore, an adaptive cascaded notch filter technology is used to extract the reference signal from the gear vibration. An adaptive LMS filter is also used to identify the secondary path by online experiment, effective secondary path transfer function is obtained at the same time avoid mutual interference between the secondary path identification and controller. Finally, the custom FxLMS block is downloaded to dSPACE as controller and a series of experimental studies are carried out. Experiment results show that the performance of the proposed piezoelectric stack actuator controlled by FxLMS to suppress the vibration is obvious, about 13dB-21dB of gearbox vibration is attenuated at different fundamental gear mesh frequency.