Abstract
An internal active vibration control system for suppressing gearbox housing vibrations dueto gear transmission error excitation is developed and evaluated experimentally. Theapproach is based on an active shaft transverse vibration control concept that resideswithin the gearbox. The system contains a piezoelectric stack actuator for applyingcontrol forces to the shaft via a secondary rolling element bearing. An enhancedfiltered-x least mean squares control algorithm with frequency estimation capability is employed togenerate the appropriate actuation signal. The experimental results show up to about 20 dBreduction in the vibration levels of the first two mesh harmonics at the control positions onthe housing structure for a range of operating speeds. The experimental studiesalso indicate that, under certain narrow operating conditions, the vibrations atsome non-control positions may be amplified slightly due possibly to the effect ofunmodeled dynamics. In spite of this limitation, the proposed active vibration controlapproach is quite promising for reducing gear vibration and ultimately gear noise.
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