Proposal of encoder-less time synchronous averaging method utilizing nonlinear oscillator for gears in operation

Abstract

This study proposes a rotary encoder-less time synchronous average using a non-linear filter for vibration analysis of gears in operation. This non-linear filter has smaller phase lag than that of conventional linear filters and a property synchronized with the meshing vibration. Therefore, the proposed method can estimate accurate rotational phase of gears. The accurate estimation of rotational phase of gears enable us to average the vibration responses including meshing frequency without any speed sensors and eliminate noises incoherent with the revolution periods of the gears of interest. In this paper, we explicate the ability and utility of this method are experimentally verified by using an ideal gear vibration model and an actual gear vibration response. As a result, the non-linear oscillator has an advantage compared with the linear filter for the highlighting the meshing frequency in the gear vibration, because of its demodulation property.

Keywords

• gear meshing vibration
• time synchronous averaging
• nonlinear oscillator
• synchronization