PROPOSAL OF ROTARY ENCODER LESS TIME SYNCHRONOUS AVERAGING METHOD USING NON-LINEAR OSCILLATION FILTER FOR GEARS IN OPERATION

- COMPARISON OF FREQUENCY CHARACTERISTIC WITH LINEAR FILTER -

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 is able to 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 difference of frequency characteristic between the linear and non-linear filters, and show the availability of the new method by numerical simulations using a vibration model of meshing gear with noise. The numerical simulation result discloses the noise-reducing by the averaging method using the non-linear filter outperforming the conventional liner filter.