The relationship between features of bearing failures and different positions of sensor

The relationships of failure detection ratios between sensor and bearing at different distances were investigated in order to decide the rational numbers of sensor and select appropriate sensor's places. The impulse signals from bearing failure were separated from the vibration signals of machinery failure by an envelope detector. The failure detection ratios were calculate according to the analysis for impulse signals. Experimental results have shown that using accelerometer to monitor conditions of a few bearings at different distances is possible, and the relationship of the failure detection ratios under various testing conditions have been obtained. This detection method, using an accelerometer to monitor a few bearings at different distances, has been proved to be able to satisfy the various requirements of failure diagnosis. In addition, since the method decreased the unnecessary number of sensors and other devices, it can not only decrease the coast of monitoring devices, but can also decrease the self-maintenance costs of monitoring devices. This study a new approach for bearing failure diagnosis.