Revised computed order tracking method for element rolling bearing diagnosis

Computed order tracking is a kind of algorithm which is generally used to eliminate the effect of varying rotational speed on the rotary machines. However, it is impropriate to use the computed order tracking algorithm and its corresponding analysis techniques on the fault diagnosis of the rolling element bearing unless the peak time of the fault induced impulse is set as zero which cannot be met in the real engineering. In this way, the resampling process which is realized by padding different amount of data into the segments with different rotational speed will cause change of intervals between the adjacent impulse peaks in the angle domain and then affect the final diagnosis by envelope analysis. In this paper, a quantitative analysis is firstly carried on to detect the mechanism of this phenomenon and find key influence factors. And then a change in envelope interval based compensation algorithm is put forward to eliminate this kind of effect.

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