Experimental Evaluation and Statistical Analysis of Synchronous Averaging

摘要: Time synchronous averaging for the extraction of periodic waveforms is a rather common processing method rotating machinery diagnosis. By synchronizing signal to rotational angle component interest (e.g. by using tachometer reference signal), it possible perform in angular domain, thus obtaining an angle-synchronous signal. Such operation usually requires resampling procedure. In this paper, operations time and domain are thoroughly discussed, referring main measurement computational errors affecting extracted waveform. The effects uncertainty pulse arrival times on studied. Jittering affects quality process resulting attenuation components, especially high frequency band. A theoretical analysis linkage between jitter model performed analytical proposed. agreement with numerical simulations first shown, then experimental case study involving early detection bearing damage examined. results discussed framework cyclostationary theory.