Abstract-Frequency domain method including high frequency
resonance technique (envelope analysis) is one of the most
efficient methods for detecting localized defect of rolling element
bearings. But this theory has a limitation that bearings must run
at a constant rotating speed. However, in practice, with load
change or in the run-ups and run-downs processes, bearings
often work at varying rotating speed. This paper proposes a new
scheme to solve this problem, which is based on time-frequency
analysis and order analysis techniques. For realizing order
tracking without the employment of hardware such as
tachometer and keyphasor, the instantaneous frequency
estimation method is used for accessing the resampling time
serials. The feasibility of this scheme is confirmed by experiment
on bearings with outer and inner race faults.