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  A new method combining Empirical Mode Decomposition(EMD) with time-frequency ridge is proposed to estimate the Instantaneous Frequency (IF).In this paper,the EMD method was used to decompose the vibration signal,then the time-frequency spectrum of each Intrinsic Mode Function(IMF) derived based on the EMD was reassigned with the technology of time-frequency reassignment to improve its time-frequency sharpness. Consequently,the ridge of time-frequency reassignment was extracted to obtain the IF estimation.Thus, the shortcoming of noise sensitivity of Hilbert Transform was overcome.The comparison analysis shows that with the ridge extraction of time-frequency reassignment,a precise IF estimation can be gained to realize the order tracking of the run-up signals and the fault diagnosis of hoist gearbox.……   
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