The present invention relates to an apparatus and method for detecting a failure of a cepstrum-based planetary gearbox, smoothing a spectrum in a frequency domain through cepstrum analysis from a signal obtained from a planetary gearbox, and based on this, the boundary of bandpass filters By determining the values, band-pass filters can be configured, and the signal obtained from the planetary gearbox is analyzed through the configured band-pass filters, and the signal related to the failure can be extracted and quantified by demodulation after decomposition. .
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