The solution of the weak nonlinear system is expanded by Fourier series,and then the resonance solution of strongly nonlinear system can be found by undetermined parameter methed.

The research of rolling bearing fault diagnosis based on resonance-demodulation with software;

The Software System for the Rolling bearing Fault Diagnosis Based on Resonance-demodulation;

Wavelet analysis and resonance demodulation for diagnosing the mechanical fault;

The on-line detecting damage of the train bearing with acoustics resonance demodulation technology;

On the condition that the circumstance is bad and interfered strongly underground,it is the most effective and probable for acceleration transducer to diagnose the problem of rolling bearings of transporting machinery with the technology of high frequency resonance demodulation.

The principles of the wavelet analysis and resonance cleavage and their application in the machinery fault detection are introduced.

A method using demodulated resonance technique based on blind source separation is developed for gear contact diagnosis.

Discrete time Fourier transform(DTFT) is applied to the spectrum analysis of the demodulated signal in demodulated resonance technique.

： Discussed in this paper is the essentiality and demand content of the bearings＇ check during the traction motor＇s empty－carry test． Especially discussed is how to test motor bearings by demodulated resonance technique and temperature－rise measure

The characteristic of demodulated resonance technique used in condition monitoring of rolling bearing was reviewed.