Test System For Bearing Defects And Experimental Research

The Rolling bearings are the one of the most using mechanical parts of the rotating machinery, but also the most vulnerable parts to damage. Many faults of rotating mechanism are related to the rolling bearings. The state of the rolling bearings influences the machine greatly. Thus, for rolling bearing fault diagnosis technology research is of great practical significance.During the study of this subject, first studied the rolling bearing fault diagnosis theory and methods, then applied the principle of resonance demodulation, an analog hardware circuitry has been designd, including the design of charge amplifier, filter circult, dector circuit, peak circuit and the average circuit; Secondly, in order to use PC for machine vibration signal processing, a data acquisition device is designed based on C8051F340 which is a mixed-signal microcontroller and integrates USB controller and A/D converter on a chip; Third, the PC applications software was designed, which has the functions of real-time monitoring, spectral analysis(FFT), digital filtering, zoom -FFT, cepstrum analysis and average of the spectrum.Finally, the bearing fault diagnosis system has been used in rolling bearing virbration testing laboratories. Made a pertinent measurement, give accordance with the calculation basically. The correctness and practicality of this system has been validated.