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We intend to exploit the vibration status such as the resonance existed in a faulty bearing-rotor system on signal acquisition for diagnosis in this paper. We establish a symmetrical bearing-rotor-pedestal system to do the dynamic response analysis. The theoretical analysis indicates the resonances excited by the excitations can enhance the response in low-frequency range as well as the response in high-frequency range because the pulse energy produced by bearing defect increases under this situation. Finally, these conclusions are verified qualitatively by the experiment. Keywords—bearing local defect; ball bearing-rotor system; resonances; envelope analysis

The Rotor Speed Choice of Signal Acquisition in a Ball Bearing-rotor System with a Raceway Local Defect Based on Dynamic Analysis