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This paper concerns an experimental vibration analysis on the crack that appeared early on an automobile gearbox. We conduct the testing vibration analysis and modal analysis of the gearbox when the whole auto is in a coupling state. We conduct the testing vibration analysis when the auto is in a running state, and obtained the natural frequency and vibration modal of the gearbox in a vertical direction. The influence of imbalance to vibration amplitude of the gearbox at commonly used running speed and rotating speed is measured and analyzed. The influence of a rigid absorber is discussed too. After the dynamic strength of the gearbox was measured and analyzed, we determined the weak part of the gearbox and found every kind of influence factor for the gearbox break.
We conduct the testing vibration analysis and modal analysis of the gearbox when the whole auto is in a coupling state. We conduct the testing vibration analysis when the auto is The influence of imbalance to vibration amplitude of the gearbox at commonly used running speed and rotating speed is measured and analyzed. The influence of a rigid absorber after the dynamic strength of the gearbox was measured and analyzed, we determined the weak part of the gearbox and found every kind of influence factor for the gearbox break.