Comprehensive Diagnosis of Gear-Box Typical Fault in the High Speed Wire Rolling Mills

Gearbox vibration signal of high-speed wire rolling mills is complex and has much complex frequency structure and various disturb. It leads to the difficulty of diagnosis work especially some or other early impulse fault hidden in existence. The paper presents a new comprehensive analysis method which integrates the statistical analysis, the frequency analysis and the time-frequency analysis organically. First, time domain wave analysis, frequency analysis, statistical trend analysis and characteristic frequency amplitude trend analysis are used to judge the status of the machine and fault parts primarily, and then precision diagnosis of wavelet packets decomposition and reconstruction based on the multi-resolution analysis is used to make certain the fault quality and fault position quantitatively. The diagnosis analysis results of one application example indicate the validity and the practicability of the method proposed here