局域波法, 支持向量机, 故障诊断, 趋势预测, 往复机械

According to the real working status of running reciprocating machines,a grey prediction method of diagnosis based on local wave time-frequency spectrum and SVM was presented. By local wave time-frequency spectrum, power fluctuate of the vibration signals could be reflected on time and frequency domain. Comparing the precision of the two main analysis models in diagnosis prediction on industrial equipment, a step-changing grey prediction model was chosen, in which the local wave decomposition was set as the basic input. Application of the method in fault prediction on a reciprocating compressor system illustrates the precision improvement.

local wave method, support vector machine(SVM), fault diagnosis, trend prediction, reciprocating machinery