Time - field analysis , frequency - field analysis and correlation function analysis in traditional , have been improved in application of fault diagnosis . and gray system , obscure subjection degree , expert system , wavelet analysis and neural network , etc . have been applied in running state of qualitative analysis system , however , it is the issue having been concerned all along in academic circle that the fault state of system is analyzed quantitatively 傳統(tǒng)的時(shí)域分析、頻域分析和相關(guān)函數(shù)分析在故障診斷應(yīng)用中得到了不斷的改進(jìn),灰色關(guān)聯(lián)度、模糊隸屬度、專家系統(tǒng)、小波分析及神經(jīng)網(wǎng)絡(luò)等方法在定性分析系統(tǒng)的運(yùn)動(dòng)狀態(tài)中得到廣泛的應(yīng)用,而定量地分析系統(tǒng)的故障狀態(tài)是學(xué)術(shù)界一直關(guān)注的問(wèn)題。