Steam turbine rotor crack detection using sifting process of EMD and B-spline wavelet on the interval element model  

作　　者：Chen Xuefeng Yang Zhibo Li Bing Zi Yanyang He Zhengjia 

机构地区：[1]School of Mechanical Engineering,Xi'an Jiaotong University [2]The State Key Laboratory for Manufacturing Systems Engineering,Xi'an Jiaotong University

出　　处：《Engineering Sciences》2013年第1期10-14,22,共6页中国工程科学（英文版）

基　　金：National Natural Science Foundation of China(No.51225501;No.51035007);Program for Changjiang Scholars and Innovative Research Team in University

摘　　要：A high-precision identification method for steam turbine rotor crack is presented. By providing me nrst three measured natural frequencies, contours for the specified natural frequency are plotted in the same coordi- nate, and the intersection of the three curves predicts the crack location and size. The cracked rotor system is mod- eled using B-spline wavelet on the interval （BSWI） finite element method, and a method based on empirical mode decomposition （EMD） and Laplace wavelet is implemented to improve the identification precision of the first three measured natural frequencies. Compared with the classical nondestructive testing, the presented method shows its effectiveness and reliability. It is feasible to apply this method to the online health monitoring for rotor structure.

关 键 词：steam turbine rotor crack detection EMD wavelet finite element method 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TP212[自动化与计算机技术—计算机科学与技术]