Crack location identification of rotating rotor systems using operating deflection shape data  

作　　者：ZHANG ChunLin LI Bing YANG ZhiBo XIAO WenRong HE ZhengJia 

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

出　　处：《Science China(Technological Sciences)》2013年第7期1723-1732,共10页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 51035007);the National Basic Research Program of China ("973" Program) (Grant No. 2011CB706805);Program for Changjiang Scholars and Innovative Research Team in University

摘　　要：Crack location identification, as one key destination of structural health monitoring, is still a challenge for operating rotor systems. The operating deflection shape (ODS), which represents a visual description of the structural vibration patterns under operating conditions, has been gaining importance for structure damage detection in recent years. The ODS carries damage information of a structure, however, it is also difficult to detect weak cracks of rotor directly. The approximate waveform capacity dimension (AWCD) method was successfully applied to damage detection of plates and beam-like structures. In this paper,a strategic approach that combines ODS and weighted AWCD is proposed for crack location identification of the rotating rotor.To eliminate the false peaks of AWCD and obtain desirable results, a weight factor and ODS curvature data are introduced to the expression of the weighted AWCD. The effectiveness of the proposed method is validated by numerical simulation and experimental investigation in a cracked rotor system. The results indicate that the proposed approach not only provides good identifying performance for incipient rotor cracks, but also effectively eliminates the fault peaks introduced by the inflexion locations of ODSs. Moreover, the proposed approach proves promising in detecting crack locations of rotating rotor systems.Crack location identification, as one key destination of structural health monitoring, is still a challenge for operating rotor systems. The operating deflection shape (ODS), which represents a visual description of the structural vibration patterns under operating conditions, has been gaining importance for structure damage detection in recent years. The ODS carries damage information of a structure, however, it is also difficult to detect weak cracks of rotor directly. The approximate waveform capacity dimension (AWCD) method was successfully applied to damage detection of plates and beam-like structures. In this paper,a strategic approach that combines ODS and weighted AWCD is proposed for crack location identification of the rotating rotor.To eliminate the false peaks of AWCD and obtain desirable results, a weight factor and ODS curvature data are introduced to the expression of the weighted AWCD. The effectiveness of the proposed method is validated by numerical simulation and experimental investigation in a cracked rotor system. The results indicate that the proposed approach not only provides good identifying performance for incipient rotor cracks, but also effectively eliminates the fault peaks introduced by the inflexion locations of ODSs. Moreover, the proposed approach proves promising in detecting crack locations of rotating rotor systems.

关 键 词：cracked rotor CRACK LOCATION IDENTIFICATION operating DEFLECTION SHAPE (ODS) WEIGHTED approximate waveform capac-ity dimension (weighted AWCD) 

分 类 号：TG115.28[金属学及工艺—物理冶金]