Frequency Response Functions Model
Wei Ruixuan1,Han Chongzhao1,Zuo Dongguang1,Zhang Zonglin2,Hao Tao2
(1.School of Electronics and Information Engineering,Xi'an Jiaotong Univercity 710049,China;
2.College of Engineering,Air Force Engineering University)
Abstract:To avoid estmating current generalized frequency response functions (GFRF) of the analyzed system in the fault diagnosis based on nonlinear spectral analysis, a new diagnosis method based on the multiple preset GFRF model is presented. In this method, various preset GFRF models are used to describe the corresponding working mode of the system. And the matching extent of each preset model and the current state of the system can diagnose the faults. This method has been used to diagnose the fault of a actual vehicle damping spring. Test results indicate that this presented method is efficient for engineering application. Furthermore, this method can avoid estimating the current GFRF of the system. Its online computation requirement is small, and its realization by using microprocessors is convenient.
Keywords:generalized frequency response functions(GFRF);multiple preset model;fault diagnosis