关键词: 修正的Morlet小波, 自适应, 模态分析, 参数识别

Abstract:

A novel adaptive modal parameter identification method based on modified Morlet continuous wavelet transform(MCWT) was proposed to improve the modal parameter identification precision. In MCWT,a modified operator was applied to adjust the band wide of the mother wavelet to improve the resolution in frequency domain. The proposed principle of maximum-energy (PME),and the principle of maximum-distance(PMD)/minimum-relativity (PMR) of continuous wavelet decomposition of the close scales were adopted to ascertain optimal decomposed scale of wavelet.Simultaneously, different anti-repeat operators were applied into target function to eliminate the coupling of the decomposed signals at the most extends.A simulation and an experiment were carried out on a simple supported beam,the results validate the proposed method.

Key words: modified Morlet wavelet, adaptive, modal analysis, parameter identification