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基于时频信息提取的两自由度时变模态参数识别方法

Release Time:2019-03-11  Hits:

Indexed by: Journal Article

Date of Publication: 2007-12-15

Journal: 河南科学

Included Journals: ISTIC

Volume: 25

Issue: 6

Page Number: 896-899

ISSN: 1004-3918

Key Words: 模态参数;时频重排;小波变换;脊线

Abstract: 通过对非线性结构响应的Gabor小波谱进行重排,从中提取出反映系统频率的时频脊线,由脊线得到非线性结构的瞬时频率和幅值,进而识别出结构响应信号的骨架曲线.对1个两自由度结构的算例分析表明:通过重排谱和脊线能较理想地识别出系统的时变频率和骨架曲线,脊线的方法比常规的优化方法简便.

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