摘要
将结构振动测试技术与小波包分析相结合,提出对振动激励信号与响应信号分别进行小波包分解并在此基础上计算结构的小波包脉冲响应函数及其小波包能量谱,用以表征结构动力系统的损伤状态.通过一钢筋混凝土板静力承载力的振动试验分析,计算该板在不同受力阶段的小波包脉冲响应函数及其小波包能量谱,在此基础上对板不同受力阶段的损伤状态进行了判别.该方法克服了结构动力响应的小波包能量谱不能反映结构损伤状态的缺点,试验表明所采用的方法是可行的.
The wavelet packet impulse response function and the wavelet packet energy spectrum of the structural dynamic system are proposed to identify the structural damage status, which is obtained by the wavelet packet decomposition of vibration exciting signals and response signals. Through an analysis of a reinforced concrete slab subjected to a series of static loading, the damage status of the slab during different loading phases is determined using the wavelet packet impulse response functions and the wavelet packet energy spectrum. The proposed method overcomes the shortcoming that the wavelet packet energy spectrum calculated directly from the structural dynamic response does not reflect the structural damage status and the experiment results have confirmed the feasibility of the method.
出处
《力学学报》
EI
CSCD
北大核心
2006年第5期639-644,共6页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金(50378017)
国家自然科学基金重点项目(50538020)资助.~~
关键词
损伤预警
振动测试
小波分析
小波包分析
小波包能量谱
damage alarming, vibration testing, wavelet analysis, wavelet packet analysis, wavelet packet energy spectrum