基于振动测试与小波包分析的结构损伤预警

STRUCTURAL DAMAGE EARLY WARNING BASED ON VIBRATION TESTING AND WAVELET PACKET ANALYSIS

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.