基于Wigner-Ville时频幅值曲率的结构位置损伤识别

Damage Location Detection for Structures Based on Curvature of Wigner-Ville Time-frequency Amplitude

为探索既有明确物理意义又有良好实用性的结构损伤识别方法,利用Wigner-Ville时频分布（WVD）对结构自由振动响应进行解析,建立了WVD时频幅值与结构模态参数的函数关系,提出利用测点WVD时频幅值曲率来识别损伤。该方法物理意义明确,初始激励易于实施,且不需要模态参数识别,提高了损伤识别精度。算例分析结果表明,所提出的方法能较好地识别出结构单个或多个损伤位置,且数据易于获得,处理简便。

To explore a method of damage detection for structures with clear physical signification and good practicality,the function relation between WVD amplitude and model parameters is founded on the basis of WVD analytical expression of free vibration response,then the WVD amplitude curvature based on sensors is suggested for damage detection.The physical meaning of this method is clear and the initial motivation is easy to implement.This method also does not need to identify the modal parameters and improve the damage detection accuracy.The results of numerical analysis demonstrate that,the proposed method has good recognition results in identifying the location of single-or multi-damage of structures,and the test data is easy to obtain and process.