基于受控结构动力特性和信息融合的损伤识别

提出了一种使用受控结构动力特性数据和运用信息融合技术进行结构损伤识别的方法。分别采用多损伤定位确信准则和结构的频率变化平方比相关性作为损伤识别指标,用状态反馈控制的方法有目的地对结构进行极点配置,得到所需的受控结构的特征频率和特征振型,以提高损伤识别指标对损伤的敏感度,然后用证据理论的方法将两者的识别结果进行决策级融合,得到一个更为可靠的损伤识别结果。数值仿真计算结果表明,所提出的方法能有效提高结构损伤识别的准确性。

Damage Identification Based on Dynamic Characteristics of Controlled Structure and Information Fusion

The paper presents an approach of structural damage identification by using the data of dynamic characteristics of controlled structure and information fusion techniques.In the study,the multiple damage location assurance criterion(MDLAC) and the frequency change square ratio correlation(FCSRC) are taken as the damage identification indices.The state feedback control method is employed to place the poles of the structure and the prescribed characteristic frequencies and modes of the controlled structure are obtained accordingly,which might improve the sensitivity of MDLAC and FCSRR to damage of the structure.The information fusion method is finally used to combine the results of the fore-mentioned two methods to get a more reliable diagnosis.The numerical results indicate that the proposed method is effective and can identify the damage more accurately.