基于子结构的隐蔽损伤识别方法研究

Research on identification method of concealed damage using substructure

针对隐蔽结构损伤识别存在精度和效率较低的问题,探索性地应用子结构法对结构的隐蔽损伤进行研究,建立了基于子结构的隐蔽损伤识别方法.该方法在采集可测部位结构的振动信号的基础上,利用扩展卡尔曼滤波技术对隐蔽结构的时变参数进行识别,进而判定隐蔽结构的损伤位置和损伤程度.该识别方法首先建立识别计算模型,划分子结构;其次应用扩展卡尔曼滤波构建隐蔽结构损伤识别的识别方程;最后应用识别方程对隐蔽结构的损伤进行识别.该方法为难以直接测量的特种部位损伤识别提供了理论基础,并为隐蔽结构的损伤识别提供了新的途径.

In order to solve the problem of the accuracy and efficiency of the concealed structure damage identification,the substructure method is used to study the concealed damage of the structure.Based on the method,the vibration signal can be measured in the acquisition part of the structure;the time-varying parameters of the structure are identified by using the extended Kalman filtering;and then the location and degree of damage of the concealed structure are determined.Based on the theory of damage identification,the feasibility of the method is verified by a case study.The identification method firstly establishes the recognition calculation model and divides the substructure.Secondly,the extended Calman filter is applied to construct the recognition equation of concealed structure damage identification.Finally,the damage identification of concealed structure is identified by using the recognition equation.This method provides a theoretical basis for the damage identification of special parts which are difficult to measure directly by human;and the method provides a new way for damage identification of concealed structures.