基于基础激励的结构损伤检测局部损伤因子法

Structural damage detection using local damage factor method based on base excitation

提出了基于振动理论的结构损伤检测局部损伤因子法.局部损伤因子法可同时判定结构损伤的存在,反映结构损伤的程度及确定结构损伤的位置.局部损伤因子法考虑了结构本身非线性的影响和检测系统噪声的影响,提高了结构损伤检测的精度.用局部损伤因子法检测结构损伤时只需要2个传感器同时工作即可,测试仪器设备较少,测试方便、经济,适合于结构损伤的现场检测.模型实验表明,在基础激励条件下局部损伤因子法对结构损伤检测是有效的.

The local damage factor （LDF） method for structural damage detection based on the vibration theory was introduced. The LDF method could be employed to simultaneously determine the presence, severity and location of potential structural damage. The influence of structural nonlinearity and system noise was considered in the LDF method. Thus, the accuracy of damage detection was improved. Structural damage detection using the LDF method needs less equipment （only two transducers）, and it is convenient, economical and suitable for the field. The experimental results show that structural damage detection using the LDF method based on base excitation is effective.