基于模态参数的轻质高强机翼梁结构损伤识别研究

Modal Parameters Based Damage Identification of Light-Weight High-Strength Wing Beam Structure

提出了一种适用于轻质高强梁结构的损伤识别方法。针对附加质量的频率灵敏度方法在轻质高强梁结构损伤检测中出现的定位干扰问题,将结构的模态振型与应变能相结合,提出一种可利用结构应变能排除损伤定位干扰的损伤识别方法,并分别进行了数值仿真和实验验证。结果表明,该方法兼具了附加质量频率灵敏度法和应变能法在损伤识别中的优点,可以较为精准地识别轻质高强梁结构中的损伤位置和损伤程度。

A damage identification method is proposed, which is suitable for light-weight, high-strength beam structure. Aiming at the problem of positioning interference in the frequency sensitivity method of additional mass for use in the light-weight, high-strength structural damage detection, we combined the modal vibration of the structure with the strain energy, and proposed a damage identification method, which could eliminate the damage location disturbance by using the structural strain energy. Numerical simulation and experimental verification were carried out respectively. The results show that the method has the advantages of both the frequency sensitivity method and the strain energy method in damage identification, and the damage location and damage degree can be identified more precisely.