压电智能结构的损伤识别研究

Research on Damage Identification of Piezoelectric Smart Structures

采用有限元方法分析了裂纹宽度对压电智能结构阻抗信号的影响,得出了压电智能结构的导纳频谱图。结果表明:随着裂纹宽度的增加,电导的共振频率产生了向左的偏移,损伤程度越大,共振频率偏移越多,且出现了较多的次模态,共振峰值也随损伤的增大而减小。此外引入的损伤指标RMSD的值会随着裂纹宽度的增加而增大。此结论对于结构的损伤识别具有一定的参考价值。

The effect of crack width on the impedance of piezoelectric smart structures was analyzed by using the finite method. The electric admittance spectrum of piezoelectric smart structures was obtained. The conclusion shows that with the increase of the crack width,the resonance frequency of the conductance is shifted to the left,and the larger the damage,the more the deviation. When the crack is increased,the secondary mode is generated. The resonance peak value also decreases with the increase of damage. Moreover,the damage index RMSD of electric admittance shows that with the increase of the crack width,the damage index RMSD also increases. These conclusions can provide some reference value for the identification of structural damage.