基于振型数据的蜂窝夹芯板损伤检测

以含有结构损伤的四边简支铝制蜂窝夹芯板为研究对象,采用锤击法模态实验提取损伤蜂窝夹芯板的振型数据,并针对蜂窝夹芯板上不同位置、不同程度的损伤,分别采用振型差值、曲率模态和高斯曲率模态三种损伤识别方法进行识别.结果表明:在四边简支铝制蜂窝夹芯板中存在损伤时,结构损伤位置处的振型差值比较明显,说明采用振型差值法对结构损伤进行识别可以准确判定损伤的位置,且在损伤位置准确判定后,可根据该位置已有的差值信息进行损伤程度判定.

Damage Detection of the Honeycomb Sandwich Panel Based on Vibration Shape Data

An aluminous honeycomb sandwich panel with some structural damages was selected as the objective in this study.The panel was simply supported along four edges and its vibration shape data was collected through modal experiment with a hammering method.The damages with different degrees at different positions of the honeycomb sandwich panel were identified by three identification methods,i.e.,the modal difference of vibration shape,the curvature mode and the Gaussian curvature mode,respectively.It is found that the modal difference of vibration shape at the damage location is obvious when the honeycomb sandwich panel has some structural damages.This indicates that the damage location can be accurately identified by using the difference of vibration shape.Furthermore,the damage degree can be identified according to the difference at the damage location after the damage location is defined.