泡沫夹层板脱粘损伤的小波分析检测技术研究

研究了一种通过对结构的应变响应进行复高斯二维小波分析来有效识别泡沫夹层板脱粘损伤的检测方法.数值模拟了无损板和多种脱粘损伤情况下的泡沫夹层板在悬臂条件、正弦激励下的应变响应,对损伤前、后的应变响应用复高斯二维小波进行小波变换,得出有损情况与无损情况下相应位置小波变换模极大值的差值,并用三维图表示出来.结果表明,相应位置小波变换模极大值的变化与脱粘损伤有很好的对应关系.小波变换模极大值变化量三维图中的峰值可有效表征脱粘损伤的位置和损伤程度.

DEBOND DAMAGE DETECTION IN SANDWICH FOAM CORE PLATES USING WAVELET TRANSFORM

An effective method of diagnosing sandwich foam core plate debond damages is studied.The strain response to sinusoidal sweep excitation of six cantilever plates-one intact and five with different debond damages are computed.The singularity properties of strain response are obtained by the means of wavelet transform.Application of complex Gaussian 2 wavelet is presented.The location and the degree of the damage are indicated by a peak in the spatial variation of the transformed response.