基于运行模态的复合材料梁脱层损伤识别

为了实现复合材料结构损伤的定位与定量识别,利用传递率函数的运行模态分析方法探讨了复合材料梁无损检测方法,通过对加速度传递函数的最小二乘拟合,得到结构的模态频率和阻尼,对传递率函数矩阵奇异值分解,得到结构的振型.运用曲率模态(CMS)和曲率模态变化率(CMSI)作为损伤指标,对具有单损伤、多损伤和不同损伤程度的复合材料梁...

Delaminate Damage Identification of Composite Beam Based on Operational Modal

The method of nondestructive testing of composite beams is discussed by using the operation mode analysis method of the transmissibility functions, by fitting the least squares of the acceleration transfer function, the frequency and damping are obtained,the mode shape is obtained by decomposing the singular value. Curvature mode shape (CMS) and curvature mode shape change rate (CMSI) are presented as damage indexes, modal analysis of composite beam structures with single, multiple and different damage degrees.The results show: the location and size and multiple damage of the damage can be identified. The transverse coordinates can reflect the location of the damage, and the spacing of the mutated units can reflect the size of the damage; the mutation extreme difference of the CMS and CMSI were found to increase with increasing damage degree, demonstrating that the CMS and CMSI has the ability to quantitatively identify damage degree; Compared with the CMS, the CMSI is more sensitive to the composite beams damage.