弯扭耦合层合板模态特性数值模拟与试验研究

Modal test and numerical analysis of a bending-torsion coupling laminate plate

通过不同位置采用对称偏轴铺设纤维实现层合板的弯扭耦合,利用模态试验和有限元数值模拟研究弯扭耦合层合板的振动模态特性。采用单点拾振的方法采集层合板振动数据,分析其固有频率和振型参数,研究不同耦合区域层合悬臂板的模态节线位置,并且与有限元模拟结果进行对比。提出采用模态置信因子(MAC)定量描述层合板的弯扭耦合性能的方法,实现了采用模态特性研究层合板的弯扭耦合效应。结果表明,层合板的耦合效应,在低阶模态时中部耦合板显著,而高阶模态时端部耦合板显著。

The bending-torsion coupling of laminate plates was analyzed from the modal analysis point view,symmetric off-axis orientations in different location were proposed to perform the coupling feature.The frequency and mode shapes were studied experimentally and numerically.The multi-point excitation and single point measurement method was used to acquire the vibration data of the laminates,and analyze the natural frequency and vibration mode parameters.The nodal lines of laminated cantilever plates in different coupling regions were studied,and compared with finite element simulation results.A new method was proposed to quantitatively describe the bending-torsional coupling performance of laminates using modal confidence factor moal assurance criterion(MAC).The results show that the coupling effect of the centrally coupled laminates is significant at low-order vibrations,while the coupling effect of the end-coupled laminates is significant at higher-order modes.