多层次修正的纤维增强复合薄壳振动响应分析

摘要 采用多层次修正技术对纤维增强复合薄壳的振动响应进行了分析.首先，考虑了复合薄壳纤维方向的影响，并采用Ritz法求解获得了复合壳的振动响应.其次，利用多层次修正技术和测试获得的实验数据，对复合薄壳的几何参数和物理参数进行修正，进而获得了较为精准的理论模型.最后，以T300碳纤维/树脂基复合薄壳为例，搭建了激光旋转扫描测试系统，并获得了前6阶固有频率、模态振型和振动响应.修正后计算获得的共振响应数据与实验测试共振响应数据的误差在5.2%~14.3%之间，处于允许的范围内，进而验证了该分析方法的正确性.
Abstract：The vibration response of fiber-reinforced composite thin shell was analyzed based on the multilevel correction technique. Firstly， the theoretical model was established by considering the influence of fiber orientation， and the vibration response was solved by using the Ritz method. Next， the more precise theoretical model of composite thin shell was obtained by using the multi-level correction technique and the experimental data. Finally， T300 fiber/epoxy composite thin shell was taken as the study object and the laser scanning test system was set up to obtain the first 6 natural frequencies， modal shapes and vibration responses. By comparing the experimental resonant response results with the calculated results after adopting the multilevel correction technique， it was found that the calculation error is in the range of 5.2%~14.3%， which is within an acceptable level， and thus the correctness of the above analytical method was verified.