基于锤击法的复合材料层合板振动理论及实验模态分析

Composite Laminates Vibration Theory and Experimental Modal Analysis Based on Hammering Method

基于实验模态分析理论,构建了复合材料层合板的模态实验理论及测试系统。首先制备了150mm!80 mm!3.75 mm的碳纤维复合材料层合板,通过DH5922N动态数据采集仪提取了加速度传感器以及力锤所感应到的频响函数及激励信号。将频响函数导入DHDAS动态信号分析系统后获得复合材料层合板一阶及二阶固有频率分别为323.103和656.180 Hz,并测得对应频率下的各测点振型。结果表明,利用本文所提出的实验理论及所用设备可精确提取复合材料层合板的模态信息。

Based on the theory of experimental modal analysis, the modal theory and testing system of composite laminates is established. Firstly, composite laminates of 150 mm ×80 mm ×3.75 mm （length xwidth xthickness） were built-up. By using DH5922N dynamic data acquisition instrument, the frequency response function and the excitation signal sensed by acceleration sensor and force hammer are obtained. And frequency response function is analysised in the dynamic signal analysis system DHDAS. The first and second natural frequencies were 323. 103 Hz and 656.180 Hz respectively, and the shift values of each measurement point corresponding to the frequency were obtained. The ex- perimental results show that the experimental theory and the equipment used in this paper can be used to accurately extract the modal information of composite laminates.