为预测固体火箭发动机多层结构间的粘结质量与发动机燃烧过程中药柱厚度的变化情况,应用半解析有限元法,分别对固体火箭发动机3种不同界面黏接质量的兰姆波频散曲线进行了求解。结果表明,当胶层质量相对变差时,频散曲线整体向左漂移。而当药柱厚度大于100 mm以后,频散曲线不再发生变化。药柱厚度从100 mm逐渐递减到0 mm的过程,频散曲线的整体向右漂移,且阶数越来越少,低阶模态波变化明显。

In order to predict the bonding quality between the solid rocket motor multilayer structure and the change of the grain thickness during the combustion process of the engine, the semi-analytical finite element method is applied to solve the Lamb wave dispersion curves of the three different interface bonding qualities of the solid rocket motor. The results show that when the quality of the adhesive layer is relatively poor, the overall dispersion curve drifts to the left. When the thickness of the grain is greater than 100 mm, the dispersion curve no longer changes. As the thickness of the grain gradually decreases from 100 mm to 0 mm, the overall dispersion curve drifts to the right, and the number of orders decreases, and the low-order modal waves change significantly.