A Study on Dynamic Characteristics of Thin-Walled Cylindrical Cavities with a Large Aspect Ratio

The unstable combustion problem in small-sized solid rocket engines with a large aspect ratio is so complicated that its causes remain unclear. In this study, the coupled vibration between sound field and shell was proposed as possible cause. A engine structure abstracted into multilayer thin-walled cylindrical cavity followed by theoretical calculation simulation of inherent frequency. Next, fluid-solid coupling experimental platform function modal measurement established to verify accuracy simulated modes for acoustic cavity. Then, mode finite element model (FEM) theoretically calculated simulated, accompanied experiment internal Subsequently, compared On basis, new cause damage disintegration final working stage revealed. Moreover, brand-new idea inhibiting pressure oscillation-induced put forward.