固体火箭技术2025，Vol.48Issue(5)：704-713,10.DOI:10.7673/j.issn.1006-2793.2025.05.008
声激励作用下内衬与壳体的结构-声压耦合
Structure sound pressure coupling of liner and case under acoustic excitation
摘要
Abstract
The frequent combustion and ballistic instability of solid rocket motors at the end of combustion affect their flight sta-bility.To investigate the potential influence of structural vibration-acoustic field interactions on this phenomenon,the combustion chamber of a solid rocket motor was simplified as a steel tube structure lined with rubber and analyzed by a combination of experi-ment and numerical simulation.The acoustic pressure and acceleration oscillation characteristics under acoustic excitation with dif-ferent rubber thicknesses,tube lengths,and tube diameters were studied experimentally.The influence of rubber thickness on the natural frequency of the structure was investigated through simulation.The results show that,with the decrease of rubber thickness,the natural frequency of the structure decreases gradually and it may approach the low-order mode of the acoustic cavity under cer-tain conditions,leading to the interaction between the structure and the acoustic field.At the same time,the modulation effect of the structure on the acoustic field is weakened,resulting in a more concentrated main frequency of the acoustic field oscillation and an increased amplitude.The influence of the acoustic field on the structure is enhanced,increasing the amplitude of the acceleration oscillation of the outer case and weakening the vibration of the internal structure.In addition,the reduction of system mass and damping further strengthens the effect of the acoustic field on structural vibration and increases the significance of the structural re-sponse.Although the study did not directly involve combustion instability,the experimental and simulation results demonstrate that changes in structural characteristics affect the energy distribution of the acoustic field,potentially influencing the dynamic behavior of the combustion chamber and providing a reference for studying the mechanism of combustion instability.关键词
固体火箭发动机/燃烧不稳定/声不稳定性/振动-声耦合Key words
solid rocket motor/combustion instability/acoustic instability/vibration-acoustic coupling分类
航空航天引用本文复制引用
王浩煜,李子朔,万丽芬,熊永亮,郜冶..声激励作用下内衬与壳体的结构-声压耦合[J].固体火箭技术,2025,48(5):704-713,10.基金项目
国家自然科学基金面上项目(12472251) （12472251）
国家自然科学基金面上项目(12072125). （12072125）
