火箭整流罩声振环境缩比特性研究

针对火箭整流罩全尺寸声振环境试验过程中难度大、成本高的问题，通过量纲分析的方法建立了缩比模型的相似准则，研究并获得了缩比模型与原模型之间内部声场、壁面振动加速度的关系，并使用声学有限元方法(FEM)进行了仿真计算。仿真结果表明，缩比模型与原模型场点处声压级相吻合，壁面振动加速度成一定的比例关系，符合缩比准则结果。该方法为火箭整流罩的声振环境预示和试验提供了理论依据。

Research on Scaling Characteristics of Sound Vibration Environment of Rocket Fairing

In terms of the difficulty and high cost of the full-size sound-vibration environment test of the rocket fairing, the similarity criterion of the scaling model is established by the dimensional analysis method. The study shows the relationship between the internal sound field and acceleration within the scaling models as well as the original model, and the finite element method (FEM) simulation is carried out. The simulation results show that the sound pressure level at the field point of the scale model is basically the same as that of the original model, and the acceleration is proportional to the model scale, which is consistent with the result from dimension analysis. This method provides a theory evidence for the sound-vibration environment prediction and test of the rocket fairing.