DESIGN AND STRUCTURAL CHARACTERISTICS OF GAS GIMBAL APPARATUS IN LOX/KEROSENE ROCKET ENGINE

摘要

This paper focuses on the design and analysis of a gas gimbal apparatus which is consisted of a new S-shaped bellows, armored ring and metal meshy sleeve. Firstly, a new S-shaped bellows which is characterized as the 3-arcs bellows is designed, and the parameter sensitivities are obtained through correlation analysis, principal component analysis, ANOVA, and single-factor analysis. Secondly, the theoretical methods and finite element models to evaluate the enhancement mechanisms of armored ring and metal meshy sleeve are established, the enhancement performances such as pressure resistance, structural stability, and rigidity are acquired respectively. The simulation results show that the whole bellows is in uniform stress and deformation as the S-shaped bellows compensates the bending deflection, and multilayer bellows is highly recommended. By assembling armored ring and metal meshy sleeve, the gas gimbal installation can bear high pressure and keep good flexibility and stability.