Landing Performance Analysis and Multi-Parameter Optimization of Oil-Gas Separation Shock Strut of Landing Gear

Taking the oil-gas separation shock strut of the landing gear as research object, the gas-liquid-solid coupled dynamic modeling and simulation analysis were carried out by comprehensively considering the oil-gas buffer characteristics and the structural flexible bearing characteristics. On this basis, the multi-parameter optimization model was established with the buffer efficiency and landing impact overload as the optimization target. An optimal solution satisfying the performance requirement is obtained. Through iterative optimization, the buffer efficiency grows 4 %, the landing impact overload decreases 8%. Influences of forward inclination angle on structure deformation and mounting joint loads transferring to the airframe are analyzed. The results show that the forward inclination angle has a great influence on the heading load of the shock strut.

I. Introduction

The shock strut is one of the critical components of landing gear system, and its landing performance directly affects the safety and stability of landing. In recent years, more and more attention has been paid to aerospace vehicles because they can travel from the ground to near space or space orbit many times for the task of fast long -distance transportation and fast access to space[1], which has become the focus of research in global countries. In order to carry more fuel and payload, the aerospace vehicle has very strict requirements on net weight. Therefore, improving the landing buffer performance of the aircraft to reduce landing impact load that plays a main role in structural stress distribution and the weight of the aircraft have become urgent technical problems for landing gear designer.