空降车着陆缓冲过程结构强度分析方法研究

摘要

为了研究空降车着陆缓冲过程中的结构强度,采用有限元方法建立了车体-气囊有限元模型,在两种工况下进行仿真计算,获得最大加速度结果,并将有限元仿真与加速度试验结果对比.仿真结果能准确反映空降车着陆缓冲过程,车体冲击加速度满足着陆缓冲过程的要求.进一步得到了正常着陆工况和恶劣着陆工况下车体的应力分布情况,结果表明,车体最大Yon Mises应力小于材料的抗拉强度,车体的结构强度满足设计要求.%A finite element model of hull and airbags for landing cushion process was established to research structure strength in landing cushion process of airborne vehicle based on finite element method. On this base, the maximal acceleration results of simulation were given under two conditions and compared to the results of airdrop tests. The simulation results can reproduce the landing cushion process of airborne vehicle exactly. The impact acceleration of hull satisfies requirement of landing cushion process. The stress distribution in normal airdrop condition and worse airdrop condition were obtained through simulation. The results show that the maximal Von Mises stress values of hull don't exceed tensile strength of the material, and the structure strength fulfils design requirements.