基于多体动力学的发射装置托架拓扑优化设计

为了更好地实现某型导弹发射装置托架轻量化,结合多体动力学并基于SIMP法的拓扑优化理论,运用OptiStruct平台对托架进行拓扑优化设计。根据导弹发射精度要求,建立了优化约束条件,得到了典型射击工况下托架的最佳材料分布和传力路径。考虑工程应用实际情况,得到了托架优化模型。参考比刚度结构效能,建立了结构刚度评价标准,对优化前后托架模态、发射动态响应以及导弹初始扰动等进行了对比分析。结果表明:与初始模型相比,优化后的托架比刚度效能增加了27.8%,质量减小了28.6%; 该方法提高了托架一阶模态频率,降低了托架与发射筒的共振效应对导弹初始精度的影响。

Topology Optimization of Launcher Bracket Based on Multi-body Dynamics

In order to achieve the lightweight bracket of a certain missile launcher,the topology optimization of the bracket was realized through the platform of OptiStruct by using the method that the multi-body dynamics was combined with the theory of topology optimization based on SIMP.According to the requirements of launching accuracy of missile,the optimization constraints were established,and the optimum material-distribution and force transmission-path of the bracket under typical shooting conditions were obtained.Considering the actual engineering application,the bracket optimization model was obtained.With reference to the structural efficiency of the specific stiffness,the evaluation criteria of the structural stiffness were established.The bracket modes,launch dynamic response and initial disturbance of the missile after optimization were compared with those before optimization.The results show that,compared with the initial model,the specific stiffness efficiency of the optimized bracket is increased by 27.8%,and the mass is reduced by 28.6%.The first-order modal frequency of the bracket is increased,and the influence of the resonance effect of the bracket and the launch tube on the initial accuracy of the missile is reduced.