某大口径火炮身管坡膛结构优化设计

Optimization Design of Chamber Structure of a Large-Caliber Gun Barrel

以某大口径火炮为研究对象,应用有限元数值仿真技术建立挤进过程弹炮耦合模型,对挤进过程能量转化与耗散规律进行了研究。通过Fortran二次开发结合ABAQUS/Explicit模块,计算得到摩擦耗散功率与塑性变形功率,通过对不同坡膛锥度的挤进模型进行数值仿真,获得耗散功率随坡膛锥度变化的规律,以摩擦耗散功率和塑性变形功率最大值为优化目标,以坡膛锥度为优化变量,采用线性加权法建立坡膛结构评价函数,利用多岛遗传算法求得最优值。通过对比分析对优化结果进行验证,结果表明:优化后的坡膛结构使得挤进过程摩擦耗散功率最大值与塑性变形功率最大值分别减小了6.1%和19.0%。

Taking a large-caliber gun as the research object,the finite element numerical simulation technology is applied to establish the projectile-barrel coupling model in the squeezing process,with the energy conversion and dissipation law of the squeezing process studied.The frictional dissipation power and plastic deformation power are calculated through the Fortran secondary development combined with ABAQUS/Explicit module,and the dissipation power changes with the bevel bore taper by numerical simulation of the squeezing model with different bevel bore tapers,with maximum power dissipation power of friction and plastic deformation as the optimization goal,with slope taper bore as optimization variables,using the linear weighted method to establish the chamber slope structure evaluation function.Finally,the optimal value is obtained by multi-island genetic algorithm.Through comparative analysis,the optimization results are verified,which shows that the optimized bevel bore structure reduces the maximum frictional dissipation power and the maximum plastic deformation powerof the squeezing process respectively by 6.1%and 19.0%.