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建立自适应底座的精确数值模型,对底座进行优化设计研究。推导了帘线拉伸模量修正公式,给出了橡胶材料Mooney-Rivilin模型相关参数计算方法;建立了底座精确数值模型,得到附加载荷数值解并与试验对比验证;推导了附加载荷的积分表达式,获得了影响附加载荷的4个主要参数;以4个主要参数为设计变量,定义附加载荷匹配弹重为优化目标,基于试验设计方法(DOE)和神经网络算法(RBF),建立了底座数学近似模型,结合多岛遗传算法(MIGA)获得了底座的优化设计方案。结果表明:优化后底座的附加载荷峰值与弹重差值减小至原差值的9.1%,导弹俯仰、偏航方向角位移分别下降了8.2%、15.8%。
The accurate numerical model of adaptive base is established and the base is optimized and studied. The formula for calculating the tensile modulus of the cord is deduced. The calculation method of the Mooney-Rivilin model for the rubber material is given. The exact numerical model of the base is established, the numerical solution of the additional load is obtained and compared with the experimental verification. The integral expression of the additional load The four main parameters that affect the additional load are obtained. Based on the four main parameters as the design variables and the definition of the additional load matching elastic weight as the optimization objective, the base of DOE and RBF is established. Mathematical approximation model, combined with multi-island genetic algorithm (MIGA) to obtain the base of the optimal design. The results show that the difference between the peak value of the additional load and that of the projectile is reduced to 9.1% of the original difference, and the pitch and yaw displacement of the missile are decreased by 8.2% and 15.8% respectively.