冗余驱动变后掠机翼驱动机构优化设计与分析

Optimization design and analysis of driving mechanism of redundant drive variable sweep wing

为满足对宽速域变后掠飞行器的迫切需求,设计了一种适用于分布式驱动的局部旋转变后掠机翼的过约束冗余驱动机构。以传动性能为指标对单元驱动机构进行尺度初步设计,后结合SQP(sequence quadratic program)算法以机构变形全过程的能量转化率为优化目标对机构尺度进行了优化,优化后的驱动机构在恒定作用力下的输出功提高了44.3%,能量转化率提高了37.5%,驱动距离缩短了9.7%。为解决多个驱动支链驱动力如何分配的问题,将分析超静定结构内力的力法与传统机构受力分析方法结合提出一种准静态驱动力的求解方法,对一定负载及构件材料条件下的四翼梁模型进行了驱动力计算并基于ADAMS(automatic dynamic analysis of mechanical system)在相同负载及构件材料条件下做了动力学仿真实验验证驱动力分配模型的精确度,误差分析显示该模型对于准静态驱动过程驱动力计算误差小于5.5%。最后综合仿真结果及驱动机构的质量对驱动链数目进行优化,确定了最佳驱动链数目为3个。

In order to meet the urgent demand of variable sweep aircraft in wide speed range,a kind of driving mechanism suitable for distributed driving of locally rotating variable sweep wing was designed.Taking the transmission performance as the index,the dimension of the unit driving mechanism was preliminarily designed,and then the SQP(sequence quadratic program)algorithm was combined to optimize the dimension of the mechanism with the energy conversion rate of the whole process of mechanism deformation as the optimization objective.The output work of the optimized driving mechanism under constant force was increased by 44.3%,the energy conversion rate was increased by 37.5%,and the driving distance was shortened by 9.7%.To solve the problem of how to distribute the driving force of multiple driving chains,a quasi-static driving force solution method was proposed by combining the force method of analyzing the internal force of statically indeterminate structure with the traditional force analysis method of mechanism.The driving force of the four wing beam models under certain load and component material conditions was calculated,and the dynamic simulation experiment was carried out based on ADAMS(automatic dynamic analysis of mechanical system)to verify the accuracy of the driving force distribution model.The error analysis showed that the calculation error of the quasi-static driving force of the model was less than 5.5%.Finally,based on the simulation results and the weight of the driving mechanism,the number of driving chains was optimized,and the optimal number of driving chains was determined to be 3.