大型航天结构在轨组装阶段作动器布局优化

Optimal Configuration of Actuators in the Assembly Stage of Large Space Truss Structures

在轨组装阶段的大型航天结构具备“离散渐增”的特点,组装阶段其构型与参数不断改变.与固定构型航天结构不同,如何合理配置作动器以抑制组装过程中的结构振动目前还未见深入研究.针对这一问题,提出一种适用于大型航天结构在轨组装阶段的作动器分布式优化配置方法.根据结构模块化设计的特点,给出大型航天结构组装阶段作动器分布式优化配置的设计思路.建立面向组装阶段作动器布局优化的桁架结构动力学模型,并给出用于优化配置的目标函数.提出结合天牛须搜索的改进粒子群算法,以解决优化配置问题.最后给出在轨组装阶段作动器布局优化的数值仿真.结果表明通过改进的混合粒子群算法实现了大型航天结构在轨组装阶段的作动器分布式最优配置.

The large space structure in the assembly process has the characteristics of discrete increment,and its configuration and parameters are constantly change.Different from space structure with fixed configuration,there is currently no in-depth research on how to reasonably configure actuators to suppress structural vibration during on-or-bit assembly process.Hence,the optimal configuration of the actuators in the assembly stage of the large space structure is different from that in the on-orbit operation stage.Aiming at the problem,a distributed optimal configu-ration method of large space structure actuators in the assembly process is proposed in this paper.Considering the characteristics of large space structure which are assembled by modular substructures,the design concept for the ac-tuator distributed optimal configuration in the assembly stage of large space structure is first given.Secondly,the dynamic model of truss structure for actuator placement optimization in assembly process is developed,and the ob-jective function for optimal configuration is developed.The hybrid particle swarm optimization algorithm is improved by combing with the beetle antennae search algorithm;Finally,a numerical example of the position optimization of the actuators of the space smart truss structure in the assembly process is given.The results show that the distribu-ted optimal configuration of actuators in the assembly process of space truss structures is realized by the improved hybrid particle swarm optimization algorithm.