变构型桁架式卫星平台结构设计与性能评价

为实现大型通信卫星内部有效载荷维修可达,根据传统卫星平台的框架结构和承力结构,设计了6种可重复变构型桁架式卫星平台构型.提出评价变构型卫星平台性能的主要指标,包括结构质量、惯量变化率、整流罩面积利用率、展开表面积比、展收状态下振动频率、设备布局影响和折展机构复杂度等.分析6种变构型桁架式卫星平台构型的上述性能指标,采用层析分析法得到各个性能指标的权重,基于模糊综合评价法优选出综合性能较佳的构型.根据空间机构多闭环自由度计算公式计算出优选构型折展机构自由度为1,该折展机构具有唯一确定的运动.完成了优选构型的结构设计,并制作3D打印模型演示了变构型过程,卫星平台原理上可实现可重复变构型的功能.

Structure design and performance evaluation of variable configuration truss-type satellite platform

To service the internal payload of communication satellite, according to the main frame structures and main bearing structures of traditional satellite platforms, six kinds of repetitive variable configuration truss-type satellite platform structures is proposed, and the main indexes, including mass, inertia change rate, utilization rate of fairing area, deployed surface area ratio, vibration frequency in folded and deployed state, equipment layout effect and complexity of deployable mechanism, for evaluating the performance of variable configuration satellite platform are put forward. Then the main indexes of those six satellite platform structures are analyzed, the weights of those indexes are obtained by analytic hierarchy process method, and a scheme with better comprehensive performance is selected using fuzzy synthetic evaluation method. The mobility of the deployable mechanism of the optimal scheme is 1. The satellite platform structure of the optimal scheme is detailed designed, and a prototype is manufactured to demonstrate the process of variable configuration.