伞状天线旋转关节运动功能的可靠性分析

针对某星载伞状天线展开机构中的旋转关节,分析指出了其运动功能可靠性中包含了两个并联的功能函数:即矩的功能函数和功的功能函数;利用随机函数的矩法和可靠性分析中的一次二阶矩法,分别对天线展开过程中的起始阶段、展开阶段和网面产生预紧力阶段,构建了按矩的功能函数和按功的功能函数对应的可靠性计算表达式;通过实例计算获得了天线展开机构运动功能的可靠性指标随展开角度的变化结果. 

Movement Reliability of Rotation Joint of Umbrella Antenna

Aiming at the rotation joints in deployment mechanism of umbrella antenna used in a certain satellite, the movement reliability has two parallel performance functions: the performance function according to rotation work and that according to rotation moment. Corresponding to the beginning phase, outspreading phase and the phase that the net has pressing force, the expressions of two performance functions were established respectively according to the position relations of all components. Secondly, two-kind reliabilities can be calculated from the two performance functions by means of the random functional moment method and the second moment method for reliability analysis. The movement reliability of one rotation joint can be got from two parallel reliability models. Finally, the change curve of the movement reliability of umbrella antenna outspread mechanism with outspreading angle was analyzed with an example. To the whole outspreading course, the reliability has the trent of first increase and then decrease, and the reliability of the beginning phase was smallest.