极端温度下含隙铰柔性帆板展开位置精度分析

以自主研发的月球车重复可展帆板为研究对象,分析月表极端温度对其展开末端位置可靠性的影响.构建极端温度与帆板材料、铰链结构间的关系函数,基于运动弹性动力学,建立极端温度下可展帆板间隙-柔性耦合动力学模型.以帆板展开末端位置误差为评价指标,将BP神经网络算法与一次二阶矩法相结合,利用应力-强度理论建立帆板展开末端位置可靠性...

Precision Analysis of Deployable Position of FlexibleSolar Array withGap Hinges at Extreme Temperature

Taking the independently developedrepeatedly deployable solar array of lunar rover as the research object, theinfluence of the extreme temperature of the lunar surface on the reliability ofthe end position of the deployed solar array is analyzed. The relationshipfunction between the extreme temperature and solar array materials and hingestructure is constructed. Based on the kinetic elasticdynamics, the gap flexible coupling dynamic model underextreme temperature is established. Taking the end position error of the solararray as the evaluation index, combining the BP neural network algorithm withthe first order second momentmethod, the stress strength theory is used to establishthe reliability model of the end position of the solar array. The calculationof the classical MC method is compared and verified to determine thefeasibility and efficiency of the neural network method. The results show thatunder the extreme temperature conditions, the hinge clearance has a significanteffect on the position reliability. Within the temperature range of -30-20 ℃, the reliability of the end position of the deployed mechanism isoptimal.