过盈接触式伸缩杆的动态特性

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Interference-contact expansion link is an axial expansion mechanism of one uncontrolled spacecraft. The dynamic behavior effects weightily on normal operation of the spacecraft. In order to study the dynamic behavior of expansion link in working process, a dynamics method of interference-contact expansion link based on flexible multi-body systems dynamics is developed in mixed coordinate system, by combining continuous impact model. A numerical calculation about kinematic character and dynamic behavior of expansion link in stretching process is carried out. The displacement and mechanical property are received. And a finite element analysis （FEA） for each expansion link at 0.31s is done, the FEA result tallies with kinemics analysis. The results indicate that expansion links stretch in order by constant force, and the motion of dynamic interference fit is completed; the link which pulling force acts on is disturbed firstly, and its disturbance amplitude is maximal, the disturbance trend of four links is coincident; the expansion link is distorted by acting force, the distortion brings contact-impact between the links, and the contact-impact intensify the distortion and disturbance father.某无控空间飞行器的轴向展开机构是一类过盈接触式伸缩杆,伸缩杆的动态特性对飞行器的正常工作起重要作用。为研究伸缩杆在工作过程中的动力学特性,基于柔性多体系统动力学理论,结合含摩擦的连续碰撞模型,建立混合坐标下的过盈接触式伸缩杆的动力学研究方法,对伸缩杆拉开过程的运动行为和动力学特性进行数值研究,得到杆的位移和受力情况,同时对0.31s时刻的各伸缩杆进行有限元分析,有限元分析结果与运动分析相吻合。研究结果表明：伸缩杆在恒定拉力作用下依次打开,能够完成动态过盈配合;拉力直接作用的伸缩杆先发生扰动,并且扰动幅度最大,四根伸缩杆的扰动趋势一致;伸缩杆受力产生变形,变形造成杆间的接触碰撞,接触碰撞进一步加剧杆的变形和扰动。