关键词: 动力学, 多体系统, 过盈接触, 伸缩杆

Abstract: 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.

Key words: Dynamics, Expansion link, Interference-contact, Multibody system