Other
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.508q&link_type=abstract
IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,
Other
Scientific paper
Space docking technique has been developed and applied quickly. The system used to implement two spacecrafts' docking mission is called as "Berthing and Docking Mechanism". During rendezvous, damping system in space docking mechanism arrests the relative motion of the two vehicles and prevents them from colliding. Therefore, damping mechanism is the most critical and complicated section of berthing mechanism in both function and structure. The research and development on the structural and functional capabilities of docking hardware is of great significance. Dynamics modeling, simulation and optimization are essential to the study of the docking mechanism, the dynamics simulation of docking process and the development of new design concepts for advanced docking unit. mission-the androgynous peripheral assembly system (APAS). Two simulation and analysis methods were used to evaluate/optimise APAS: Automatic Dynamic Analysis of Mechanical Systems (ADAMS), and Numerical Programming of the Dynamic Mathematical Models. In the ADAMS model, a virtual prototype of the docking mechanism was built on a SUN workstation, which consists of over one hundred three-dimensional parts and sub-assemblies. Except for the friction, clearance, etc., the prototype is almost as same as the actual mechanism. Meanwhile, based on the virtual work principle, a mathematical dynamic model of the system was developed where the momentum of the springs, electromagnetic dampers and friction clutch was converted to the equivalent forces acted on the ball screw/nut assemblies. Many analysis and tests were performed on both of the models, and the results helped to investigate how the two models correlate with each other. Because the ADAMS model was based on the three-dimensional models of all parts of the docking mechanism, the result was thought more accurate and used to revise the mathematical model to perform dynamic simulation of docking event. Various characteristics of the mechanism's response were discovered and explained with the analysis tools. These findings have been essential in ensuring a successful mission. The simulation results proved that the methods this paper presented be very efficient and valuable.
Qu Yanli
Xiao Yuzhi
Zhang Chongfeng
Zhao Mingyang
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