航天员出舱活动用移动扶手原型设计与试验验证OA北大核心CSTPCD

In view of the problem that the extravehicular fixed handrail is difficult to meet astronaut's complex extravehicular activity(EVA)needs,we propose a new design of movable handrail to benefit the EVA of astronauts.Specifically,we fully consider the hand force characteristics of astronauts in the pressurized spacesuit and design the parameters for geometric dimension and spring stiffness of each operating component in the movable handrail.In addition,in order to meet the needs of astronauts to operate the movable handrail with one hand during EVA,each operating component can be self-lock.Dynamics simulation analysis of each operating component is performed with ADAMS software.Simulation results show that operating components can be locked under appropriate operating force.We develop an engineering prototype of the extravehicular movable handrail based on the design and analysis result.Experimental verifications are carried out in terms of function,environment and ergonomics,which show that the proposed prototype can not only realize the clamping of the extravehicular fixed handrail but also freely adjust its own length and angle.In addition,the measured operating force is basically consistent with the theoretical value,and there is little change in the operating force before and after the force and thermal environment tests.All these experiments show that the proposed movable handrail has good adaptability to low-orbit environment of the space station.