Considering the special walking behavior of astronauts on the lunar surface,to reduce the impact on their bones and improve safety during extravehicular operations and walking,a magnetorheological(MR)damping mechanism...Considering the special walking behavior of astronauts on the lunar surface,to reduce the impact on their bones and improve safety during extravehicular operations and walking,a magnetorheological(MR)damping mechanism of power assisted transmission joint used in a new type spacesuit is proposed.In order to improve the damping performance of the MR damper,the influence of the damper s structural parameters on both the output and dynamic adjustable range of the damping torque is examined.According to the theoretical mechanical model,the output damping torque is calculated,the finite element method is used to conduct numerical tests.At the same time,the structural parameters of the damper are optimized by the response surface methods.The results indicate that the simulated torque aligns with the theoretically designed torque,and the damping characteristics of the optimized structure are effectively improved by the response surface method.Compared with the initial structure,the damping torque is increased by 10.8%,and the dynamic adjustable range is expanded by 52.9%.展开更多
Deep space is incredibly quiet,but once astronauts leave the station,they must contend with extreme temperatures,fluctuating pressures,and high levels of radiation.Their spacesuits are equipped with life-support syste...Deep space is incredibly quiet,but once astronauts leave the station,they must contend with extreme temperatures,fluctuating pressures,and high levels of radiation.Their spacesuits are equipped with life-support systems,which are essential for a safe“walk in space.”On 15 August,the crew of Shenzhou-20 successfully completed their third spacewalk.For this mission,taikonaut Chen Dong wore the extravehicular spacesuit B,which has now been used in 20 spacewalks.With this achievement,the space station has reached the target of“four years and 20 spacewalks.”展开更多
基金The Natural Science Foundation of Shanghai(No.20ZR1401300).
文摘Considering the special walking behavior of astronauts on the lunar surface,to reduce the impact on their bones and improve safety during extravehicular operations and walking,a magnetorheological(MR)damping mechanism of power assisted transmission joint used in a new type spacesuit is proposed.In order to improve the damping performance of the MR damper,the influence of the damper s structural parameters on both the output and dynamic adjustable range of the damping torque is examined.According to the theoretical mechanical model,the output damping torque is calculated,the finite element method is used to conduct numerical tests.At the same time,the structural parameters of the damper are optimized by the response surface methods.The results indicate that the simulated torque aligns with the theoretically designed torque,and the damping characteristics of the optimized structure are effectively improved by the response surface method.Compared with the initial structure,the damping torque is increased by 10.8%,and the dynamic adjustable range is expanded by 52.9%.
文摘Deep space is incredibly quiet,but once astronauts leave the station,they must contend with extreme temperatures,fluctuating pressures,and high levels of radiation.Their spacesuits are equipped with life-support systems,which are essential for a safe“walk in space.”On 15 August,the crew of Shenzhou-20 successfully completed their third spacewalk.For this mission,taikonaut Chen Dong wore the extravehicular spacesuit B,which has now been used in 20 spacewalks.With this achievement,the space station has reached the target of“four years and 20 spacewalks.”
