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
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
The human fingertip consists of a fingerprint with many micro-grating structures.The main roles of the fingerprint could be divided into two purposes,namely,the enhancement of the frictional force and the effective tr...The human fingertip consists of a fingerprint with many micro-grating structures.The main roles of the fingerprint could be divided into two purposes,namely,the enhancement of the frictional force and the effective transmittance of the biosignal.In this study,we present the fingerprint-inspired end-effector that has not only admirable frictional force but also electric conductivity.The end-effector is composed of fluorocarbon rubber,one of the famous materials to achieve high frictional force and robustness.Through various experiments,the novel performance of micro structured fluorocarbon rubber end-effector(MSFE)is characterized by comparing with a macroscale patterned sample(MPS),which has been already used in real industrial fields.Experimental results are analyzed theoretically.Furthermore,as feasible applications,we suggest two applications based on the role of the fingerprint.One is the conductive astronaut glove with high frictional force,and the other one is a non-slip pad for the next-generation glass transfer systems.Through these experiments,we successfully observe the enhanced system performance and confirm the possibility of using the MSFE as feasible applications.We believe that the MSFE could be a useful and powerful alternative as an end-effector,not only in the aerospace industry but also in display manufacturing processes.展开更多
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.”
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%.
基金This work was supported by the National Research Foundation of Korea Grant(NRF-2020R1A4A1018652 and 2019R1A2C1086766)Bridge program by the Korea Environmental Industry&Technology Institute(2021002800015)which was funded by the Korean government.
文摘The human fingertip consists of a fingerprint with many micro-grating structures.The main roles of the fingerprint could be divided into two purposes,namely,the enhancement of the frictional force and the effective transmittance of the biosignal.In this study,we present the fingerprint-inspired end-effector that has not only admirable frictional force but also electric conductivity.The end-effector is composed of fluorocarbon rubber,one of the famous materials to achieve high frictional force and robustness.Through various experiments,the novel performance of micro structured fluorocarbon rubber end-effector(MSFE)is characterized by comparing with a macroscale patterned sample(MPS),which has been already used in real industrial fields.Experimental results are analyzed theoretically.Furthermore,as feasible applications,we suggest two applications based on the role of the fingerprint.One is the conductive astronaut glove with high frictional force,and the other one is a non-slip pad for the next-generation glass transfer systems.Through these experiments,we successfully observe the enhanced system performance and confirm the possibility of using the MSFE as feasible applications.We believe that the MSFE could be a useful and powerful alternative as an end-effector,not only in the aerospace industry but also in display manufacturing processes.
