首次在轨开展寿命评估 舱外航天服是航天员在太空出舱活动中的核心装备，保障着航天员的生命安全和高效作业。中国空间站 舱外航天服是第二代"飞天"舱外航天服，按照设计标准，使用寿命为"在轨贮存3年，其间出舱使用次数 不小于15次"。 与陈冬一同创造"纪录"的，还有他身上穿着的舱外航天服B——它已累计保障20次出舱任务，成为中国 空间站首套实现"4年20次"延寿目标的舱外航天服。 2021年7月4日，在神舟十二号任务中，航天员刘伯明、汤洪波首次身着"飞天"舱外航天服A和B出舱， 并顺利完成出舱任务。随着时间的推移，至2024年初，在轨飞行的舱外航天服已经接近"3年15次"的寿 命设计指标极限。 航天服还能不能继续用？为了准确评估舱外服的剩余寿命，科研团队制定了科学合理的寿命评估、健康 监测方案和在轨检测方法。通过深入挖掘在轨和地面试验数据，科研团队开展了大量材料级和产品级的 验证试验，实现了舱外航天服在轨健康与延寿的动态精准评估。经评估，舱外服B状态稳定良好，从而 成为中国首次在轨开展寿命评估并延寿使用的飞行产品。 日前，神舟二十号乘组圆满完成第三次出舱活动。航天员陈冬、王杰完成了空间站空间碎片防护装置及 舱外辅助设 ...

Core Points - The Shenzhou-20 crew successfully completed their third extravehicular activity, with astronaut Chen Dong setting a record for the most extravehicular activities by a Chinese astronaut, totaling six [2] - The extravehicular suit B worn by Chen Dong has supported 20 extravehicular missions, achieving the goal of "4 years and 20 times" lifespan extension, marking a significant milestone for China's space station [2][4] Summary by Sections Extravehicular Suit Performance - The second-generation "Feitian" extravehicular suit is designed for a lifespan of "3 years with at least 15 extravehicular activities" [3] - As of early 2024, the suit has approached the limit of "3 years and 15 times" usage, prompting a need for a lifespan assessment [3] - A scientific evaluation and health monitoring plan was developed to assess the remaining lifespan of the suit, which has been confirmed to be in good condition [3] Technological Advancements - The "Feitian" extravehicular suit represents advanced technology and is crucial for ensuring astronaut safety and operational efficiency during extravehicular activities [5] - The suit features a multi-layer design for protection against vacuum, radiation, and extreme temperatures, with various layers serving specific functions [5] - The suit's flexibility is enhanced by a bionic structure and integrated helmet and torso design, allowing for better movement [5][6] Future Developments - Two new second-generation "Feitian" extravehicular suits (D and E) have been delivered to the space station, with an improved operational lifespan of "4 years and 20 times" [4] - The development of the lunar suit is progressing well, with plans for a manned moon landing by 2030, leveraging technologies from the "Feitian" suit [7] - The design philosophy for future suits includes modularity, lightweight construction, and multi-purpose integration to meet diverse mission requirements [7][8]