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异体同构是指追踪飞行器和目标飞行器上对接机构的构造是一致的(“杆-锥”式对接机构是不一致的),没有主动与被动之分。周边式是指机构不设置在中间,而是设置在周边(“杆-锥”式是设置在中间)。异体同构周边式对接机构的优点在于对接后通道畅通,因对接连接环直径较大,承载能力大,适宜大质量航天器间对接;其缺点是结构比较复杂,质量较大。对接时,追踪飞行器上的对接机构伸出,安装在周边的3个板状导向器完成导向作用,使两个对接机构准确地接触,其上的锁被锁定,对接机构回缩,对接面拉紧并锁定,完成对接。异体同构周边式对接机构大体上有两类:导向器外翻和导向器内翻。导向器外翻的异体同构周边式对接机构只在1975年美国阿波罗-18飞船与苏联联盟-19飞船空间对接飞行时使用过,以后再也没有使用。目前使用的异体同构周边式对接机构都是导向器内翻式。
Allomorphism means that the structure of the docking aircraft on the tracking aircraft and the target aircraft is consistent (“rod-cone” docking mechanism is inconsistent), there is no active and passive points. Peripheral means that the mechanism is not set in the middle, but set in the periphery ( “rod - cone ” style is set in the middle). The advantages of the isomorphic isomorphic peripheral docking mechanism are that the post-docking channel is smooth, because the diameter of the docking ring is large and the carrying capacity is large, which is suitable for the docking between large-mass spacecraft; the disadvantage is that the structure is relatively complicated and the quality is relatively large. During docking, the docking mechanism on the tracking aircraft extends out and the three plate-shaped guides installed on the periphery complete the guiding action so that the two docking mechanisms can be accurately contacted, the lock on the locking mechanism is locked, the docking mechanism is retracted and the docking surface is pulled Tight and locked to complete the docking. There are basically two types of allomorphic peripheral docking mechanisms: guide eversion and guide inversion. Guided eversion of allogenic isomorphic peripheral docking mechanism only in the 1975 United States Apollo-18 spacecraft and Soviet Union-19 spacecraft spacecraft docking flight space used, never used again. The currently used isomorphic peripheral docking institutions are guides inverted.