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日本的N-Ⅰ、N-Ⅱ运载火箭是用美国技术援助制造的.H-Ⅰ亦按美国许可证生产,因而其用途受到很大限制.为摆脱对美国的依赖,日本H-Ⅰ火箭的研制中,特别强调依靠自己的力量和技术.H-Ⅰ研制的重点是第二级的液氢/液氧发动机、第三级固体发动机以及惯性导航装置.1986年8月和1987年夏季H-Ⅰ分别发射成功.H-Ⅱ火箭虽然以H-Ⅰ的技术为基础,但两者的结构和特性有很大的不同.H-Ⅱ国产化程度达100%,性能更好,费效比和可靠性更高,能满足90年代空间任务的需求.对H-Ⅱ火箭的性能、研制规划及弹道和飞行特性作了重点叙述.
Japan’s N-I and N-II launch vehicles were manufactured with U.S. technical assistance and H-I was also manufactured under a US license and therefore its use was severely limited. To get rid of its dependency on the United States, Japan’s H-I rocket Development, with special emphasis on relying on their own strength and technology .H-Ⅰ development focused on the second level of liquid hydrogen / liquid oxygen engine, third solid-state engine and inertial navigation device 1986 August and summer 1987 H- Ⅰ were successfully launched respectively.H-Ⅱ rockets, although based on the technique of H-Ⅰ, have very different structures and characteristics.The localization degree of H-Ⅱ is up to 100%, the performance is better, and the cost-effectiveness ratio More reliable and can meet the needs of space missions in the 90s.The key points of H-Ⅱ rocket performance, development planning and ballistic and flight characteristics are described.