H-IIA rocket is Japanese main launch vehicle to put about four tons payloads (artificial satellites) into Geosynchronous Transfer Orbit at an altitude of some 36000 kilometers. The rocket consists of many components including tanks, engines, valves and electric equipments. In these components the valves are very important flow control equipments to control rocket flight operation, such as to startup and shutdown engines, to maintain tank pressure, to feed propellants to engine, and to control vehicle attitude in flight. So the highly reliable valves are necessary to complete the mission successfully. To realize highly reliable valves, the authors tried to apply QFD methods to the recent H-IIA valve improvement program. In this paper they described these approach and accomplishment of reliable valve development process for H-IIA rocket. By defining some kinds of the degree of importance of structure, improvement of the main seal and the bearing were given top priority. By RD some BNE were extracted. So resources were invested into these developments for early solution. All structures not influenced for the worse by the design changes of the main seal and the bearing design were checked by QFD tables. As result the new design of FDV was verified to be more reliable one. In this activity the validity of the new process developing highly reliable valves with QFD method was verified. In the prototype model test conducted in the last spring, the new FDV showed expected performances. Now qualification model is under manufacturing and the final qualification test will be preformed in this winter.
Development of highly reliable valves for H-IIA rocket
2007
8 Seiten, 14 Bilder
Conference paper
English
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