Nozomi in perspective, Revisiting the causes of failure Options

[pandaneko]

http://www.mext.go.jp/b_menu/shingi/uchuu/...ts/04061101.pdf

Above pdf file will be translated for aspiring students in aeronautics, control engineering etc. so that in future lay people like me will be able to enjoy planetary scenes and events without worrying about failures.

The overall title is "Looking into the causes of failure and trying to find the right measures to take for the future with respect to the 18th scientific satellite (PLANET-B ) not inserted into Mars orbit as planned" and it is dated 21 May 2004.

This file is very much detailed at 1.1 megabytes and the number of pages is about 40, I think. In addition, I will be translating 3 more files after this particular file. They will be;

1. ISAS file with views and comments on the failure
2. Another ISAS file, a newsletter written out in a series of 4 individual letters.
3. JAXA file, which is a press release and it is a very concise document with just sufficient details.

Re concise link making I tried a few times, but I simply failed and all the links will be fully pasted out as required.

Pandaneko

[pandaneko]

http://www.mext.go.jp/b_menu/shingi/uchuu/...ts/04061101.pdf

above for ease of reference

page 14

History of LV2 tests

Confirmation tests of LV2 were carried out in two major parts. One is the design quality confirmation test where another test piece different from the flight piece was fabricated and offered to testing. Second is the confirmation test for flight model manufacturing approapriateness, which is conducted on the flight model. Their outlines are shown below and the ground test history of LV2 is carried on the table II-2-2.


① Design quality confirmation test

This is the test whereby design validity is confirmed. In addition to the test conducted by the US valve manafacturer another test was carried out in Japan.

The valve manufacturer conducted their own test using two test pieces, LV2 and a similarly designed LV1 together with HLV. In Japan we used a spare part, common to both LV1 and LV2, and conducted a confirmation test on the adaptability to the oxidiser (NTO) environment.

We had been given a report from the manufacturer that the valve in question had resistance to NTO and ours was carried out seperately to confirm this report using the flight piece of the valve. The number of valve actions during this test is shown on the table II-2-3.

② Confirmation test for the manufacturing validity of the flight model

This was the test conducted on the flight model. Confirmation was sought with the part built into the satellite system for its health. Below is the number of delivered pieces.

・LV1、LV2 : one each
・LV1、LV2 common piece: two
・HLV: one and HLV spare part: one

2) Action history of LV2

The number of counted valving actions during TMI with the valve in question was 42nd since the day of the delivery and 6th from the day of launch. It was confirmed that all valving actions prior to that had been normal. LV2 action history is shown on the table II-2-4.

end of page 14

P