Nozomi in perspective, Revisiting the causes of failure |
Nozomi in perspective, Revisiting the causes of failure |
Oct 23 2011, 09:12 AM
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Member Group: Members Posts: 817 Joined: 17-April 10 From: Kamakura, Japan Member No.: 5323 |
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 |
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Nov 24 2011, 09:39 AM
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Member Group: Members Posts: 817 Joined: 17-April 10 From: Kamakura, Japan Member No.: 5323 |
above for ease of reference page 30 3.Reflecting into the design philosophy of scientific satellites About the two accidents that befell on Nozomi and the causes of mulfunction and measures to be taken for future we have been talking about fuel supply and comms./thermal control systems respectively. Scientific satellites come in different shapes and internal structures depending on mission requirements. It is therefore important that we should reflect the measures we have discussed as a result of Nozomi's failure and particularly those ones that are commonly applicable to future scientific satellites into their design philosophy and development. What follows are those items which we think should be incorporated into the design philosophy of future scientific satellites. (1) Alterations to exisitng design Whenever we try to make changes in the desing of the components to go on board we should remind ourselves that this will carry the same degree of risks as in designing them from scratch even if these changes are to be made on those that have enough track records. For this reason it should become our design philosophy to examine the risks involved in changes made to proven designs and if we had to we should be taking every possible caution in determining the neccesity of desin alteration and possible repurcussions/verification methods etc. by calling for specialist advice from a wide range of desciplines. (2) Ground tests Naturally, with components and instruments to go on board any scientific satellites it is imperative that they are highly reliable with enough proven records. However, this is not always easy as mission contents and development times are all different and we may not always be able to fulfill these requirements. Therefore, it is important that pre-flight ground tests should amply verify and evaluate the reliability/functions/capacities of those components going on board. Furthere more, we should make sure that an exccessive loading is not placed on the pieces to be tested and that the test contents are sufficiently approapriate and effective (including the influence of operational environment) for the purpose of verification leading to reliable data by inviting professional advice from specialists both within and outside our organization. In the event of ground tests not leading to convincing reliability we should take a renewed look into the desing steps of to-be-on board components and insturments with a view to completely returning to design board. end of page 30 P |
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