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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Dec 14 2011, 09:15 AM
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#2
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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 58 Table II-2-6 History of LV2 use (this is a simple table and I just translate the contents in the easiest way as follows. Number of days is just approx.) Valve remained closed for : 15 days before use as LV2 CLOSE before launch (delta V1) (why delta V at all before launch beats me, P) 42 days before use during delta V1 to delta V5 80 days before use during delta V5 to delta V8 40 days before use during delat V8 to delta V9 (TMI) end of page 58 page 59 Fig. III-1-1 Nozomi power system schematic With this schematic I will have to be very descriptive. It all starts from the leftmost square, which is the solar battery. To the right immediately, and effectively it is a column containing mostly power units, from P1 to P15, say. I hope you can see numbers in this column and I hope they are numerics coded with a single digit. If not you may be looking at a mess. However, between P2 and P3 there are two more squares. One is "Beacon mode" and the other below it is "Telemetry mode". Actually, there is another square further down between P4 and P5 and that says "Attitude control system and other instruments for observation". Now, going back to P1 power is sent down to a switch called "Temp. control circuit" which controls the "Main prop. system heater" at the extreme up and right on the schematic. There is another switch immdeiately below a long horizontal oblong square. This oblong square says "Telemetry Command Interface (TCI)". This second switch is meant to swtich between "Beacon mode" and "Telemetry mode". There is another square below this switch which says "Transmitter 1" (and I do not find any other transmitters on the schematic, P) and this transmitter is connected to P3 and the switcher above. Transmitter is also connected to the receiver below it. Both transmitter and receivcer are connected to the antenna on the right (extreme right) and the receiver is receiving power from P4. The longish square at the bottom says "Data Handling Unit (DTU)" and it has a two way power connection with the telemetry command interface. DTU also connects to the command decoder which sits between the receiver and DHU. In addition, trhere is another strange square floating below temp. control circuit and the telemetry command interface and it says "Short cicuiting failure" and I do not know why it is sitting there, P. end of page 59 |
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