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 3 2011, 10:00 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 42 (main feature of this page is a figure and a table) Fig. II-1-1 Nozomi propulsion system outline Most of this figure is in English. There are 5 oblong squares in dark blue. 3 of them to the left and 2 of them to the right. Left ones from top to bottom are: Pusher gas tank He Fuel tank Hydrazine Auxilliary engine RCS (mono propellant) Right side one from top to bottm are: NTO tank Main engine (dual propellant) and the caption for this says "To be used for insertion into Mars transfer orbit" In addition, there are 5 squares in light blue: They indicate the status of the valves. In this diagram all of these 5 squares carry "OPEN". In further addition there are one red oblong square and the characters in there say: LV2: CLOSE->OPEN->CLOSE and one pale blue oblong square and the characters in there say: LV5,6: CLOSE->OPEN->CLOSE There are two circles in this figure and one near the top and the caption for that says "Valve which developped mulfunction" and the other one near the bottom is OME. There is a note also in the figure and it says "Valve status is all during TMI" The qualifiers in the figure are as follows. HLV: high pressure gas system latching valve LV1-2, LVm: low pressure gas system latching valve LV3-6: liquid system latching valve RG: regulator CV1-2: check valve F1-3: filter P1-4: pressure sensor FDV1-5: inlet/outlet valve TP1-5: test port A&T1-4, R1&2: RCS thruster OME: OME FTNK-A&B: hydrazine tank OTNK-A&B: NTO tank GTNK: He tank Table II-1-1 Main specs for propulsion system Here, I will translate column by column, from left to right and from top to bottom. Sometimes, I will add row numbers so that we know where exactly we are down the columns. Leftmost column and from top to bottom: pressure thruster specific impulse thruster specific impulse torque (9 and 10 are row numbers) gas container or gas reservoir? fuel tank (x2) oxidiser tank (x2) onborad propellant amount (20 and 21 Ditto) effective propellant amount propulsion system DRY mass propulsion system WET mass Now, second column from top to bottom: initial pressure in the primary pressure system initial pressure in the secondary pressure system axial (x4) radial (x2) tangential (x4) OME (x1) RCS OME 3rd column is as follows: precession spin inner volume MDP destruction safety rate inner volume MDP destruction safety rate fuel (hydrazine) oxidiser (NTO) for RCS for OME the next column is nominal specs and the contents are from top to bottom (and I omit those in English): 2.3N per base 2.3N per base 2.3N per base 27.8 litter 98 litter per tank 40 litter per tank and the last column is meant for notes and the contents are: (=24.5 MPa) (=1.37 MPa) at time of pulse is given lower or lowest limit of somekind of difference R=1m at time of two in action R=1m at time of two in action CFRP/titanium alloy sphere tatanium alloy tear drop shaped (=2.01 MPa) titanium alloy tear drop shaped end of page 42 P |
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