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 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