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Nozomi in perspective, Revisiting the causes of failure
pandaneko
post Oct 23 2011, 09:12 AM
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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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pandaneko
post Dec 24 2011, 10:19 AM
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QUOTE (pandaneko @ Oct 23 2011, 06:12 PM) *


above for ease of reference

page 75

Table IV-2-2 Means for seperating out failure causes and their characteristics

(This is a C3R6 regular matrix inluding the headers in row 1)

C1R1: Failure cause seperation means
C2R1: Meritts
C3R1: Demeritts

C1R2: Resistances
C1R3: Fuses
C1R4: Relays and limtter circuits
C1R5: FET switches and limitter circuits
C1R6: Ideal redundancies

C2R2: system is easy and repetitive activations are possible.

C2R3: Setting up is easy.

C2R4: Repetitive activations are possible.

also, cancelling of latching up is possible.

There is a possibility to save components from temporary shortciruiting.

C2R5: Repetitive activation is possible.

There is no limit to the number of activation.

also, cancelling of latching up is possible. There is a possibility to save components from temporary shortciruiting.

It is very easy to set the system to OFF side without fail at the time of power on.

C2R6: It is possible to accept, at least once and perfectly as well, every possible failure mode.

C3R2: Need heat resistance at times of short circuiting.

Given voltage drop we may find it difficutlt to use this as "load current" may fluctuate.

C3R3: Once activated it will remain in the same state forever.

We need to check anti-vivration characteristics at launch times.

Action possible region is generally fairly narrow in that it will function without being affected by a sudden surge etc, with a current which will not affect other devices.

C3R4: Composition is very complex.

Relaying system itself needs watching out for failures and there is a limitation on the number of possible actions that can be taken.

If the relay system is of a "latch type" it may not improve the situation if:

1. there is another breaker downstream and
2. response speed upstream is slow

C3R5: Composition is very complex.

We need to allow for:

1. some extent of voltage drop
2. some extent of heat generation

C3R6: Impact on heavy resources is largest (I have no idea what they are talking about, P)

If we want to introduce cross-redundancies it will lead to the system getting very complicated and we will have to be extremely careful in design and verification.

We will need to evaluate its usefulness against the failure rate of similar redundant systems if:

1. the vulnerability against failure is very localised and/or

2. if the failure rate in question is very low in the first place.

end of page 75

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pandaneko
post Jan 17 2012, 10:11 AM
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What follows is the URL of the press release of JAXA on Nozomi's failure.

http://www.jaxa.jp/press/2003/12/20031210_nozomi_j.html

About this coding business I have been thinking about it for the last three weeks. Simplest would be to experiment. Here, I will switch on my hardware switch to write "1 A" using 16 bits coding. What goes before that is "1 A" with 8 bits coding.

1. 1 A with 8 bits coding: 1 A

2. 1 A with 16 bits coding: 1 A

With 2. above, I actually added one space with 16 bits coding and that may complicate this issue, but not by much, I hope...

If you can read them both without any problems, then I can forget about my worries about this, except that there might still be cases where the person(s) who wrote the whole thing may have used the mixture of 8 and 16 bits codings without consistency.

This is not a small matter of concern. On placing mail orders, for example, your order may be rejected. It does happen, here, often...

Pandanakeo
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pandaneko
post Jan 19 2012, 08:28 AM
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What follows is the URL of the ISAS pages I am about to ranslate for some time to come.

http://www.isas.jaxa.jp/j/enterp/missions/...status_01.shtml

Its rough title is something like "what Nozomi may have left for the success of future international planetary missions".

This is entirely in accordance with the purpose of my translating relevant files for the advancment of future missions and I am very pleased that I found this particular file for the communities with interest.

Translations will follow shortly. The original file consists of 4 contributions made by the same person and each may take up to a few times of translation. I will not be identifying the name of the person who wrote these pages.

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pandaneko
post Feb 2 2012, 09:42 AM
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QUOTE (pandaneko @ Jan 19 2012, 05:28 PM) *
What follows is the URL of the ISAS pages I am about to ranslate for some time to come.

http://www.isas.jaxa.jp/j/enterp/missions/...status_01.shtml

Its rough title is something like "what Nozomi may have left for the success of future international planetary missions".


continuing from yesterday,

4.MDC(Mars Dust Counter)


[Munich Inst of Tech, Tokyo U, ISAS/JAXA・LFM・MPIK・STMS, Kobe U, Dokkyo U, ESA]

Result: detection of interstellar dusts and others

This instrument would have measured both the velocity (1 km/s to 70 km/s) and the mass ( 10km/s dusts at 5×10-15~10-10 g ). Direct measurement of plasma's electronic charge changes due to high speed collision of dusts. Also, comparison with reference data for velocity and mass information.

The utmost objective was detection of Mars dust rings. It has been predicted that these rings were ring-like with Phobos, and torus-like with Dymos in distribution. MDC was supposed to look into this issue and offer information of these dusts distributions.

Nozomi had been detecting other dusts on way to Mars such as those coming from asteroids and comments, also those coming from outside our Solar system. The number was more than 40 by the end of 1999.


5.EIS(Electron and Ion Spectrometer)


[Tamagawa U, Waseda U, Rikkyo U, ISAS/JAXA, Tokyo Inst of Tech,MPIA]

Result: Solar flare observation and others


This instrument was to measure the enegy flux of high energy particles such as electrons, protons, helium ions, oxygeon ions etc over the range of 40 KeV to 500 KeV. Interaction between the solar winds and the uper atmosphere of Mars produces high energy electrons and ions (a few hundred eV to a few tens of KeV) and EIS was to look at these particles with a view to understanding the mechanisms for acceleration.


6.ESA(Electron Spectrum Analyzer)


[Kyoto U, ISA/JAXA, Rikkyo U, Tokyo U, Comms. Res. Lab, Tokyo Inst of Tech]

Result: observation of Lunar wakes

Electron energy flux was to have been measued (12 eV to 16 KeV). This would have given us a lot of information on the structure of magnetosphere and ionosphere of Mars and also the interaction between particle accerleration and wave/particle mutual interaction processes.

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- pandaneko   Nozomi in perspective   Oct 23 2011, 09:12 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Oct 24 2011, 08:53 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Oct 24 2011, 09:37 AM
- - Phil Stooke   Thanks for doing this. It is very interesting. P...   Oct 24 2011, 11:04 AM
- - nprev   Yes indeed, THANK you, Pandaneko! In my opinio...   Oct 25 2011, 01:51 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Oct 25 2011, 08:58 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Oct 26 2011, 09:26 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Oct 27 2011, 09:09 AM
|- - PaulM   I understand that the reason for the final failure...   Oct 27 2011, 11:52 AM
- - Paolo   the reason why Spirit and Oppy survived the April ...   Oct 27 2011, 12:09 PM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Oct 28 2011, 09:43 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Oct 29 2011, 09:39 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Oct 30 2011, 09:03 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Oct 31 2011, 09:38 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 1 2011, 09:19 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 2 2011, 09:22 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 3 2011, 09:36 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 4 2011, 09:50 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 5 2011, 09:30 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 6 2011, 09:03 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 9 2011, 09:23 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 10 2011, 09:51 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 11 2011, 09:09 AM
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- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 15 2011, 09:07 AM
- - Paolo   thanks again for the translations, panda! I kn...   Nov 15 2011, 06:21 PM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 16 2011, 09:49 AM
|- - pandaneko   QUOTE (pandaneko @ Nov 16 2011, 06:49 PM)...   Nov 16 2011, 09:53 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 17 2011, 10:27 AM
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- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 6 2011, 12:09 PM
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- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 11 2011, 09:57 AM
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- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 13 2011, 10:08 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 14 2011, 09:15 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 15 2011, 09:46 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 16 2011, 01:00 PM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 17 2011, 09:42 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 18 2011, 09:29 AM
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- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 21 2011, 11:27 AM
- - Paolo   thanks panda, I look forward to your translations ...   Dec 21 2011, 01:08 PM
|- - pandaneko   QUOTE (Paolo @ Dec 21 2011, 10:08 PM) tha...   Dec 21 2011, 01:44 PM
- - elakdawalla   I was thinking that a way to make good use of pand...   Dec 21 2011, 05:52 PM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 22 2011, 10:56 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 23 2011, 09:36 AM
- - Astro0   That's a great story about the 16-bit coding ...   Dec 23 2011, 09:42 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 24 2011, 10:19 AM
|- - pandaneko   What follows is the URL of the press release of JA...   Jan 17 2012, 10:11 AM
|- - pandaneko   What follows is the URL of the ISAS pages I am abo...   Jan 19 2012, 08:28 AM
|- - pandaneko   QUOTE (pandaneko @ Jan 19 2012, 05:28 PM)...   Jan 20 2012, 09:06 AM
||- - pandaneko   QUOTE (pandaneko @ Jan 20 2012, 06:06 PM)...   Jan 22 2012, 12:57 PM
||- - pandaneko   QUOTE (pandaneko @ Jan 22 2012, 09:57 PM)...   Jan 23 2012, 09:16 AM
||- - pandaneko   What follows is the chunck immediately following t...   Jan 24 2012, 10:07 AM
|- - pandaneko   QUOTE (pandaneko @ Jan 19 2012, 05:28 PM)...   Jan 25 2012, 09:47 AM
|- - pandaneko   QUOTE (pandaneko @ Jan 19 2012, 05:28 PM)...   Jan 26 2012, 09:33 AM
|- - pandaneko   QUOTE (pandaneko @ Jan 19 2012, 05:28 PM)...   Jan 27 2012, 08:44 AM
|- - pandaneko   QUOTE (pandaneko @ Jan 19 2012, 05:28 PM)...   Jan 27 2012, 09:52 AM
|- - pandaneko   QUOTE (pandaneko @ Jan 19 2012, 05:28 PM)...   Jan 28 2012, 08:27 AM
|- - pandaneko   QUOTE (pandaneko @ Jan 19 2012, 05:28 PM)...   Jan 28 2012, 08:58 AM
|- - pandaneko   QUOTE (pandaneko @ Jan 19 2012, 05:28 PM)...   Jan 29 2012, 09:53 AM
|- - pandaneko   QUOTE (pandaneko @ Jan 19 2012, 05:28 PM)...   Jan 30 2012, 09:09 AM
|- - pandaneko   QUOTE (pandaneko @ Jan 19 2012, 05:28 PM)...   Jan 31 2012, 10:19 AM
||- - pandaneko   QUOTE (pandaneko @ Jan 31 2012, 07:19 PM)...   Feb 14 2012, 09:13 AM
||- - pandaneko   I was not exactly sure where I should place this p...   Mar 10 2012, 08:26 AM
|- - pandaneko   QUOTE (pandaneko @ Jan 19 2012, 05:28 PM)...   Feb 1 2012, 09:59 AM
|- - pandaneko   QUOTE (pandaneko @ Jan 19 2012, 05:28 PM)...   Feb 2 2012, 09:42 AM
|- - pandaneko   QUOTE (pandaneko @ Jan 19 2012, 05:28 PM)...   Feb 3 2012, 09:44 AM
|- - pandaneko   QUOTE (pandaneko @ Jan 19 2012, 05:28 PM)...   Feb 5 2012, 09:07 AM
|- - pandaneko   QUOTE (pandaneko @ Jan 19 2012, 05:28 PM)...   Feb 6 2012, 09:54 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 25 2011, 09:36 AM
|- - pandaneko   QUOTE (pandaneko @ Dec 25 2011, 06:36 PM)...   Dec 26 2011, 10:09 AM
|- - pandaneko   QUOTE (pandaneko @ Dec 26 2011, 07:09 PM)...   Jan 13 2012, 10:13 AM
|- - pandaneko   QUOTE (pandaneko @ Jan 13 2012, 07:13 PM)...   Jan 14 2012, 10:15 AM
- - Astro0   I think that all of UMSF owes you an enormous debt...   Feb 6 2012, 11:23 AM
- - Paolo   Pandaneko probably knows but maybe other group mem...   Feb 6 2012, 12:57 PM
- - pandaneko   QUOTE (Paolo @ Feb 6 2012, 09:57 PM) Pand...   Feb 6 2012, 01:59 PM


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