IPB

Welcome Guest ( Log In | Register )

Nozomi in perspective, Revisiting the causes of failure
pandaneko
post Oct 23 2011, 09:12 AM
Post #1


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
Go to the top of the page
 
+Quote Post
 
Start new topic
Replies
pandaneko
post Oct 27 2011, 09:09 AM
Post #2


Member
***

Group: Members
Posts: 817
Joined: 17-April 10
From: Kamakura, Japan
Member No.: 5323



QUOTE (pandaneko @ Oct 23 2011, 06:12 PM) *


above for ease of reference


(3) Nozomi's design philosophy

Nozomi was designed to be launched in 1997 and its development and manufacturing spanned the four years starting in 1993. Its development was based on the following points.

① It should carry world first class instruments which can expect maximum returns.

② In order to maximise its scientific returns Nozomi should be designed to be proactively international.

③ Most reliable engineering technologies should be employed to secure its mission.

④ In manufacturing the probe only reliable and trustworthy parts and instruments should be procured.

⑤ Since the launching rocket is to be an M-V type the maximum weight of the probe should be kept within 530kg (later increased to 540kg thanks to the improvement of the rocket capability).

With respect to the points 1 and 2 above we are pleased to note that overseas groups were providing 4 instruments, ultrahigh stable resonator, image compression chips with world top class obervational capabilities.

In addition, all the data obtained by its mission was, ultimately, to be made available to all scientists across the world.

About the point 3 above, we adopted the dual liquid propulsion system because we concluded that aerocapture (note 3) and electric propulsion system (note 4) were still technically unreliable.

About the point 4 above, the valves that were right for the Nozomi specs were not produced by domestic manufacturers. This meant that we would have to use overseas parts with restrictions on the provision of technical indformation. For this reason, we decided that we should be sufficiently careful in order to ensure that they met our requirements in terms of reliability through quality assurance tests and related tests and inspections.

About the point 5 above, we reflected this weight limitation in our probe design (to be discussed later) and reduction of the weight of the probe was concretely put into action.


(Note 3) Aerocapture

This is a technique by which atmospheric pressure resistance is used to reduce the velocity of the probe for orbit insertion. This will allow a very large amount of reduction in fuel consumption. However, in the case of Mars the precision required for deviation from an optimum height is about 5km and is quite chaleenging. In addition, the target height will also vary according to the state of the Mars atmosphere at the time of velocity reduction and also the probe must be protected against heat.

(Note 4) Electrical propulsion

Artificially produced plasma is accelerated by high voltage and released into space for propulsion

End of page 4

(I am trying to be as accurate as possible in my translation. However, if anybody has any questions or require further clarification I will be very pleased to re-translate the bits in question. P)

Go to the top of the page
 
+Quote Post
PaulM
post Oct 27 2011, 11:52 AM
Post #3


Member
***

Group: Members
Posts: 206
Joined: 15-August 07
From: Shrewsbury, Shropshire
Member No.: 3233



I understand that the reason for the final failure of the Nozomi mission was as follows:

"In April 2002, on its way to Mars, NOZOMI had experienced a very strong solar energetic proton event associated with a strong solar flare. This caused a short circuit in one of the subsystems and a loss of telemetry signal, which made the Mars orbit insertion impossible."

http://www.spaceref.com/news/viewpr.html?pid=13182

I also understand that Spirit and Opportunity survived the same solar flare without suffering any problems. I have always presumed that the reason for this was either that Japan did not have access to the same space certified components that JPL had access to or that Japan did not have JPL's understanding of designing space hardware in a radiation tolerant way.
Go to the top of the page
 
+Quote Post

Posts in this topic
- 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
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 12 2011, 09:38 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 13 2011, 09:04 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 13 2011, 09:14 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 14 2011, 09:04 AM
- - 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
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 18 2011, 09:25 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 19 2011, 09:46 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 20 2011, 09:22 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 21 2011, 09:35 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 22 2011, 09:12 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 23 2011, 09:29 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 24 2011, 09:39 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 25 2011, 09:41 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 26 2011, 09:42 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 27 2011, 09:23 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 28 2011, 08:44 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 29 2011, 09:05 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Nov 30 2011, 09:04 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 2 2011, 09:26 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 3 2011, 10:00 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 4 2011, 09:06 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 5 2011, 09:51 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 6 2011, 12:09 PM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 7 2011, 08:42 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 8 2011, 09:41 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 9 2011, 10:08 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 11 2011, 09:57 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 12 2011, 09:51 AM
- - 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
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 19 2011, 09:29 AM
- - pandaneko   QUOTE (pandaneko @ Oct 23 2011, 06:12 PM)...   Dec 20 2011, 11:43 AM
- - 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


Reply to this topicStart new topic

 



RSS Lo-Fi Version Time is now: 31st October 2024 - 11:30 PM
RULES AND GUIDELINES
Please read the Forum Rules and Guidelines before posting.

IMAGE COPYRIGHT
Images posted on UnmannedSpaceflight.com may be copyrighted. Do not reproduce without permission. Read here for further information on space images and copyright.

OPINIONS AND MODERATION
Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators.
SUPPORT THE FORUM
Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member.