Go Back   Team-BHP > Around the Corner > Shifting gears


Reply
 
Thread Tools Search this Thread
Old 12th November 2013, 12:05   #121
Senior - BHPian
 
Join Date: Oct 2012
Location: Delhi
Posts: 2,917
Thanked: 5,772 Times
Default Re: About Rocket Science & Engines

Good for them. Would be interesting to get a bit of insight what really happened. We reallly don't get any insights into what happened and how it was fixed and whether it will have any impact on the remaining part of the fllght, enhance risk or so for the remainder.

I can find very little technical details on this Indian Mars mission.

Read somewhere that more missions to Mars have failed than succeeded. Be that as it may, it is how you explore new worlds. Something fails, you learn from it and try and avoid it next time. But if anyting it does show how immature space exploration still is.

Jeroen
Jeroen is offline   Reply With Quote
Old 12th November 2013, 12:29   #122
Senior - BHPian
 
Gansan's Avatar
 
Join Date: May 2009
Location: Chennai
Posts: 3,417
Thanked: 860 Times
Default Re: About Rocket Science & Engines

It seems they were simultaneously testing the redundancies built in to the propulsion system, when the fuel flow to the engine stopped.

Source: http://en.wikipedia.org/wiki/Mars_Orbiter_Mission
Gansan is offline   Reply With Quote
Old 12th November 2013, 13:19   #123
BHPian
 
AlphaKilo's Avatar
 
Join Date: Nov 2010
Location: VOMM-EDDW-EDDM
Posts: 773
Thanked: 362 Times
Default

Thanks Gansan sir.

As mentioned in the above post, there was a testing of redundancy in the coils of flow control valve for the 440 N thrusters, when the glitch (not a failure as some news papers have been quoting) occured and the on-board FDIR (failure detection, isolation and recovery) system automatically kicked in and corrected the issue.

Lesson learnt: Primary and Redundant coils for 440N thrusters cannot be used in parallel, rather only sequentially.

Jeroen: Sad part is ISRO has a dedicated MOM page but even that seems to be a day old in terms of actual information. Hope they get a good IT team who are swift to update the info.

P.S: I am not associated with ISRO directly.

Quoting from the official website:

Quote:
In the fourth orbit-raising operation conducted this morning (Nov 11, 2013), the apogee (farthest point to Earth) of Mars Orbiter Spacecraft was raised from 71,623 km to 78,276 km by imparting an incremental velocity of 35 metres/second (as against 130 metres/second originally planned to raise apogee to about 100,000 [1 lakh] km). The spacecraft is in normal health. A supplementary orbit-raising operation is planned tomorrow (November 12, 2013) at 0500 hrs IST to raise the apogee to nearly 1 lakh km.

During the orbit-raising operations conducted since November 7, 2013, ISRO has been testing and exercising the autonomy functions progressively, that are essential for Trans-Mars Injection (TMI) and Mars Orbit Insertion (MOI).

During the first three orbit-raising operations, the prime and redundant chains of gyros, accelerometers, 22 Newton attitude control thrusters, attitude and orbit control electronics as well as the associated logics for their fault detection isolation, and reconfiguration have been exercised successfully. The prime and redundant star sensors have been functioning satisfactorily. The primary coil of the solenoid flow control valve was used successfully for the first three orbit-raising operations.

During the fourth orbit-raising operations held today (November 11, 2013), the redundancies built-in for the propulsion system were exercised, namely, (a) energising the primary and redundant coils of the solenoid flow control valve of 440 Newton Liquid Engine and (b) logic for thrust augmentation by the attitude control thrusters, when needed. However, when both primary and redundant coils were energised together, as one of the planned modes, the flow to the Liquid Engine stopped. The thrust level augmentation logic, as expected, came in and the operation continued using the attitude control thrusters. This sequence resulted in reduction of the incremental velocity.

While this parallel mode of operating the two coils is not possible for subsequent operations, they could be operated independently in sequence.
http://www.isro.gov.in/pressrelease/...spx?Nov11_2013

Last edited by Samurai : 12th November 2013 at 15:00. Reason: back-to-back post
AlphaKilo is offline   Reply With Quote
Old 15th November 2013, 16:32   #124
Senior - BHPian
 
Join Date: Oct 2012
Location: Delhi
Posts: 2,917
Thanked: 5,772 Times
Default Re: About Rocket Science & Engines

On a lighter note; not everybody is enthusiastic about this Mars mission.
Attached Images
 
Jeroen is offline   Reply With Quote
Old 18th November 2013, 13:40   #125
BHPian
 
AlphaKilo's Avatar
 
Join Date: Nov 2010
Location: VOMM-EDDW-EDDM
Posts: 773
Thanked: 362 Times
Default Re: About Rocket Science & Engines

Quote:
16-11-2013
  • The fifth orbit raising manoeuvre of Mars Orbiter Spacecraft, starting at 01:27 hrs(IST) on Nov 16, 2013, with a burn Time of 243.5 seconds has been successfully completed.The observed change in Apogee is from 118642km to 192874km.
http://isro.gov.in/mars/updates.aspx

Good to see this positive update! Hopefully the next one will also be glitch free before the free coast towards Mars.
AlphaKilo is offline   Reply With Quote
Old 19th November 2013, 00:50   #126
BHPian
 
AlphaKilo's Avatar
 
Join Date: Nov 2010
Location: VOMM-EDDW-EDDM
Posts: 773
Thanked: 362 Times
Default Re: About Rocket Science & Engines

http://www.nasa.gov/multimedia/nasat...l#.UopKkeIwLXh

Launch of MAVEN (live) - Pacific time 1328hrs on 18.11.2013. Launch picture perfect.

http://www.nasa.gov/mission_pages/ma.../#.UopoU8QjL1I

AlphaKilo is offline   Reply With Quote
Old 21st November 2013, 18:50   #127
BHPian
 
AlphaKilo's Avatar
 
Join Date: Nov 2010
Location: VOMM-EDDW-EDDM
Posts: 773
Thanked: 362 Times
Default Re: About Rocket Science & Engines

The first colour image from MOM:

http://isro.gov.in/pslv-c25/Imagegal...images/mom.png

Spatial resolution of 3.5km. One can also see some storm clouds over bay of Bengal and the coast of chennai.
AlphaKilo is offline   Reply With Quote
Old 30th June 2015, 15:13   #128
BHPian
 
Join Date: Jan 2012
Location: Phoenix, AZ
Posts: 252
Thanked: 153 Times
Default Re: About Rocket Science & Engines

My son and I keenly follow the Solar Impulse as the team attempts to circumnavigate the globe on a solar powered aircraft, you can track the progress online here http://www.solarimpulse.com/leg-8-from-Nagoya-to-Hawaii , I took a screenshot from the flightradar and I am so excited on the adventure that the team has undertaken, kudos to the team and the sponsors.
Attached Thumbnails
About Rocket Science & Engines-flightradar24.com-live-flight-tracker.png  

mazda4life is online now   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fiatís Multiair engine wins Popular Science award Klub Class The International Automotive Scene 4 25th November 2010 10:07
Easing Bangalore Traffic - Rocket Science? leodelg Street Experiences 239 20th November 2010 10:20
Is there an art/science of driving over different types of potholes? khan_sultan Technical Stuff 30 16th January 2010 12:34
Treat for car and science fanatics from Paris- rally cars, engine assembly line pics! sidindica Shifting gears 3 26th December 2008 23:11


All times are GMT +5.5. The time now is 07:11.

Copyright ©2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks