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Help Snapping of connectors caused GSLV failure: ISRO
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BANGALORE: A Preliminary Failure Analysis Team constituted to study the flight data of GSLV-F06, which crashed seconds after its launch on December 25, said that the primary cause of the failure was “the untimely and inadvertent” snapping of a group of 10 connectors located at the base of the Russian Cryogenic stage.

The premature snapping of these connectors stopped the flow of control commands to the core First Stage control electronics, leading to the loss of control and breakup of the vehicle, said a press statement from the Indian Space Research Organisation (ISRO) on Friday. The precise cause of the snapping of this set of connectors — whether due to external forces such as vibration or dynamic pressure — is to be analysed further, the statement added.

Command signals

Some of these connectors carried command signals from the onboard computer located in the Equipment Bay (near the top of the vehicle) to the control electronics of the four L40 strap-ons of the First Stage. These connectors were intended to be separated only during a separation command at 292 seconds after lift-off.

The performance of the GSLV-F06 flight (with GSAT-5P Satellite onboard) was normal up to 47.5 seconds from lift-off. The events leading to the failure began at 47.8 seconds after lift-off. Soon, the vehicle started developing “larger errors” in its orientation “leading to build-up of higher angle of attack and higher structural loads,” according to ISRO. The vehicle broke up at 53.8 seconds from lift-off. A “destruct” command was issued from the ground at 64 seconds after lift-off as per the Range safety norms.

The Preliminary Failure Analysis Team was chaired by the former ISRO Chairman, G. Madhavan Nair, and analysed the flight data along with members of the Launch Authorisation Board, the Mission Readiness Review Committee as well as senior functionaries of the GSLV Project and experts.

The ISRO has now constituted a Failure Analysis Committee to carry out an in-depth analysis of the flight data of GSLV-F06 and data from the previous six flights of GSLV. The committee will establish reasons for the failure of GSLV-F06 and recommend corrective actions on the GSLV vehicle, including the remaining solitary Russian Cryogenic engine. The Failure Analysis Committee has 11 experts drawn from within ISRO and outside.

The ISRO has also constituted a Programme Review and Strategy Committee to look into the future of the GSLV Programme and the launches of the INSAT/GSAT Series, INSAT-3D and Chandrayaan-2. It will work towards the operationalisation of the indigenous Cryogenic Stage and come up with a strategy for meeting the demands of communication transponders in the immediate future, the statement said. This seven-member committee will be headed by K. Kasturirangan, former ISRO chairman.

These two Committees have been requested to submit their reports by the end of January 2011. The reports will be presented to eminent scientists and engineers, including A.P.J. Abdul Kalam, M.G.K. Menon, Yash Pal, U.R. Rao, K. Kasturirangan, Mr. Madhavan Nair, R. Chidambaram, and R. Narasimha.

http://www.hindu.com/2011/01/01/stories/...991800.htm
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#2
German-made connectors snapped: ISRO

Chennai:The 10 connectors that snapped prematurely destroying the Indian rocket - geosynchronous satellite launch vehicle (GSLV) - Dec 25 were imported from Germany, an Indian Space Research Organisation (ISRO) official said on Wednesday.

Speaking to reporters on the sidelines of the Space Summit session at the 98th Indian Science Congress, T.K. Alex, Director of the ISRO Satellite Centre, said: "The connectors are German made."

On Christmas day, a GSLV rocket weighing 418 tonnes and costing 175 crore ($38 million) and carrying an advanced communication satellite GSAT-5P veered off its flight path and disintegrated within a minute after lift off from Sriharikota in Andhra Pradesh.

According to ISRO officials, commands from the rocket's on-board computers - located atop other equipments including the three stages/engines - are relayed through wires.

"As the three stages would separate after their work one after another, it is impossible to have long wires connecting the computers at the top and the stages located below. Hence, we have connectors, sort of plugs and sockets, to relay the commands and peel off smoothly when the stages separate," an ISRO official told IANS.

According to ISRO, 10 connectors located below the Russian made cryogenic engine snapped leading to the rocket's failure. Asked if it was a failure of the connectors, Alex said: "A committee has been set up to study the reasons for the connectors to snap. Even the back up connectors snapped."

In July last year, an ISRO official said the failure of imported component for power systems was the reason for its satellites failing.

ISRO has lost two of its satellites - Chandrayaan in 2009 and INSAT-2D in 1997 - and INSAT-4B partially due to glitches in power supply systems.

ISRO, which is trying to get a foothold in the global communication satellite building market, suffered a setback as the W2M satellite built alongwith EADS Astrium for Eutelsat Communcations failed last year.

The Indian space agency imports the solar cells to make the solar panels that supply power to the satellite.
Siliconindia News
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Airtel Digital HD Recorder / Kerala Vision Digital TV
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