Quote from: pradeep on 12/31/2010 11:05 amISRO has posted the preliminary findings report on the GSLV failure today.Report: #GSLV Preliminary Failure Report is out - http://isro.gov.in/pressrelease/scripts/pressreleasein.aspx?Dec31_2010Quote from: GSLV Preliminary Failure ReportThe exact cause of snapping of the set of connectors, whether due to external forces like vibration, dynamic pressure is to be analysed further and pin-pointed.So apparently no clues yet on the cause(s) of the famous connectors snapping..
ISRO has posted the preliminary findings report on the GSLV failure today.Report: #GSLV Preliminary Failure Report is out - http://isro.gov.in/pressrelease/scripts/pressreleasein.aspx?Dec31_2010
The exact cause of snapping of the set of connectors, whether due to external forces like vibration, dynamic pressure is to be analysed further and pin-pointed.
Quote from: input~2 on 12/31/2010 12:24 pmQuote from: pradeep on 12/31/2010 11:05 amISRO has posted the preliminary findings report on the GSLV failure today.Report: #GSLV Preliminary Failure Report is out - http://isro.gov.in/pressrelease/scripts/pressreleasein.aspx?Dec31_2010Quote from: GSLV Preliminary Failure ReportThe exact cause of snapping of the set of connectors, whether due to external forces like vibration, dynamic pressure is to be analysed further and pin-pointed.So apparently no clues yet on the cause(s) of the famous connectors snapping..The report says: "These connectors are intended to be separated only on issue of a separation command at 292 seconds after lift-off. The premature snapping of these connectors has led to stoppage of continuous flow of control commands to the First Stage control electronics, consequently leading to loss of control and break-up of the vehicle." So how are these connectors separated at 292 seconds? Is this "snapping" actually a separation process that usually only happens at staging, but that somehow happened prematurely? The phrase "premature snapping" seems to indicate that "snapping" might be a standard procedure when it is not "premature". - Ed Kyle
Snapping of connectors caused GSLV failure: ISROStaff ReporterProgramme Review and Strategy Committee set up to look into the future of the programmeThe precise cause of the snapping of conductors is to be analysed furtherFailure analysis panel will recommend corrective action on GSLV vehicleBANGALORE: 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 fact that all of those connectors are located at the base of the cryogenic stage can't be a coincidence.
These connectors are intended to be separated only on issue of a separation command at 292 seconds after lift-off.
Exactly how does stage separation occur? Through explosive bolts?Premature stage separation is a specific type of structural failure which seems to have more possible causes associated with it than other types.Whether the connectors failed due to premature stage separation, or whether premature stage separation occurred due to connector failure, there should be some way to discern cause from effect.1. How is stage separation recorded/registered? Hopefully, there would be something in the telemetry logs which shows whether the stage separated an instant before the control signals were lost, or whether the control signals were lost before the stage separation occurred.2. What are the main ways through which aerodynamic loads and turbulence are detected - purely through the inertial guidance system?If so, then the frequency and magnitude of correction commands would be an indicator to the buildup of such forces.3.But how are sheer forces detected or monitored?
The report says: "These connectors are intended to be separated only on issue of a separation command at 292 seconds after lift-off. The premature snapping of these connectors has led to stoppage of continuous flow of control commands to the First Stage control electronics, consequently leading to loss of control and break-up of the vehicle." So how are these connectors separated at 292 seconds? Is this "snapping" actually a separation process that usually only happens at staging, but that somehow happened prematurely? The phrase "premature snapping" seems to indicate that "snapping" might be a standard procedure when it is not "premature". - Ed Kyle
Exactly how does stage separation occur? Through explosive bolts?
Looks to me the rocket was not properly balanced.......then the snaps occurred. Since the rocket was stretched, it seems to be nose-heavy,thus breaking apart at maximum dynamic pressures.
Meanwhile, ISRO to get supercomputer upgrade:http://www.hpcwire.com/news/New-Half-Petaflop-Super-Will-Boost-Indias-Space-Program-112828474.htmlhttp://www.livemint.com/2011/01/04030242/Wipro-building-India8217s-f.html?atype=tp