GSAT-5P \\ GSLV-F06 - 25.12.10 13:34 ДМВ - авария

[U_A]

GSAT-5P, GSLV-F06 were not insured[/size]

Угарный перевод гугля Как говорится, пунктуация автора сохранена:

GSLV-F06 пошел курить, потому что в команде из своего электронного мозга на первом этапе не вернуться домой. Это произошло потому, что четырьмя разъемами, которые стежка до проводов передачи сигнала, ценятся открытые и проводов получил отрезал.

Короче, GSLV-F06 пошел курить, потому что ценные цветметные провода кто-то отрезал  :lol:

Вот кстати, спутник был иншуред?

[Bell]

Нот иншуред он был
Статья как раз об этом

[Salo]

http://www.hindu.com/2010/12/27/stories/2010122756631000.htm

GSLV failures fuel disappointment and anxiety[/size]

T.S. Subramanian

Can ISRO meet its schedule of Chandrayaan-2 and human space flight programmes?

GSLV mission on December 25 failed because of "a very, very trivial issue"

ISRO hardpressed for transponders to cater for India's telecom, television requirements

CHENNAI: While disappointment haunts the Indian Space Research Organisation (ISRO) about the two successive failures of the Geo-synchronous Satellite Launch Vehicle (GSLV) missions, there is fear whether the failures will affect the schedule of ISRO's Chandrayaan-2 and the human space flight programmes.

The fear is fuelled by the fact that it is GSLV-Mark II with an indigenous cryogenic engine that will put Chandrayaan-2 in orbit in 2013-14. The upgraded GSLV-Mark III, which is under development, will carry two Indians into space in low earth orbit around 2016. Besides, ISRO is hard-pressed for transponders to cater to India's booming telecommunication, telecasting and radio broadcasting requirements.

While the GSLV-F06, with the GSAT-5P on board failed on December 25, 2010, the GSLV-D3, with indigenous cryogenic engine, failed on April 15, 2010. Including these two failures, four out of a total of seven GSLV missions have failed since 2001. The GSLV is a three-stage vehicle. The first stage uses solid propellants with four strap-on booster motors. The second stage uses liquid propellants. The third topmost stage uses cryogenic propellants. The GSLV is 51 metres long.

There is disappointment among ISRO's rocket technologists that the GSLV mission on December 25 failed because of "a very, very trivial issue." They said it failed because the signal from the equipment bay, which houses the electronic brain of the vehicle and is housed atop the rocket, to control the vehicle, did not reach the first stage. A bunch of wires, running to more than 45 metres, convey these signals from the equipment bay and the wires terminate in the three stages of the vehicle. Since these wires are so long, they are connected by devices called connectors, which are akin to plugs and sockets. It is these connectors that hold these wires in place.

An authoritative ISRO rocket technologist said four such connectors came loose or were prised open because of "some disturbance" in the flight and so the wires, which convey the signal for controlling the rocket, lost their continuity. "If some connectors open up, the wires will not have continuity. It is a very, very trivial issue. So the command for controlling the rocket from the equipment bay did not reach the first stage. An uncontrolled rocket will fail. That is what happened. We are in the investigation mode," he said.

"Simple problem"

Another top rocket engineer also said the connectors coming loose was "a simple problem that did the mission in" and that the rocket's design was basically sound.

The previous GSLV mission in April 2010 failed because of the malfunctioning of the fuel booster turbo pump in the indigenous cryogenic stage.

While the Polar Satellite Launch Vehicle (PSLV-XL), which is much smaller than the GSLV-Mark II, put Chandrayaan-1 in orbit in October 2008, ISRO needs a GSLV to put Chandrayaan-2 in orbit because Chandrayaan-2 is much heavier. It will have a lander and a rover. The rover will drive about on the lunar soil, pick up samples with a robotic arm and do in situ analysis.

"Not a major setback"

Informed ISRO rocket engineers are, however, confident that the schedules can be met. The Chandrayaan-2 mission is more than three years away and a series of ground tests of the indigenous cryogenic engine can be done at Mahendragiri in Tamil Nadu to re-qualify the engine. "You are talking of a programme which is three years away. The schedule can be met. Besides, this particular issue [of connectors snapping] is not a major setback," an ISRO engineer explained. (The latest GSLV mission carried a Russian cryogenic engine).

The GSLV-Mark III, which will put two Indian astronauts in space, should be man-rated vehicles. That is, they should be reliable enough to carry humans into space. If the mission carrying the humans were to fail, the prestige of the nation would be at stake, ISRO engineers said.

What worries ISRO is that it is hard-pressed for transponders to meet the booming requirements of India in the telecommunication, television, radio broadcasting and banking services sectors. The failures of the December 25 and the April 15 GSLV missions to put the GSAT-5P and the GSAT-4 in orbit have aggravated the situation.

ISRO Chairman K. Radhakrishnan told journalists at Sriharikota on December 25 that a series of GSATs would be put in orbit in 2011 and 2012, which would meet the country's requirements. Besides, transponders from foreign satellites could be leased.

[Salo]

http://www.deccanchronicle.com/hyderabad/gsat-5p-failure-not-hit-foreign-satellite-launches-985

"We suspect that a connector which takes signal down snapped" he said pointing to a possible snag on strap on motor in the first stage. Reacting to a question on GSLV failure affecting the business of launching foreign satellites, he maintained that it will not have much of an impact while pointing to their success with PSLV. He said Chandrayaan II project will be launched in 2013 or 2014.

"We have brought seven cryogenic engines from Russia and used six so far and have one more. We have taken sanction for redesign the core element of GSLV in 2011 first part. Our current plan for 2011 to 2012 we would like to go through ground tests related design and configuration of GSLV before next flight," Dr Radhakrishnan added.

[U_A]

Нот иншуред он был
Статья как раз об этом

Ну тогда бы я на месте Давыдова потирал руки

[U_A]

КОРД?  

Нет, радиокомандная. В цивилизованных странах аварийный подрыв радиокомандный. И здесь вроде говорили что была послана команда.

Индию вычеркиваем из цивилизованных. Проводок

[Bell]

Нот иншуред он был
Статья как раз об этом

Ну тогда бы я на месте Давыдова потирал руки

У Давыдова нет закона страховать свои спутники только в госкомпании.

[U_A]

Нот иншуред он был
Статья как раз об этом

Ну тогда бы я на месте Давыдова потирал руки

У Давыдова нет закона страховать свои спутники только в госкомпании.

Я в другой ветке уже сказал, что он не может страховать спутники, потому что они УЖЕ предоплачены

[Старый]

КОРД?  

Нет, радиокомандная. В цивилизованных странах аварийный подрыв радиокомандный. И здесь вроде говорили что была послана команда.

Индию вычеркиваем из цивилизованных. Проводок

Проводок это система управления. Система АПО - радиосигнал.

[Bell]

Мда, хотел бы я посмотреть на АПО по проводам  :lol:

[X]

Мда, хотел бы я посмотреть на АПО по проводам  :lol:

ПТУРС :wink:

[Salo]

Более подробное видео аварии:

http://www.youtube.com/watch?v=oH-0OH0MI2Y&feature=player_embedded

[Salo]

Развитие аварии:








Явно подломилась третья ступень и в последствии взорвалась (облако слева на нижнем снимке).

[Salo]

http://www.sify.com/news/snapping-of-connectors-caused-launch-failure-scientist-news-national-km3lGaeaeaf.html

Snapping of connectors caused launch failure: Scientist[/size]

Chennai: The snapping of around 10 connectors between the second and third stage of the Indian rocket GSLV led to the failure of the communication satellite mission, according to an Indian scientist.

The Indian Space Research Organisation (ISRO) scientist denied that Saturday's failure was caused by the 90-kg increase in the satellite's weight or the marginal increase in the overall rocket's weight.

Speaking on the condition of anonymity as he was not authorised to speak to the media, the official said: "It seems some heavy load had come at the place where the connectors were located, between the third and second stage, for them to snap. A detailed study will throw more light on the matter."

According to ISRO officials, commands from the on-board computers to 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 inadvisable 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," the official said.

"Connectors in a rocket are akin to the vertebrae of a human being. Breaking of connectors is like cutting the vertebrae," added R.V. Perumal, a retired ISRO rocket scientist.

"We do not find any pattern in GSLV failures as the reasons are different," another official said.

On Christmas day, a GSLV rocket (weight 418 tonnes, cost Rs.175 crore) carrying advanced communication satellite GSAT-5P (weight 2,310 kg, cost Rs.150 crore) veered off its flight path and began disintegrating within one minute after lift-off from Sriharikota in Andhra Pradesh.

Speaking about the disaster, ISRO chairman K. Radhakrishnan had said that control over the rocket was lost 47 seconds after lift-off as the four connectors to the strap-on motors got snapped.

Recalling the flight sequence, an ISRO source said: "The rocket lifted off smoothly and the flight was normal till the 47th second.

"Problems stared between the 47th and 50th seconds. A total of 10 connectors located between the second and third/cryogenic stage separated, leading to the rocket going out of control."

He said the cryogenic engine, the heat shield capsule-housing the equipment bay and the satellite broke away first. Then the strap-on motors part of the first stage started breaking.

In order to avoid the remaining rocket turning rogue, Range Safety Officer Vinod Kumar Srivastava blew the rocket mid-air.

A retired ISRO official had told IANS that the cable snapping was the effect of the GSLV breaking. He contended that the GSLV most likely broke due to instability caused by the heavy payload.

Dismissing the contention, an ISRO official said: "The increase in GSAT-5P's weight is just 90 kg as compared to the GSLV rocket that carried the GSAT-4, weighing 2,220 kg, in April. Such marginal increase in weight will make no difference."

He discounted the possibility of the rocket becoming unstable because of the two-tonne increase in its overall weight as compared to the April GSLV rocket that weighed 416 tonnes.

"On Saturday, the rocket would have burned around 100 tonnes of first stage fuel by the time the problem started. So a mere addition of two tonnes to the rocket's weight would not make it unstable," he added.

Second rocket failure disappoints Indian space scientists

"Further, when the rocket configuration changes, necessary calibrations will be carried out in the rocket's navigational systems, control dynamics and aerodynamics to make the mission successful," Perumal said.

ISRO officials say the rocket's capability will be improved continuously so as to arrive at its optimum capability.

The GSLV rocket that flew in April 2010, powered by an indigenous cryogenic engine, stood 50 metres tall and had a lift-off weight of 416 tonnes. That mission failed as there was a problem in the cryogenic stage built by the ISRO.

The standard configuration for GSLV is a height of 49 metres and 414 tonnes in weight at lift-off whereas the rocket that went up in flames was taller by two metres and heavier by four tonnes.

[Tiger]

Чё-то они путаются в показаниях. Какие у них, всё-таки, коннекторы отвалились - четыре к боковым блокам или десять между второй и третьей ступенями?

В тексте оба варианта сразу присутствуют.

[LRV_75]

Видимо это коннекторы в верхней части второй ступени рядом с  гарготом на третьей ступени

[Tiger]

Видимо это коннекторы в верхней части второй ступени рядом с  гарготом на третьей ступени

А причём тут тогда боковухи?

[Старый]

А причём тут тогда боковухи?

А на боковухи сигнал не дошёл.

[Tiger]

Ну и где же безобразие тогда началось?..  :roll:

[Старый]

Ну и где же безобразие тогда началось?..  :roll:

Гдето в коннекторе. Наверно между 2 и 3 ступенями.