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

[ronatu]

Я не знаю постил ли кто нибудь то , что ракета не взорвалась , а была взорвана (подорвана-ликвидирована) после потери управления? :?:

[ronatu]

Dec 25, IANS:

For Vinod Kumar Srivastava, the range safety officer at ISRO rocket launch centre, it was a sad day - in a split second decision, he had to destruct the GSLV rocket that exploded after its launch here Saturday.  

He had to press the much-dreaded button - the rocket destruct button - as he found the rocket going off its path and breaking.

"We have the rocket's path and when it crosses the limits we had to destroy the rocket. We will study where the debris will fall when a rocket is blown up at a particular point in the air," Srivastava told IANS.

He said the rocket will not back-up and fall in civilian areas as it was moving forward at a fast pace.
.....

[Андрей Суворов]

А нафига? она же всё равно в воду падает?

[Старый]

Старый, сколько думаете займет на отладку ракеты? До запуска Chandrayaan-2 к Луне в 2013 году успеют?

Ну если быстро разберутся куда делись команды то значит до 13-го года успеют выявить и устранить ещё парочку причин.

[Петр Зайцев]

А у них вроде был случай когда она вернулась на сушу, или я что-то путаю?

[Старый]

Т.е. что они хотят сказать? Бортовой компьютер генерировал эти команды, но они не проходили?

Вобщем то они почти буквально так и сказали.
 Главное что на видеокадрах было видно что ракета потеряла управление.

[Старый]

Я не знаю постил ли кто нибудь то , что ракета не взорвалась , а была взорвана (подорвана-ликвидирована) после потери управления? :?:

Скорее всего сигнал на подрыв был послан уже после разрушения ракеты. На кадрах видно что она разрушается медленно и печально.

[Salo]

http://www.thehindu.com/news/national/article979370.ece

We will now review GSLV programme: ISRO[/size]
T. S. Subramanian

The disaster that struck the Geo-synchronous Satellite Launch Vehicle (GSLV-F06) on Saturday will not affect the transponder augmentation for the continuance of telecommunication, telecasting and weather forecasting services provided by the Indian National Satellite (INSAT) system, K. Radhakrishnan, Chairman, Indian Space Research Organisation (ISRO), said here.

The GSLV-F06 was to have put in orbit GSAT-5P with 36 transponders that would have boosted India's telecommunication, telecasting, tele-education, telemedicine and banking services. But the vehicle, after 50 seconds of flights, lost control, broke up into pieces and was destroyed in mid-flight.

Dr. Radhakrishnan said a series of communication satellites would be launched in the coming years to boost the country's communication and telecasting services. The GSAT-8, having 24 transponders, would be launched by the European Space Agency's Ariane rocket from French-Guyana in March-April 2011.

These would be followed by the launch of GSAT-10 and GSAT-9. Next to follow would be GSAT-12, a smaller communication satellite that would be put in orbit by the Polar Satellite Launch Vehicle from Sriharikota.

The ISRO Chairman, however, said: "we will now review the GSLV programme" since a GSLV of the same class was needed to put Chandrayaan-2 into orbit in 2013-14. While India would build the Chandrayaan-2 and the rover that would drive about on the Moon's soil, Russia would provide the lander, which would land the rover on the lunar soil. "The Russians are happy with the [Chandrayaan-2] programme so far," he said.

The ISRO would launch a Polar Satellite Launch Vehicle (PSLV-C16) from Sriharikota in the first week of February 2011. The rocket would put in orbit India's Resourcesat-2, Youthsat with payloads from Russia and India, and X-Sat from Singapore.

On the failure of the GSLV-F06, Dr. Radhakrishnan said its performance was normal for 50 seconds after the lift-off. "Soon afterwards, the vehicle's attitude was increasing, leading to heavier structural loads, higher angle of attack and breaking up of the vehicle."

The Range Safety Officer in the Mission Control Centre gave the 'destruct' command to the vehicle 63 seconds after the lift-off from its second launch pad and it was destroyed.

The vehicle lost control because there were indications that four connectors (chords) that take the signal to the first stage for controlling the rocket could have snapped. "What happened and why it happened, we have to find out. We will get into the details," Dr. Radhakrishnan said. He asserted that there was no problem with the GSLV's design. "It was only [due to] some accident that the connector snapped," he said. He was sure the problem would be overcome because "we learn from failures."

Not a major problem

Director of Vikram Sarabhai Space Centre in Thiruvananthapuram P.S. Veeraragahvan asserted that it was "not a major problem because the vehicle's design was not an issue. It was a problem of the connector snapping."

[Salo]

http://timesofindia.indiatimes.com/india/Technical-glitch-after-liftoff-GSLVs-gone-in-63-seconds/articleshow/7164870.cms

Technical glitch after liftoff, GSLV's gone in 63 seconds[/size]
Vivek Narayan, TNN, Dec 26, 2010, 01.19am IST

SRIHARIKOTA: India's ambitious space programme suffered a blow when the GSLV-F06 rocket had to be destroyed 63 seconds after lift-off from Sriharikota, 100km from Chennai. This was the second GSLV failure in less than nine months.

The GSLV-F06 had on board the GSAT-5P satellite that would have boosted the country's television broadcast and telemedicine facilities. Saturday's fizzle has cast a shadow over programmes such as Chandrayaan-2 and the manned space mission.

Isro chairman K Radhakrishnan attributed the failure to a glitch in the connection that was to take signals from onboard computers to the strap-on motors.

"I'm sorry to say that the GSLV-F06 mission has failed. The craft lifted off normally at 4.04pm. All the strap-on motors generated normal pressure before the solid core was ignited. The performance of the vehicle was normal up to 50 seconds. Soon the vehicle lost control and we had to detonate it at an altitude of 8km," Radhakrishnan told reporters.

As the computer commands ceased to reach the first stage, the range safety officer blew the rocket up, sending the debris plunging into the Bay of Bengal. The scattering white plume from the detonated launch vehicle was visible as far as Marina Beach in Chennai.

Isro will now conduct a postmortem. "What happened after 47 seconds has to be studied in detail," Radhakrishnan said.

The weather was fine and the lift-off perfect. There was applause and cheer as the majestic GSLV shot into the clear blue sky with a roar. But soon faces fell as mission control sensed trouble. After a minute, the worm on the scientists' monitors started plunging. There was dead silence. "A huge amount of work had gone into the project.

Earlier, we spotted a leak in the thermostat wall that helps reduce the temperature of liquid oxygen. The launch was postponed from last Monday because of this. The fault was rectified, but today another problem cropped up," a scientist added.

The monetary loss was pegged at Rs 325 crore — Rs 175 crore that went into the making of GSLV and Rs 150 crore for the satellite.

On losing the GSAT-5P satellite, which was carrying 36 transponders to augment communication systems, Radhakrishnan said the agency would need to find an alternative. The Isro chief at one point turned philosophical and said, "We've to learn from failures; such failures lead to success."

Isro has lined up four launches next year, including PSLV 17. "Chandrayaan-2 launch will take place in 2013-2014 in collaboration with Russia," he said, adding that Isro was conducting ground tests on the indigenous cryogenic engine.

GSLV, which can carry up to 2.5 tonnes of payload to a geosynchronus transfer orbit, is the designated vehicle for many future projects, including Chandrayaan and the manned mission. The previous GSLV launch on April 15 was a failure.

While the problem during the last launch was with the third stage indigenous cryogenic engine, this time trouble started in the first stage itself. On this launch, Isro used a Russian cryogenic engine.

Isro has had a troubled past with GSLV, with only two of the seven launches so far claiming total success. Though Isro claims that four launches had been successful, independent observers agree only with two, the rest being branded either failures or partial successes.

[Salo]

Вот на этой записи старта видно облачко на 43-44 секунде полета. как раз в районе разгонного блока.

Оно всегда образуется на максимальном скоростно напоре.

Был не прав: белое облачко (следствие эффекта Прандтля — Глоерта) возникает на околозвуковой скорости, а максимальный скоростной напор ракета проходит несколько позже.

[anik]

Ой!... :shock:

Heavier payload caused Indian rocket's failure: Expert
http://www.hindustantimes.com/Heavier-payload-caused-Indian-rocket-s-failure-Expert/Article1-643393.aspx

Instability introduced by excessive payload weight was most likely responsible for the failure of an Indian rocket's launch on Christmas day, an expert in the field and former scientist of the Indian Space Research Organization (ISRO) says. The scientist, with over two decades of experience with rocket motors, who did not want to be quoted has disputed ISRO's reasoning that the Rs 3 billion ($66 million) mission that was meant to launch an advanced communications satellite was brought down because some cables snapped during the ascent of the Geostationary Satellite Launch Vehicle (GSLV).

ISRO chairman K Radhakrishnan said at a post-launch press conference Dec 25 that cables carrying control signals from the on-board computer to the first stage got snapped and, as the uncontrolled vehicle started deviating from its flight path, it had to be destroyed.

Radhakrishnan, however, did not say why the cables snapped. ISRO's routine post-launch press release gave no details but only made a cryptic announcement that the "launch of GSLV-F06/GSAT-5P mission (was) not successful".

While admitting that the cable might have snapped, the unnamed source, however, disputes the claim that snapping of the connector cable to the control system actually triggered the tragedy. "The cable snapping was the effect (of the GSLV breaking) and not the cause of the mishap," he maintained.

"The cable joints cannot snap just like that," the scientist said. He said the connectors are locked so well they cannot snap unless the vehicle itself breaks.

According to the source, the GSLV most likely broke due to instability caused by the heavy payload - heavier than what the rocket had lifted in its previous missions.

At 2,310 kg, the GSAT-5P communication satellite carried in the ill-fated mission was the heaviest payload ever lifted by a GSLV. It was 180 kg heavier than the INSAT-4CR launched successfully by a GSLV in 2007, 400-kg heavier than Edusat launched in 2003 and about 800 kg heavier than GSAT-1 launched in 2001.

According to the source, the following sequence of events might have taken place leading to the Christmas day disaster:

* The excessive weight of the payload made the rocket tilt due to aerodynamic forces.

* The control signals to correct the attitude must have gone to the first stage gymbal system as expected normally.

* But the control system failed to arrest the tilting as it was beyond the limit (plus or minus 4 degrees) of controllability.

* The vehicle broke, as it was not capable of taking the higher structural load brought about by tilting beyond the limit.

The source said ISRO scientists, in simulated tests, must have definitely looked at vehicle stability after increasing the payload "but it is possible that something went wrong".

According to the source, the fact that ISRO had so far never encountered problems with the first two stages of GSLV further strengthens his hypothesis that the excess payload carried by the GSLV triggered the series of events leading to the rocket's premature death.

[U_A]

Ой!... :shock:

Heavier payload caused Indian rocket's failure: Expert
http://www.hindustantimes.com/Heavier-payload-caused-Indian-rocket-s-failure-Expert/Article1-643393.aspx

Вот это ништячок! Новое в космических технологиях в 2010 году:

а) неумение считать заправку кислородом

б) неумение считать массу ПН

 

[U_A]

Я не знаю постил ли кто нибудь то , что ракета не взорвалась , а была взорвана (подорвана-ликвидирована) после потери управления? :?:

Скорее всего сигнал на подрыв был послан уже после разрушения ракеты. На кадрах видно что она разрушается медленно и печально.

Если система управления была, как пишут, на верхней ступени и она потеряла связь с активной первой ступенью, то физически сигнал на подрыв не могла бы выдать

[Старый]

Если система управления была, как пишут, на верхней ступени и она потеряла связь с активной первой ступенью, то физически сигнал на подрыв не могла бы выдать

Подозреваю что АПО на каждой ступени своя и не зависит от системы управления.

[U_A]

Если система управления была, как пишут, на верхней ступени и она потеряла связь с активной первой ступенью, то физически сигнал на подрыв не могла бы выдать

Подозреваю что АПО на каждой ступени своя и не зависит от системы управления.

КОРД?  

У меня сомнения, честно говоря, потому что на видео четкий развал пакета с хаотическим движением частей

[Старый]

КОРД?  

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

У меня сомнения, честно говоря, потому что на видео четкий развал пакета с хаотическим движением частей

Но там некоторые части потом взрываются. Если они не разрушились сразу то с чего бы им взорваться потом? Может сигнал дошёл.

[Salo]

http://timesofindia.indiatimes.com/india/Disaster-leaves-Isro-with-1-cryo-engine/articleshow/7169828.cms

Disaster leaves Isro with 1 cryo engine[/size]
Arun Ram, TNN, Dec 27, 2010, 03.08am IST

CHENNAI: Isro is staring at a crisis: it is left with just one Russia-made cryogenic engine and its indigenous version is far from ready. The launch of communication satellites weighing more than 2 tonnes into a geosynchronous transfer orbit, besides India's ambitious space programmes such as Chandrayaan-2 and the manned mission, need Geosynchronous Satellite Launch Vehicles ( GSLV) powered partly by cryogenic engines.

The cryogenic engine that went up in flames with GSLV-F06 on Saturday was the sixth of the seven such engines the country had procured from Russia. Post-Pokhran-II, the US had armtwisted Russia to deny the engine to India. Isro tried the indigenous cryogenic engine for the GSLV-D3 launch on April 15, 2010, which was a failure. The engine has gone back to Isro's workshops for ground tests and there is no definite word on when the improved version would be ready.

"Our stockpile of cryogenic engine has been reduced to one and there are five heavy satellites to be launched in 2011 to augment our telecommunications and broadcasting constellation in space," said a space scientist.

[Salo]

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

[U_A]

КОРД?  

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

У меня сомнения, честно говоря, потому что на видео четкий развал пакета с хаотическим движением частей

Но там некоторые части потом взрываются. Если они не разрушились сразу то с чего бы им взорваться потом? Может сигнал дошёл.

http://en.wikipedia.org/wiki/GSLV

Если я правильно понял, то там компоненты самовозгорающиеся на бустере, который как раз попадает во время взрыва

[Bell]

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: