Cygnus Orb-3 (CRS3) - Antares-130 - MARS LP-0A (о.Уоллопс) - 28.10.2014

[Lanista]

Это как так? Там помимо взрыва было еще падение с высоты. или это кубсат типа бетонный куб?

[anik]

Значит мы так и не услышим правду, которая была в "Рейтере"...

Jeff Foust @jeff_foust
Grabe: failure linked to a bearing problem in turbopump in one of the rocket's AJ26 engines. #31ss
Grabe: Orbital ATK will be submitting final report to FAA in days on Antares launch failure last October. #31ss

[anik]

Чрезмерный износ подшипников...

Turbopump Flaw Blamed for Antares Launch Failure
http://spacenews.com/turbopump-flaw-blamed-for-antares-launch-failure/

COLORADO SPRINGS, Colo. — A report on the October failure of an Antares launch vehicle is due to be delivered to the Federal Aviation Administration within days, with a problem in an engine turbopump identified as the most likely cause of the failure, an Orbital ATK executive said April 14.
In a panel session during the 31st Space Symposium here, Ronald Grabe, president of the company's flight systems group, said that an Orbital-led investigation into the Oct. 28 launch failure would submit a report to the Federal Aviation Administration "within days."
Grabe said the investigation concluded there was "excessive bearing wear" in the turbopump of one of the two AJ-26 engines in the Antares stage. That bearing wear causes rotating and stationary parts of the turbopump to come into contact, which in turn caused the failure of the turbopump and the engine itself.
Orbital — under the oversight of the FAA — is leading the investigation into the failure, which destroyed a Cygnus cargo spacecraft bound for the International Space Station. NASA is carrying out its own independent review of the accident, Grabe said, and Aerojet Rocketdyne, which provided the AJ-26 engines, is carrying out a separate investigation.

[Apollo13]

anik пишет:
Значит мы так и не услышим правду, которая была в "Рейтере"...

"Власти скрывают!"

[anik]

Apollo13 пишет:
"Власти скрывают!"

От вас что ли? Ну это и так всем известно.

[Apollo13]

anik пишет:

Apollo13 пишет:
"Власти скрывают!"

От вас что ли? Ну это и так всем известно.

Нет конечно. Я-то верю официальной версии

[anik]

Apollo13 пишет:
Я-то верю официальной версии  

И какой же из них вы верите? Их две.

Orbital, Aerojet Rocketdyne Disagree on Cause of Antares Explosion
http://www.parabolicarc.com/2015/04/15/orbital-aerojet-rocketdyne-disagree-antares-explosion/

After the explosion of an Antares rocket in October, NASA left the investigation in the hands of the company's that bands of the company that built and launched the rocket, Orbital Sciences Corporation (now Orbital ATK). Yesterday, we got the first official word on what that investigation has found. And it's very confusing.
Orbital ATK Executive Vice President Ronald Grabe said during the 31st Space Symposium that the failure was caused by excessive wear in the bearings of a turbo pump for one of the two first-stage AJ-26 engines supplied by Aerojet Rocketdyne.
Grabe said the company's report would be turned over to the Federal Aviation Administration within days.
So, mystery solved. Responsible party identified. Orbital not at fault.
Not so fast, says Aerojet Rocketdyne's parent company.
GenCorp spokesman Glenn Mahone said the company's independent investigation would be completed in about three weeks, but the bulk of the work had been done. He said Orbital's statement was "inaccurate and could be misleading." He said GenCorp's investigation had also identified excessive wear of the bearings as the direct cause of the explosion that destroyed the rocket, but further research revealed that the bearings likely wore out due to "foreign object debris" in the engine.
The debris (known as FOD) would probably have been sucked in from one of the fuel tanks, which are built by a Ukrainian company. It was Orbital's responsibility to make sure no debris was present in the tanks before mating.
Meanwhile, NASA is conducting its own assessment of the launch failure, which destroyed an agency-funded Cygnus spacecraft that was headed for the International Space Station. NASA has no plans to release that report publicly.
Orbital has decided not to continue using AJ-26 engines, which 40-year old refurbished NK-33 motors left over from the Soviet Union's manned lunar program. Instead, they are switching over to new Russian-built RD-181 engines.
Even with the engine change, the inability of the parties to identify a root cause is disturbing because it's happened before. In 2009, Orbital launched NASA's $278 million Orbiting Carbon Observatory into the ocean after the payload shroud of its Taurus XL booster failed to separate.
Two years later, Orbital did it again, destroying NASA's $424 million Glory satellite when the payload shroud again failed to separate on the Taurus XL launch vehicle. In between the flights, Orbital said it had identified and fixed problem, but engineers did not appear to have identified the root cause.
One really has to question the decision to allow Orbital to investigate itself on the Antares failure. And why is NASA keeping its own inquiry secret?
I don't know if that is stipulated in NASA's commercial cargo agreement Orbital, but it raises questions about whether the public will get a clear answer as to what caused the failure. NASA funded the mission and paid Orbital the majority of the contracted amount despite the fact Cygnus go nowhere near the space station.

[triage]

добавлю ссылку про те две версии... тут дата отчета: возможно на следующей недели предоставят в FAA

http://www.reuters.com/article/2015/04/16/us-orbitalatk-gencorp-faa-idUSKBN0N701O20150416
Wed Apr 15, 2015 9:22pm EDT
U.S. FAA says plans careful look at Orbital report on rocket blast
(Reuters) - The U.S. Federal Aviation Administration will carefully review an Orbital ATK-led investigation into an October rocket explosion to ensure that all possible causes were properly considered, a top FAA official said Wednesday.
....
He said Orbital was well-placed to lead the investigation since it designed, built and operated the rocket, and GenCorp had also provided input into the investigation.

The Orbital-led accident investigation board included officials from NASA and the FAA, as well as a non-voting representative from GenCorp.

"However this turns out, it is going to be very important to both companies and there may be some disagreement," Nield said. "We'll certainly look at this carefully to make sure that all the potential causes have been properly examined and we don't endanger the public in the future as we go forward."

A senior Orbital executive on Tuesday said the blast was likely caused by excessive wear in the bearings of the Soviet-era NK-33 engine that was refurbished by GenCorp's Aerojet Rocketdyne unit.

GenCorp said its own independent investigation showed that the excessive wear in the bearings was likely caused by so-called "foreign object debris" that got into the engine.

The final determination of the cause could have significant financial implications for the companies involved.
The Orbital said it expects to submit the final report of the company-led accident investigation to the FAA this week or next.

NASA is completing its own investigation of the incident, but has no plans to make that assessment public.

[Grumant]

Я думаю, многочисленные темы о штучных, номерных грузовых кораблях (Прогрессах, драконах, лебедях и аистах) следует убрать из "Пилотируемой космонавтики". Они не имеют никакого отношения к названной проблематике и являются обычным мусорным контентом.

[Apollo13]

anik пишет:
И какой же из них вы верите? Их две.

Той которая будет признана в суде. Если НК-33 не виноват Орбиталу придется заплатить Аэроджету немаленькую сумму.

[Apollo13]

Grumant пишет:
Я думаю, многочисленные темы о штучных, номерных грузовых кораблях (Прогрессах, драконах, лебедях и аистах) следует убрать из "Пилотируемой космонавтики". Они не имеют никакого отношения к названной проблематике и являются обычным мусорным контентом.

Скажите сколько еще подобных предложений вы собираетесь внести, прежде чем поймете что никто ничего на форуме менять не станет?

[Grumant]

Ничего не меняется только в бессточном озере, которое постепенно зарастает и превращается в болото. Чёрный форум близок к этому.

[Apollo13]

Grumant пишет:
Ничего не меняется только в бессточном озере, которое постепенно зарастает и превращается в болото. Чёрный форум близок к этому.

Плохой форум. Неправильный. Фу!

[che wi]

Parabolicarc.com @spacecom · 10h ago

NanoRacks got about 10 satellites back from the Antares conflagration back in October. "They were a little sandy."

[Александр Ч.]

[Александр Ч.]

Забавная статейка Квантовый прибор выжил после взрыва ракеты «Антарес»

Ученые не рассчитывали, что спутник и их прибор сможет пережить эту катастрофу.Статья с описанием проекта завершалась словами: «Хотя прибор мог перенести запуск на орбиту, работу на орбите, и небрежное обращение со стороны студентов, он вероятно не мог выдержать силовой демонтаж ракеты-носителя в быстро расширяющемся шаре из окисляющегося керосина и жидкого кислорода».

Однако ученые ошибались: в августе на пляже недалеко от места катастрофы был найден практически неповрежденный спутник GomX-2. Его передали компании GomSpace, где специалисты сняли данные с квантового прибора сингапурских физиков.

[Apollo13]

NASA'S RESPONSE TO ORBITAL'S
OCTOBER 2014 LAUNCH
FAILURE: IMPACTS ON
COMMERCIAL RESUPPLY OF THE
INTERNATIONAL SPACE STATION


https://oig.nasa.gov/audits/reports/FY15/IG-15-023.pdf

[Salo]

National Aeronautics and Space Administration
NASA Independent Review Team Orb–3 Accident Investigation Report
Executive Summary
http://www.nasa.gov/sites/default/files/atoms/files/orb3_irt_execsumm_0.pdf

[Nilk]

Grumant пишет:
Они не имеют никакого отношения к названной проблематике

Ого, а я и не знал 

[Apollo13]

Из отчета:

The IRT was not able to isolate a single technical root cause for the E15 fire and explosion. The IRT
identified three credible technical root causes (TRCs), any one or a combination of which could have
resulted in the E15 failure:
 TRC-1: Inadequate design robustness of the AJ26 LO2 HBA and turbine-end bearing for
Antares. After performing extensive technical design evaluation and a number of sensitivity
analyses of the LO2 turbopump, it became apparent to the IRT that the HBA and thrust bearing
designs have several intricacies and sensitivities that make it difficult to reliably manage bearing
loads. As a result, this area of the turbopump is vulnerable to oxygen fire and failures. The AJ26
engines were not subjected to a thorough delta-qualification program to demonstrate their
operational capability and margin for use on Antares. Performing a thorough delta-qualification
program for Antares would likely have revealed these issues. Furthermore, the Acceptance Test
Program (ATP) established for the AJ26 engines was not sufficient to test and screen the engines
for these design sensitivities and potential workmanship issues that could exacerbate those
sensitivities.
 TRC-2: Foreign Object Debris (FOD) introduction to the E15 LO2 turbopump. Forensic
investigation identified the presence of both titanium and silica FOD within E15 prior to its
impact on the beach. However, no firm conclusions can be drawn with respect to the quantity of
FOD introduced to or already present within the engine prior to or at the time of the explosion.
The lack of significant particle impact damage to the recovered impeller and other components
indicates that there were not gross-levels of FOD present within the system. In addition, there is
no clear forensic evidence that FOD directly or indirectly led to the E15 failure. 
October 9, 2015 6
 TRC-3: Manufacturing or other workmanship defect in the E15 LO2 turbopump. Forensic
investigation performed by Orbital ATK and NASA discovered the presence of a defect on the
turbine housing bearing bore that was not consistent with baseline design requirements3
. The investigation determined that the defect was introduced during machining of the bearing bore
housing and was therefore present prior to the engine ATP and Antares launch for Orb-3.
Forensic investigation of Engine E17, which failed during ATP in May 2014, discovered the
presence of a similar non-conforming defect in the housing bearing bore. A limited number of
other engine turbine housings (i.e., Engine E16 and the 1998 test engine) previously and
successfully subjected to extended ground tests and ATP, as well as an untested spare turbine
housing, were inspected. Neither E16 nor the spare housing showed any evidence of a similar
manufacturing defect. However, the 1998 test engine that had been subjected to extensive ground
testing exhibited a similar defect to that observed in Engines E15 and E17, but it was not possible
to conclude whether the defect was introduced during manufacturing or was the result of wear
from extended operation of the engine. Sufficient information is not available without further
engine inspections and tests to conclude that the presence of this manufacturing defect would
always result in failure of the engine during operation. 

Кто может точно перевести "defect on the turbine housing bearing bore"? Это дефект корпуса турбины в месте отверстия для подшипника или дефект корпуса самого подшипника? Или что-то другое? По смыслу текста дальше мне кажется более вероятно первое.