CEV "Constellation" и лунная программа НАСА

[Agent]

Любопытная презентация о реголите и способах его использования
Много интереных картинок
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20090020653_2009019747.pdf

[Чебурашка]

http://www.aviationweek.com/aw/generic/story.jsp?id=news/Study061509.xml&headline=Study%20Finds%20Human-rated%20Delta%20IV%20Cheaper&channel=space

But the human-rated United Launch Alliance rocket would be less expensive only if the Ares V heavy-lift moon rocket development is deferred, the Aerospace Corp. study reports. And the Delta IV alternative could add two years or more to the "gap" in U.S. human access to orbit if it starts this year, according to the unreleased study obtained by Aviation Week.

"Делта-4" или "Атлас-V" для прилотируемых полётов может быть дешевле "Ареса-1" только если разработка "Арес-5" будет отложена. Также отказ от "Ареса-1" в пользу "Дельта-4" приведёт ещё к двум или более годам задержки в пилотируемых полётах, что и требовалось доказать

Помнтися, здесь кипели жаркие споры зачем НАСА нужен "Арес-1".  Ответ очевиден.

[avmich]

Видели мы такие прогнозы и анализы. Кто что заказывает, тот то и получает.

[Петр Зайцев]

Видели мы такие прогнозы и анализы. Кто что заказывает, тот то и получает.

Гофф уже кипел сегодня:
https://twitter.com/mojaverocketguy/status/2202121768
"Kind of sad that Aerospace Corp allowed NASA to sully their good name by running an analysis using such ridiculously flawed assumptions."

Главное всем ясно насколько все подмухлевано. Не могли получить данные на РД-180 "от русских". А что насчет доков которые Пратт-Витни получили с такой помпой? Оне что, неполны оказались?

[ronatu]

A 10-person committee charged with reviewing the future of U.S. human spaceflight will hold its first public meeting today, beginning a process that must cover a lot of territory in very little time.

The independent panel of experts will examine NASA's Constellation Program, which plans to send humans to the International Space Station (ISS), the moon, and possibly Mars, and will consider alternatives to options already on the table.

The review comes at a time when the Space Shuttle is facing retirement, and a new launch system, called Ares, isn't scheduled to begin operations until at least 2015, leaving a gap in U.S. launch capability of five years or more. NASA's Constellation Program has attracted criticism for the Ares design, as well as for slipping timelines and budget overruns.

In a speech at MIT last week, John Holdren, director of the White House Office of Science and Technology Policy, outlined three key questions that the panel will examine: whether it's possible to reduce the gap in launch capability, what the options are for extending the use of the ISS beyond 2016, and what a timetable for missions beyond low-earth orbit (LEO) might look like, given budget constraints.

It is notably an "advice only" committee: it will analyze options and present recommendations but will not determine the future of human spaceflight. "We're not being asked to pick the direction," says Edward Crawley, Ford Professor of Engineering at MIT and one of the 10 panelists. "That's why the president gets paid the big bucks. We just give him the list of options."

The committee will report its findings to the Obama White House, Holdren, and a new NASA administrator: retired astronaut Charles Bolden is currently awaiting confirmation hearings. The panel's report is expected by the end of August in order to affect an administration decision on the way forward, before the 2010 financial-year budget is set.

.....................

http://www.technologyreview.com/business/22869/

[ronatu]

The technical background of the panel, says Logsdon, equips the members to examine the current Constellation Program. Criticism of the Constellation "architecture," particularly the design of the Ares launch system, which requires separate rockets for crew and cargo, cropped up during President Obama's NASA transition-team investigations. The question was whether this architecture or those based more heavily on existing technologies could be built faster and more cheaply. According to Logsdon, that criticism prompted the transition team to recommend that before the president "embraces" the current architecture, he get an independent judgment on whether it's the right one. "And that's what this panel is set up to do," Logsdon says.
......

The panel will also debate a balance of human missions with robotic ones. These could involve precursors to moon or Mars missions that set the stage for human exploration, as opposed to purely robotic missions.

Other issues include opportunities that exist for international collaboration and how to further stimulate commercial spaceflight capability--NASA has already issued contracts to two space companies, SpaceX and Orbital Sciences, to bring cargo to the ISS.

The panel must also consider whether the United States should stay involved with the ISS beyond 2015. "You cannot just go back to the moon and utilize the space station at the same time on the same projected budget," says Logsdon. "You have to give up goals, schedule, or increase the budget."

[ronatu]

Still, Crawley believes that the panel's influence will be significant. "There are times and places where these groups can make an impact," he says.

"At the beginning of an administration, with a high-ticket item like the space program, there's a lot of influence." Logsdon agrees that the panel is "absolutely crucial to NASA's future and the country's future in space."

[Димитър]

Любопытная презентация
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20090020653_2009019747.pdf

Указано ПН Ареса-5 на ЛЕО - 131 тонн. Документ от мая сего года.
А кто говорил про 180 и больше тонн на ЛЕО ?

[Agent]

Главное всем ясно насколько все подмухлевано. Не могли получить данные на РД-180 "от русских". А что насчет доков которые Пратт-Витни получили с такой помпой? Оне что, неполны оказались?

А что, там есть ТТХ и цена пилотируемого варианта двигателя , а также сроки и стоимость разработки и сертификации? Попробуйте ка получить такие данные от Энергомаша....

[serb]

А кто говорил про 180 и больше тонн на ЛЕО ?

Сайт НАСА. Там было 181 т на ОИСЗ и 75 ЕМНИП тонн к Луне

[Agent]

Любопытная презентация
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20090020653_2009019747.pdf

Указано ПН Ареса-5 на ЛЕО - 131 тонн. Документ от мая сего года.
А кто говорил про 180 и больше тонн на ЛЕО ?

А на количество двигателей и диаметр не обратили внимания?
Документ не про Арес-5, а про реголит.
Официально текущая конфигурация вот http://www.nasa.gov/pdf/187392main_377019AresV.pdf
188 тонн на ЛЕО

[Agent]

Презентация НАСА для комиссии Августина
http://www.nasa.gov/pdf/361041main_20090617Human_Spaceflight_CxOverview.pdf

Видео со страницы 14 http://anon.nasa-global.edgesuite.net/anon.nasa-global/ccvideos/ConstellationLaunchingaProgram.asx

[Agent]

Из документа по текущим ключевым проблемам

Integrated Performance Across the Mission Phases
• Element level control masses are established to ensure integrated performance
• ISS mission total margin: Ares I: 22% / Orion: 23% / Cx: 5%
• Lunar mission total margin: Ares I: 18% / Orion: 10% / Cx: 4%
• Orion Crew Module mass limit set by recovery system and water landing constraints, not by Ares lift mass


 Tower Clearance/Launch Drift
• All launch vehicles experience drift due to winds at the pad
• Ares being designed for a 34 knot wind requirement
• No contact with pad assured by either: 1) constraining Southerly winds to 15-20 knots and/or 2) steering at liftoff (Saturn V). Focus now is on best combination to minimize plume damage



Induced Environments : Thrust Oscillation and Vibroacoustics
• All launch vehicles experience vibration
• Thrust oscillation occurs because stack and motor resonance frequencies align late in 1st stage flight
• Pursuing baseline solution plus alternatives that will reduce loads to crew performance requirements with high (3 sigma) confidence
• All subsystems being designed to accommodate / mitigate liftoff and flight vibroacoustics


Ares/Orion Loss of Mission/Loss of Crew
• Ares and Orion are being designed from the outset to maximize crew safety
• Goal is to be 10x safer than Shuttle (LOC of 1:160-270)
• Current ascent estimate is 1 in 2,850 for a loss of crew event
• To date, over 60 vehicle design changes on Orion have been made to improve LOC/LOM during 5 design/analysis cycles.

Post Landing Crew Survival
• Orion design supports several contingencies: including land landing and a minimum of 24 hours of crew water survival time


Budget requirement through 2015
• Current requirement for IOC capability is $35B at 65% confidence
• Original plan was to spend an additional $9B on lunar system developments (Ares V,Altair, etc)


 Schedule for ISS initial operating capability
• External commitment stable at March, 2015
• Methods to improve schedule confidence were recommended in early FY09 study
• Program-wide content review in progress
• 6 vs 4 crew on Orion was driven by these activities

[Петр Зайцев]

Budget requirement through 2015
• Current requirement for IOC capability is $35B at 65% confidence
• Original plan was to spend an additional $9B on lunar system developments (Ares V,Altair, etc)

Не удивительно, что в народе брожение. Это веть не 35 миллионов и даже не 35 тысяч миллионов, а 35 миллионов миллионов. Уму непостижимо. Сравнить бы с затратами на Ангару.
-- Pete

[Agent]

Budget requirement through 2015
• Current requirement for IOC capability is $35B at 65% confidence
• Original plan was to spend an additional $9B on lunar system developments (Ares V,Altair, etc)

Не удивительно, что в народе брожение. Это веть не 35 миллионов и даже не 35 тысяч миллионов, а 35 миллионов миллионов. Уму непостижимо. Сравнить бы с затратами на Ангару.
-- Pete

Как можно сравнивать затраты на всю лунную программу с затратами на ракету, которую никто не делает?

[kopiev]

35 billions = 35 миллиардов. Америка.

[Димитър]

А кто говорил про 180 и больше тонн на ЛЕО ?

Документ не про Арес-5, а про реголит.
Официально текущая конфигурация вот http://www.nasa.gov/pdf/187392main_377019AresV.pdf
188 тонн на ЛЕО

Спасибо !
Впечатляет, однако ...

[ronatu]

[ronatu]

NASA Tests Orion Seat Shock Absorbers

Engineers at NASA's Langley Research Center are using the Landing and Impact Research Facility to test the seat pallet that will protect astronauts in the planned Orion crew capsule from the shock of landing.



Requirements call for Orion to be able to parachute-land anywhere on Earth after returning from space, although the nominal spot would be in the Pacific Ocean off Catalina Island, Calif. To test the pallet and its "energy-absorbing struts," the 20,000-pound test article is dropped 18 feet onto a crushable honeycomb material designed to simulate different landing surfaces.

The Orion project also is using the seat shock absorbers to help mitigate vibrations the crew experiences as a result of thrust oscillation expected to be generated by the Ares I crew launch vehicle solid-fuel first stage in the final 10 seconds before burnout. NASA is raising Gemini-era standards that limited crews to a peak of 0.25g for the sort of longitudinal vibrations the thrust oscillation imparts to 0.7 g.

The higher load is based on tests with astronaut/subjects at Ames Research Center to determine just how much vibration hampers a crew member's ability to read modern displays and react to them.

Photo of Orion parachute test vehicle: NASA

[Walker]

Мне понравилось вот это: Jupiter Group, DIRECT project
Designed by anonymous NASA engineers in their spare time...
Cost per flight $100 mill (39 tonne)
Оказывается есть там свои энтузиасты. Интересно, обратят ли внимание на их проект?