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[美国] NASA将试飞“战神I-X”火箭 肩负返月重任

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gym9714 发表于 2009-10-28 23:27 | 显示全部楼层
现在看起来 天气不错啊!呵呵
Nighthawk 发表于 2009-10-28 23:27 | 显示全部楼层

Why a Four-Hour Launch Window?

本帖最后由 Nighthawk 于 2009-10-28 23:29 编辑

Posted on Oct 28, 2009 09:05:55 AM | Dan Kanigan | 2 Comments   


                               
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One question that comes up a lot is why Ares I-X has a four-hour launch window. After all, unlike the Space Shuttle, it doesn’t have to rendezvous with the Space Station, so what’s the challenge? Actually, there are several.


First, the Eastern Range typically allots 4-hour launch windows. Given the duration of Ares I-X (about seven minutes from liftoff until the final pieces splash down), more time is not required. As was demonstrated on the first launch attempt, the rocket can be reset quickly, so four hours was considered plenty of time to wait out weather and technical challenges.

Next, there are human limitations. Console operators in the Launch Control Center must be at their consoles at least 7 hours before the planned launch. When you add the 4-hour window this means that operators may have to be on station for 11 hours before launch. There is also a lot of work to do after launch or after a scrub.

Additionally, anyone familiar with Florida weather understands that winds typically pick up later in the day as the atmosphere heats up and interacts with evaporation from the ocean. Central Florida’s “afternoon thunderstorms” produce a terrific number of lightning strikes. High winds are a problem for any launch. Because of its experimental nature, Ares I-X has very conservative wind constraints—20 knots (nautical miles per hour—about 23 statute miles per hour) as opposed to the Space Shuttle, which can fly in winds up to 30 knots (34.5 miles per hour).

A 4-hour window, gives the team the ability to complete all the preparation work, wait for the right combination of winds, weather and clouds and then go. Following the LCC guidelines gives Ares I-X the best chance to collect the important data that we need for next exploration steps we take.

gym9714 发表于 2009-10-28 23:27 | 显示全部楼层
开始4分钟倒计时了,
rottenweed 发表于 2009-10-28 23:28 | 显示全部楼层
总算开始倒计时了。
cmj9808 发表于 2009-10-28 23:31 | 显示全部楼层
本帖最后由 cmj9808 于 2009-10-28 23:53 编辑

lift off! 天公还真作美,最后一刻来了个晴天
cmj9808 发表于 2009-10-28 23:32 | 显示全部楼层
SEPARATION!
freerico 发表于 2009-10-28 23:33 | 显示全部楼层
好象上天了
gym9714 发表于 2009-10-28 23:34 | 显示全部楼层
分离后姿态有问题?
rottenweed 发表于 2009-10-28 23:35 | 显示全部楼层
火箭上的视频数据传送似乎不稳定。
Nighthawk 发表于 2009-10-28 23:40 | 显示全部楼层

Liftoff! The Ares I-X Flight Test Begins

Wed, 28 Oct 2009 11:30:38 PM UTC+0800


Rising into the Florida sky, the 327-foot rocket thunders away from the launch pad, marking the first time a new vehicle has launched from the complex since the first space shuttle launch in 1981.

The mission will last two minutes, during which constant data received from the rocket.

At about the T+2 minute point in the flight, the upper stage simulator and first stage will separate at approximately 130,000 feet over the Atlantic Ocean. The unpowered simulator will splash down in the ocean. The first stage will be fired for a controlled ocean landing with parachutes that will allow recovery by one of NASA's booster recovery ships, while the other ship tracks the upper stage.
zhangwee 发表于 2009-10-28 23:41 | 显示全部楼层
本帖最后由 zhangwee 于 2009-10-29 06:01 编辑

看起来这次试飞过程很顺利的,模拟上面级落点近一些
Nighthawk 发表于 2009-10-28 23:47 | 显示全部楼层

Triboelectrification Questions? Try This

Posted on Oct 28, 2009 11:24:29 AM | Dan Kanigan | 0 Comments   

An earlier blog post attempted to answer questions about triboelectrification. Since there are still a few questions floating around we're reposting it for those who missed it on the first go-round.
Enjoy.

Flight Rules and Triboelectrification (What the Heck is That?)

The skies look clear except for some high clouds, there’s no rain in the immediate forecast, so why might a rocket not launch? The answer is something called triboelectrification. While this isn’t a word you encounter every day, you might experience it if you walk across a dry carpet or brush up against a cat and then touch a metal surface: it’s static.

In the case of Ares I-X, flying through high-level clouds can generate “P-static” (P for precipitation), which can create a corona of static around the rocket that interferes with radio signals sent by or to the rocket. This would create problems when the rocket tries to transmit data down to the ground or if the Range Safety Officer at Cape Canaveral Air Force Station needed to send a signal to the flight termination system. Until the 45th Space Wing and observer aircraft indicate that the skies are clear, Ares I-X will wait them out.


liudao 发表于 2009-10-28 23:50 | 显示全部楼层
发射了就好,等后续报道。
firstkinger 发表于 2009-10-29 00:41 | 显示全部楼层
祝贺,老美还真N呀
qiugb 发表于 2009-10-29 00:49 | 显示全部楼层
环球时报驻美国特约记者王启超报道 当地时间10月28日上午11点30分,美国“战神I-X”运载火箭在佛罗里达州肯尼迪航天中心顺利发射升空。

“战神I-X”火箭原定于美国当地时间10月27日上午8点发射,但由于天气原因被推迟到28日发射。“战神I-X”运载火箭耗资3.5亿美元,是美国国家航空航天局为替代临近退役的航天飞机编队而开发的新一代运载火箭。

“战神I”型火箭除担负向国际空间站运送人员和物资外,它也是美国重返月球计划的航天器之一。此次试射被称为承载着美国人重返月球乃至首登火星的希望。
qiugb 发表于 2009-10-29 00:58 | 显示全部楼层
视频截图

201076.jpg 201077.jpg
hkhtg090201 发表于 2009-10-29 08:02 | 显示全部楼层
21.jpg
开始发射就转向?
22.jpg
27.jpg
30.jpg
cjdam2003 发表于 2009-10-29 08:30 | 显示全部楼层
激波真漂亮啊,牛B
avatar 发表于 2009-10-29 10:37 | 显示全部楼层
5节的SRB怎么工作时间都没有增加啊,才124秒,和航天飞机SRB差不多吧?

而且脱离高度貌似更低了
cmj9808 发表于 2009-10-29 11:03 | 显示全部楼层
5段工作时间只比4段多几秒钟
Ares IX用的是4段SRB
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