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看来毛子和美鳖在国际空间站也是貌合神离除非必要都不呆一起 油管上看到的 During the Mir-Shuttle years it was a good relationship. The ISS years were never that good - NASA always excluded the Russians, and the Russians, to a lesser extent because they didn't have much anyway, so to speak - did the same. The Russians and the US always had different philosophies, unofficially of course, between them - Russians fix first, ask later - US - debate, question, query, think, then, maybe, fix, but do a conference before. Russians had to stay in their segment, looking down the corridor, seeing the activity in the USOS and not being able to take part in it. The only time they seemed to get together was the meal times. Or when something needed fixing that required both teams. The Russians at times felt like the janitors of the station. They had to make experiments for themselves - not having the science module attached of course had a lot to do with it - this resulted in the two SuitSat experiments, but not much more besides. The Russians themselves were pretty frustrated anyway - dwindling budget, Federation was go-nogo-go-maybe.., income seemed to be just the $400m for the Soyuz seats, and now these have dried up (though they saw that coming when Cargo Dragon started in 2012). I think the Chinese will help moneywise (PRC has been buying Russian space tech since the 90's anyway), and that will give a little kick to the Russians to get going again. Hopefully...Show less
今天看到的一个关于美国猎户座载人飞船的新闻看来NASA急了 就是说,NASA不想修好坏掉的一个PDU(电源和数据单元}了,因为要更换就必须拆了猎户座才行,如果要修好PDU.明年11月的发射就要再推迟一年了 NASA will fly Orion deep-space crew capsule ‘as is,’ despite failed component NASA is opting to fly its future deep-space crew capsule Orion “as is” next year, after the agency discovered that one of the spacecraft’s power instruments had suffered a failure. Engineers had been mulling over whether to replace the instrument before the vehicle’s flight but ultimately decided that there was enough redundancy in the system to withstand the failed component. Replacing the PDU wouldn’t exactly be a quick fix. Engineers were looking at options that would have taken four to 12 months to complete. The fixes would have involved either taking apart the vehicle or tunneling through the outer walls to reach the PDU, and the extra time could have potentially caused a delay for Orion’s target launch date in November 2021. Instead, NASA has chosen not to replace the PDU. The instrument can still function; it just lost one of its power channels used for redundancy. That means this PDU will fly without a backup system in case its primary channel fails. NASA claims that fixing the PDU presented more risk than flying with the PDU. “[Engineers] determined that due to the limited accessibility to this particular box, the degree of intrusiveness to the overall spacecraft systems, and other factors, the risk of collateral damage outweighed the risk associated with the loss of one leg of redundancy in a highly redundant system,” the agency wrote in its blog post. “Therefore, NASA has made the decision to proceed with vehicle processing.”
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