Day boat first cargo spacecraft is ready, you can start. Carries the force is the strongest ship in active service | s | | day boat first, s _ news
> First cargo spacecraft has entered the boat launch area
[Global network of military-aviation, April 18 global times special correspondents Zhang Yichi global times, Liu Yang], according to the China manned space engineering office, news, the morning of April 17, day boat first cargo spacecraft has entered the launching area, vertical transport of completed, marking the day the boat first, officially entered the launching phase of the mission. Day boat first, is China's first cargo ship, before its launch mass than Temple on the second largest space laboratory and into space, China is likely to become the most massive loads. In addition, its capacity is also the largest cargo ship in active service in the world.
"Space express little brother" ready first flight
According to the China manned space engineering office, news, day boat first cargo ship and the long seventh away II launch vehicle on April 17 completed Assembly testing and other technical aspects of the work. At 7:30, carries the long seventh away from the second launch day activities boat combination first cargo spacecraft launch platform sailed out of the Assembly and test facility, smooth for about 2.5 hours later, vertical transport to the launch area. Following the boat launch day first cargo spacecraft with long seventh so far, two joint launch vehicle function testing and test, after completing the final confirmation, the replenishment of propellant rocket, planned launch from April 20 to 24th time.
Day boat first, is China's first independently developed cargo ships, due to its freight-only, do not send people, so nicknamed by some media as "express little brother." It uses a two-class structure, a smaller diameter is a propulsion module, larger diameter for the cargo. The maximum diameter of 3.35 meters, 10.6-metre ship, load capacity of up to 6.5 tons, carrying goods weighing 13.5 tons. If the full load, it is likely to become China's most massive payload launched into space. Even larger than the temple on the second space laboratory, which is 10.4 meters long, 3.35 meters in diameter, weight of 8.6 tonnes.
First verify that "space filling"
According to the China manned space engineering office, news, day boat first, the mission is a laboratory complete with the temple on the second space rendezvous and docking, imposition of propellants in orbit for additive, breakthroughs and mastered adding key technologies such as the propellants in orbit.
Experts say that is a space lab or space station, in near-Earth orbit due to air resistance, "high", if not maintaining height, its orbital lifetime is limited. The need to initiate in order to keep track of rocket engine height, but his fuel is limited. This is called "space filling" in-orbit propellant feeding technology needs. Propellants in orbit supplement currently available technology is only the United States and Russia, the days the boat is first tested this technology is an important mission, which is also the key to the smooth development of China's future space station technology. To do this, launch into orbit of temple on the second installation of a new feeding system, the additional principle is similar to tubing and the butt of the gun, but very high precision and sealing requirements.
Experts say, also now has a way of maintaining a track added, is after the cargo ship docking with the space station, using its own engine, "burn" the extra fuel to raise the orbit of the space station. However, such an orbit maintenance for the spacecraft's position, on the interface stress has very high requirements, this approach is not flexible enough.
Active-duty carry most cargo ships
Experts said that China built space station before and after planned in 2022, its initial scale consists of a core and two experimental class, if you want to keep the astronauts in orbit for a long time, and lot cargo spacecraft is a must.
Experts said the cargo ship came from evolution of manned spacecraft. Cargo ships can transport propellant fuel, maintenance and replacement of equipment, the astronaut's life, work and space science laboratory equipment and supplies, also can be used to adjust the orbit of the space station. In the 1970 of the 20th century, the former Soviet Union and the United States began to develop large, long life and wide use of the space station. At first, the two are mixed of domestic employment of manned spacecraft for the space station to provide a small amount of supplies, every time can only be delivered to the space station manned hundreds of kilograms of supplies cannot meet the demand. The Soviet Union took the lead in the Soyuz manned spacecraft has been developed on the basis of the progress cargo spaceship, its 6.6 cubic metres of cargo space, carrying capacity of 2.6 tons, and in-orbit propellant added services. European cargo ships called automatic transfer vehicles, length 10 m, maximum diameter of 4.5 meters, and weighs about 10 tons of cargo capacity of up to 7 tons, is the largest cargo ship capacity so far, from 2008 through 2014 launch a total of 5, but has now stopped.
America's "Dragon" ship length 5.9 m, a maximum diameter of 3.7 metres, the transported load 6 ton of maximum quality, returns the maximum quality 3 ton load, it is also a cargo spacecraft to the Earth back to the master. In addition, the United States of "Cygnus" and Japan's HTV cargo spacecraft carrying capacity is 2.7 tonnes and 6 tonnes. Overall, day boat capacity is the top of the first, and its carrying capacity is the maximum in a cargo ship in active service.
>: Tang Liu Longlong
Article keywords:S day boat, s
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天舟一号货运飞船已准备完毕，可以出发。运载力是现役飞船最强|飞船|天舟一号|空间站_新闻资讯
>天舟一号货运飞船已经进入发射区
[环球网军事-航空4月18日报道 环球时报特约记者 张亦驰 环球时报记者 刘扬]据中国载人航天工程办公室消息，4月17日上午，天舟一号货运飞船已经进入发射区，垂直转运的顺利完成，标志着天舟一号飞行任务正式进入发射阶段。天舟一号是中国第一艘货运飞船，它的发射质量比之前的空间实验室天宫二号都大，很可能将成为中国送入太空质量最大的载荷。另外，其运载能力也是世界现役货运飞船中最大的。
“太空快递小哥”准备首飞
据中国载人航天工程办公室消息，天舟一号货运飞船与长征七号遥二运载火箭于4月17日完成了总装测试等技术区各项工作。当天7时30分，承载着长征七号遥二运载火箭与天舟一号货运飞船组合体的活动发射平台驶出总装测试厂房，平稳行驶约2.5小时后，垂直转运至发射区。之后，将在发射区开展天舟一号货运飞船与长征七号遥二运载火箭功能检查和联合测试工作，完成最终状态确认后，火箭加注推进剂，计划4月20日至24日择机发射。
天舟一号是中国自主研制的首艘货运飞船，由于它只运货，不送人，所以被一些媒体昵称为“快递小哥”。它采用两舱式结构，直径较小的是推进舱，直径较大的为货物舱。其最大直径达到3.35米，飞船全长10.6米，载荷能力达到了6.5吨，满载货物时重13.5吨。如果此次满载的话，它很可能将成为中国发射进入太空的质量最大的有效载荷。甚至比天宫二号空间实验室还大，后者全长10.4米，直径同为3.35米，质量为8.6吨。
首次验证“太空加油”
据中国载人航天工程办公室的消息，天舟一号此次任务是与天宫二号空间实验室完成交会对接，首次实施推进剂在轨补加，突破和掌握推进剂在轨补加等关键技术。
专家表示，无论是空间实验室还是空间站，在近地轨道运行都会由于空气阻力而“掉高度”，如果不能维持高度，其在轨寿命将比较有限。这需要火箭发动机适时启动以保持轨道高度，但是其携带的燃料是有限的。这就为被称为“太空加油”的在轨推进剂补加技术提出了需求。目前掌握推进剂在轨补加技术的只有美俄两国，此次天舟一号的一个重要使命就是验证这项技术，这也是决定中国未来空间站能否顺利发展的关键技术之一。为此，先期发射入轨的天宫二号安装了一套全新的补加系统，其补加原理类似于油管与油枪的对接，不过精度和密封性要求非常高。
专家表示，目前国际上还有一种维持轨道的补充方式，就是货运飞船与空间站对接后，利用自身发动机“烧掉”多余的燃料抬高空间站轨道。不过这种轨道维持方式对于飞船的位置、对接口受力都有很高要求，另外这种方式也不够灵活。
现役运载能力最强货船
专家表示，中国计划在2022年前后建成空间站，其初步规模包括一个核心舱和两个实验舱，如果想保持航天员长期在轨飞行，货运飞船是必可不少的。
专家表示，货运飞船是从载人飞船演变过来的。运货飞船可以运输推进剂燃料、维修和更换的设备、航天员的生活、工作用品以及空间科学实验设备和用品等，此外还能用于调整空间站轨道高度。在20世纪70年代，前苏联和美国开始发展体积大、寿命长、用途广的空间站。刚开始时，两国都是用人货混装的载人飞船为空间站提供少量补给，每艘载人飞船一次只能为空间站运去几百公斤的物资，无法满足需求。苏联率先在联盟号载人飞船的基础上研制了进步号货运飞船，其货舱容积为6.6立方米，运载能力为2.6吨，并可进行在轨推进剂补加服务。欧洲的货运飞船叫自动转移飞行器，全长10米，最大直径为4.5米，重量约10吨，运货能力可达7吨，是迄今运载能力最大的货运飞船，从2008年起到2014年共发射了5个，但目前已经停止建造。
美国的“龙”飞船长5.9米，最大直径3.7米，其运送载荷最大质量6吨，返回载荷最大质量3吨，它也是货运飞船中往地球运回物品的高手。此外，美国的“天鹅座”和日本的HTV货运飞船运载能力分别为2.7吨和6吨。总体来说，天舟一号的运载能力是居于前列的，而在现役货运飞船中其运载能力是最大的。
>责任编辑：柳龙龙
文章关键词： 飞船 天舟一号 空间站
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