Share the QR code < / P > < p > with wechat scanning code to friends and circles of friends < / P > < p > < / P > < p > on September 20, Tianzhou 3 cargo spacecraft was successfully launched. That night, Tianzhou 3 successfully docked with the backward port of Tianhe core module of the space station. So far, the Mid Autumn Festival space express "signed" successfully < p > Wang Ran, chief designer of the cargo spacecraft system of the Fifth Academy of China Aerospace Science and technology group, said that the main task of the cargo spacecraft is to transport and store goods for the space station, transport and replenish propellant, collect and store waste, bring it back to the atmosphere for destruction, and Tianzhou 3's trip is no exception < p > Tianzhou III mission is the second cargo transportation application flight in the key technology verification and construction stage of the space station. The cargo spacecraft is fully loaded and carries goods such as on orbit resident materials, space station backup equipment and space science load that can support three astronauts for six months < p > Wang Ran said that in terms of cargo loading, Tianzhou 3 cargo ship inherited the experience of Tianzhou 2 cargo ship and made continuous optimization and improvement. Compared with Tianzhou II, Tianzhou III has a higher cargo loading density and a higher efficiency of cargo installation at the launch site < p > how to ensure that the materials sent to space are free from pollution? Wang Ran said that in addition to the process control of cargo production and delivery, the cargo spacecraft should also conduct comprehensive and detailed testing before flying, including microbial testing, harmful gas testing, etc. From the beginning of "Tian Zhou two", COVID-19 nucleic acid detection has been carried out in a targeted manner. It is sure that no pollution will be introduced after docking. "This is both responsible for astronauts and also for space stations," he said. p> < p > the cargo spaceship not only has the functions of transporting goods and adding propellant, but also a good carrying experimental platform, because it has the characteristics of up and down many times a year and large loading space, which can provide good experimental conditions for the load, provide standard electromechanical thermal interface and facilitate standardized design < p > Wang Ran said that the docking of Tianzhou III, like Tianzhou II, also uses the "all phase, all autonomous and rapid rendezvous and docking scheme", that is, the spacecraft, whether it is long-distance guidance or short-range rendezvous, is completed with full autonomous intelligence and no manual intervention in the whole process < p > the relevant person in charge of the Fifth Academy of China Aerospace Science and technology group said that Tianzhou 3 was the first mission of the manned space project after July 1. The test team of the Tianzhou 3 launch site of the Academy summarized the achievements of the first stage of party history learning and education, and continuously accumulated energy with the theme of Tianzhou "energy gathering ring", which provided strong guidance and guarantee support for the success of the launch mission < p > according to the plan, China will launch the Shenzhou 13 manned spacecraft in October this year. Next year, China will launch the sky inquiry experimental module, the dreamsky experimental module, two manned spacecraft and two cargo spacecraft to complete the on orbit assembly and construction of the space station. In the future, the space station will become a national space laboratory < p > Zhongqing daily · zhongqing.com reporter Qiu Chenhui source: China Youth Daily < / P > < p > related reading: < / P > < p > [Tianzhou 3 "freight train": heat insulation, rain protection and wind resistance] < / P > < p > on September 20, the Long March 7 remote 4 carrier rocket lifted Tianzhou 3 cargo spacecraft into space at China's Wenchang space launch site and successfully put it into the predetermined orbit, China's "heavenly palace" New visitors to the space station < p > astronauts should be stationed in the space station for a long time. They need to eat, wear, use and even breathe. The fuel needed to maintain the correct orbit of the space station depends on cargo spacecraft. In order to ensure the safety of "space express" in the transportation process, the researchers of the first Institute of China Aerospace Science and technology group specially built the rocket into a "freight car" that is heat, rain and wind proof According to Yao Ruijuan, structural designer of the Long March 7 remote-4 launch vehicle of the first Academy of China Aerospace Science and Technology Corporation, during the rocket flight, the core engine will eject a hot flame. At this time, the rear transition section of the booster will bear the strong heat flow of flame retraction, and if its thermal protection design is not enough, it will cause structural ablation, Over design will affect the carrying capacity of the rocket < p > Yao Ruijuan said that therefore, designers innovated the application and installation methods of heat-proof materials and "draped" special heat-proof felt like "cardigan" on the rocket booster, which not only has lighter weight, but also has higher heat-proof efficiency < p > she told reporters that if the traditional method is adopted and the anti heat coating is sprayed at the rear transition section of the booster, the production cycle will be longer. Therefore, the designers innovated their ideas and changed the heat proof clothing from "spraying" on the surface of the rear transition section to "covering" on the body < p > the designer used high temperature resistant materials to make a flexible heat-proof felt for the booster. It has "inside", "face" and interlayer. It starts from the side close to the core stage and wraps the booster like a "cardigan" at the outer opening away from the core stage, so as to prevent the rear transition section from being "roasted" by fire < p > Yao Ruijuan said that the traditional heat protection method is adopted, and the heat protection coating is sprayed on the booster as a whole, with the weight ranging from 70kg to 100kg, while the weight of the new heat protection felt is only about 20kg, the weight is reduced by about 75%, and the heat protection effect is better. The flexible heat proof felt has been successfully applied on the Long March 7 rocket, and will be popularized and applied to other models in the future < p > "raincoat" < / P > < p > the launch site of the new generation launch vehicle has a humid climate and heavy precipitation. There is more moderate rain of 5-15mm in 12 hours of the year. Lu Songtao, a designer of the overall department of the first Academy of China Aerospace Science and technology group, said that when selecting the launch window of active rockets, they will avoid thunderstorms, while the Long March 7 rocket can realize moderate rain launch, because the new generation of launch vehicles have made a "waterproof" design < p > in fact, the waterproof of rockets is not just rain proof. Those who have seen the rocket launch have seen the filled rocket. Affected by the low-temperature propellant, the surface temperature of the rocket is low, and the condensed water flows down the rocket like rain. This is also the water that the rocket should prevent. In addition, the condensed water on the arrow wall and pipeline may also freeze, and ice melting will form frost melting water, etc < p > How are rockets waterproof? Lu Songtao said that in the waterproof design, the developers follow the principle of "what can be solved in a single machine, not in the system, and what can be solved in the system, not in the overall solution" to solve the waterproof problem from the "product source" < p > at the beginning of the design of the new generation launch vehicle, the waterproof function should be realized through structural design as far as possible. Lu Songtao said that there are more than 1000 waterproof parts of the electrical connector of the Long March 7 rocket, which does not include the cable body, cable import and export, instrument body, instrument and structure gap and overall professional waterproof of the structure, which can be seen from the large waterproof workload < p > resistant to grade 8 wind < / P ><
2023-03-22 10:04:44