Xinhua News Agency Hainan Wenchang March 12 electrical

problem: a new member to fill the high orbit carrying capacity of the Long March carrier rocket family blank "long seven reform" the official entry list

  Xinhua News Agency reporters Hu Zhe and Chen Kaizi

  In the early morning of the 12th, the Long March 7-to-Yao-2 carrier rocket ignited and lifted off at the Wenchang Space Launch Site in China, and successfully sent the test 9 satellite into its intended orbit.

The Long March VII modified carrier rocket is also referred to as the "Changqi modified" rocket. It has returned after more than 300 days. This new member of the Long March carrier rocket family has finally officially entered the list and will fill the high-orbit orbit carrying capacity of my country’s carrier rockets. blank.

The "Chang Qichang" is not only beautiful in appearance, but also tall and tall

  The "Changqichang" rocket has a total length of 60.1 meters. It is improved and developed on the basis of the Long March 7 rocket. It is 7 meters longer than the Long March 7, which also makes its appearance look slender and tall.

  "In daily life, thin and long things are easier to break, and this is also true for rockets." said Shen Dan, the overall designer of the "Changqichang" rocket at the First Academy of China Aerospace Science and Technology Corporation. In order to solve this problem, the development team "Moving flowers to wood", using the old craft storage boxes of the Long March 7 co-trained arrow and the Long March 3 A rocket to assemble a full-arrow modal rocket to ensure that its attitude stability and control accuracy meet the mission requirements.

  When the slender rocket penetrates the atmosphere, it may face the risk of "breaking down".

The rocket development team adjusted the rocket's flight attitude based on the high-altitude wind data measured several hours before launch, allowing it to "go forward" along the best path, reducing the risk of the rocket after it lifted off.

"Chang Seven Reform" has more "good skills" than Long March 7

  The Long March 7 rocket can meet the launch requirements of low-Earth orbit cargo spacecraft, but if the satellite is to be sent into a geosynchronous transfer orbit with a perigee of 200 kilometers and an apogee of 36,000 kilometers, its carrying capacity will be less than 4 tons.

During the development of the "Chang Seven Modifications", the hydrogen and oxygen three sub-modules of the Long March III A series rockets were added, so that it has the basis of a geosynchronous transfer orbit carrying capacity of 7 tons, as well as a zero-inclination orbit, a lunar orbit, etc. High orbit launch capability.

  In rocket development, adding modules is not as simple as "building blocks."

Wei Yuanming, chief designer of the "Changqiqichang" rocket at the First Academy of China Aerospace Science and Technology Corporation, introduced that the "Changqiqichang" rocket fully inherits the mature modules of the Long March 7 and Long March 3A series rockets, and has many key technological innovations. .

  According to statistics, the failure of the power system accounts for nearly half of the reasons for the failure of rocket flight in the world.

The "Changqiqichang" adopts guidance and control technology that adapts to typical failure modes. The rocket will plan an optimal path to fly by itself based on information such as position and speed, making it more intelligent.

  In addition, through technological innovation, the "Changqichang" rocket can reduce a set of separation mechanism, greatly reduce the complexity of the separation system, and improve the reliability and economy of the rocket.

The follow-up of "Changzhou Seventh Reform" will undertake many major national tasks

  Ma Zhonghui, deputy chief designer of the "Changqiqichang" rocket of the First Academy of China Aerospace Science and Technology Corporation, introduced that the green and environmentally friendly rocket "Changqiqichang" with liquid oxygen and kerosene propellant is one of the main rockets of the new generation of carrier rockets, and its launch is a sign of success. my country’s aerospace medium-sized carrier rocket is upgraded and upgraded.

  It is reported that the "Chang Seven Modification" rocket can meet the high-density launch requirements of medium and large high-orbit satellites. In the future, it will be in 36,000 kilometers of geosynchronous orbit with the Long March III A series rocket with a carrying capacity of 5.5 tons and a 14-ton carrier. Together with the capable Long March 5 rockets, a more optimized and reasonable capacity layout has been formed, and China's aerospace capabilities have been greatly enhanced.

The follow-up of the "Changzhou Seven Reform" rocket will gradually become a basic type of my country's medium-sized high-orbit rocket, and will undertake a series of major national tasks.

  Meng Gang, commander-in-chief of the "Changqichang" rocket at the First Academy of China Aerospace Science and Technology Corporation, said that according to the current mission schedule, the "Changqichang" rocket will perform three to five launch missions per year by 2025, and will be upgraded according to mission requirements in the future. , The launch of zero-degree orbital inclination satellites and the launch of deep space exploration missions such as lunar exploration, fire detection and asteroid detection.