Share with friends and circle of friends by scanning QR code on wechat_ blank" href=" https://news.163.com/news/search?keyword=%E7%81%AB%E7%AE%AD "> the long march 3B carrier rocket developed by the Rocket Technology Research Institute (hereinafter referred to as" the rocket Institute ") took off from Xichang Satellite Launch Center and accurately put fy-4b into the predetermined orbit, and the launch was a complete success < p > many space enthusiasts should see the difference. This rocket has a < a target = "_ blank" href=" https://news.163.com/news/search?keyword=%E5%8A%A9%E6%8E%A8%E5%99%A8 "> booster < / a > is not the same as the other three. It has two more bars and a yellow hat on its head. How is it different from other boosters The answer is revealed < p > the second booster is equipped with parachute < a target = "_ blank" href=" https://news.163.com/news/search?keyword=%E8%90%BD%E5%8C%BA "> landing area < / a > control system < p > when the "hat" is opened, the parachute will pop up to let the booster return to the ground steadily < p > the characteristics of this parachute landing of booster: < / P > < p > the landing area of rocket debris: the ability to reduce the landing area to 30% < / P > < p > parachute system: the largest mobile parachute system in China (300 square meters) < a target = "_ blank" href=" https://news.163.com/news/search?keyword=%E7%BF%BC%E4%BC%9E "> parafoil < / a > < / P > < p > Hu Wei, deputy chief designer of 3A series launch vehicle, President of rocket, introduced that every time the launch, the designer will calculate the landing area of each sub stage according to the rocket trajectory, and carry out the landing area safety control work accordingly. Sometimes, in order to ensure the predetermined landing area, the rocket < a target = "is modified_ blank" href=" https://news.163.com/news/search?keyword=%E9%A3%9E%E8%A1%8C "> flight < / a > trajectory, timing, resulting in reduced carrying capacity. Although the frequency of rocket sub stage landing area is not high, how to narrow the landing area as much as possible and reduce the interference to the normal production and life of the landing area has always been the goal of scientific researchers The significance of parachute landing area control system is here < p > controlling the landing point of the rocket booster is more accurate < / P > < p > the landing area of the sub stage debris of the launch vehicle launched from the inland launch site is safer < / P > < p > reciprocating miscellaneous points said: < / P > < p > Zhang Yipu, general deputy director designer of the 3A series launch vehicle, President of the rocket, introduced that the parachute landing area control system is installed inside the booster cone, and the booster flies along the upward parabolic inertia after separation from the rocket, When the parachute falls to the predetermined altitude, the control system of the parachute landing area starts, and two parachutes are ejected successively for attitude control and speed reduction. Finally, the Controllable Parafoil maneuvers to guide the parachute to the predetermined area for landing, so as to realize the precise control of the landing point of the rocket booster < p > to put it directly: this system is excellent, and can realize the accurate landing of the debris of the rocket sub stage < p > What does this mean? Remember parachute, wreckage, accuracy and safety < p > breakthrough in three key technologies < / P > < p > the success of this carrying flight, designers broke through the overall design technology of parachute landing area control < / P > < p > overall design technology of large area Controllable Parafoil < / P > < p > integrated navigation technology under high dynamic < / P > < p >... < / P > < p > the first time in China and the first time in the world < / P > < p > introduction of Zhang Puzhuo, general designer of parachute control system of rocket Academy, In the past, parachute landing area control technology was mostly used in the aviation field. For rocket booster, it is quite difficult to realize the safe structure separation, safely open the parachute and keep the parachute from being damaged under the condition of unstable attitude after separation < p > in this chang-3b rocket mission, the launch verification of booster landing area control flight based on 300 square meters Controllable Parafoil in China was completed for the first time. After the separation of the booster and the core stage, the continuous positioning of satellite navigation under high dynamic condition is realized, and various key actions are performed at the predetermined altitude. Finally, under the action of Parafoil, it flies to the target maneuver point according to the predetermined homing strategy, and the test is a complete success According to Hu Wei, this is also the heaviest rocket separation body in the world that successfully returns to the sea with parafoil control, and all flight data of the landing area control system are obtained in the test, which provides important reference for the engineering application of parachute landing area control technology and the improvement of the safety of rocket debris landing area The parachute control system of the booster was developed by the general design department of the rocket academy, and the parachute system was developed by Beijing Space Electromechanical Research Institute. In the aspect of landing area control technology of rocket separation body, the rocket academy has successively broken through the one stage grid rudder landing area control technology and booster parachute landing area control technology, which has laid an important technical foundation for the realization of new technologies such as controlled recovery and vertical return of sub stage in the future < p > editor in charge: Yu Qiuyu < / P > < p > <-- EndFragment-->