国产欧美精品一区二区,中文字幕专区在线亚洲,国产精品美女网站在线观看,艾秋果冻传媒2021精品,在线免费一区二区,久久久久久青草大香综合精品,日韩美aaa特级毛片,欧美成人精品午夜免费影视

In order to predict the landing point of the debris of a space vehicle when it is launched at sea, it’s necessary to build a set of impact point calculation model with high accuracy and high efficiency. After analyzing the trajectory characteristics of the wreckage, the direct relationship between the air drag coefficient and the height and velocity is found by means of subsection fitting, which better reflects the movement of the wreckage in the atmosphere based on the position and velocity when the vehicle and the wreckage are separated. A series of equations are established by using the principle of dynamics, and the trajectory of the wreckage is obtained by integration. The absolute error and relative error are calculated and compared with other similar models. It’s proved that this model for landing point is in a balanced position to accuracy, efficiency and economy, and has practical value in a space vehicle launch mission.