降落伞开伞是个复杂的工作过程，在很短的时间内，物全系统的相对位置都会发

Parachute opening is a complicated work process. In a short period of time, the relative position of the whole system will be rapidly infected. Therefore, accurate calculation of the parachute opening process is the difficulty of parachute design. With the development of fluid-structure coupling technology It makes it possible to use numerical calculation methods to replace conventional test methods, but it is difficult and time-consuming to directly use fluid-structure coupling to solve the parachute opening process, especially for large-scale parachute systems, which requires a large amount of calculation, low feasibility, and is not easy to implement in engineering. . At present, most of the parachute opening process engineering adopts the complete empirical method and the semi-empirical semi-theoretical method. The inflation time method is a semi-empirical and semi-theoretical method that uses the inflation time as the independent variable to calculate the trajectory and opening force of the whole system during the parachute opening process. This method is simple and convenient to calculate, can quickly guide the design and delivery of the parachute, and has great practical value in engineering. The calculation results of the project reflect the opening characteristics of the parachute, and the consistency of the test results is good.

Parachute opening is a complex working process, in a very short period of time, the relative position of the whole system will be sharply affected, so the accurate calculation of the opening of the parachute process is the difficulty of parachute design, with the development of fluid-solid coupling technology makes it possible to use numerical calculation method instead of conventional test methods, but the direct use of fluid-solid coupling method to solve the parachute opening process is difficult, time-consuming, especially large parachute system, computation is extremely large, low feasibility, engineering. At present, most of the parachute opening process engineering uses the fully empirical method and the semi-experienced semi-theoretical method. The inflatable time method is a semi-experienced and semi-theoretical method of calculating the system-wide trajectory and opening force of the open umbrella process based on the inflatable time argument. This method is simple and convenient to calculate, can quickly guide the design of parachute delivery, in engineering has great practical value, and the visual calculation results are very good embodiment of the parachute opening characteristics, and the consistency of the test results is good.

Parachute opening is a complex work process. In a very short time, the relative position of the whole system will occur rapidly. Therefore, it is difficult to accurately calculate the parachute opening process. With the development of fluid structure coupling technology, it is possible to replace the conventional test method with numerical calculation method. However, the method of fluid structure coupling is directly used to solve the problem The process is difficult and time-consuming, especially for the large parachute system, the calculation is huge, the feasibility is low, and it is not easy to realize in engineering. At present, the parachute opening process engineering mostly uses the complete empirical method and the semi empirical semi theoretical method. The inflation time method is a semi empirical and semi theoretical method to calculate the trajectory of the whole system and the parachute opening force with the inflation time as the independent variable. This method is simple and convenient for calculation, and can guide the parachute design and replacement quickly. It has great practical value in engineering. The results of calculation well reflect the parachute opening characteristics and have good consistency with the test results.<br>