降落伞开伞是个复杂的工作过程，在很短的时间内，物伞系统的外形、质量及各

Parachute opening is a complicated process. In a short period of time, the shape, quality and relative position of each part of the parachute system will be rapidly infected. Therefore, accurate calculation of the parachute opening process has always been a difficult point in parachute design. The development of fluid-structure coupling technology 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 methods to solve the parachute opening process, especially for large-scale parachute systems, which is extremely computationally intensive and feasible Low performance, difficult to realize 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 to calculate the kinematics and dynamics of the parachute system during the parachute opening process with the inflation time as the independent variable. This method is simple and convenient to calculate, can quickly guide the design iteration of the parachute, and has great practical value in engineering. The calculation results of the project well 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 shape, quality and relative position of each part of the parachute system will be sharply affected, so the accurate calculation of the opening of the parachute process has always been a difficult point of parachute design, with the development of fluid-solid coupling technology makes it possible to use numerical calculation methods instead of conventional test methods, but the direct use of fluid-solid coupling methods to solve the parachute opening process is difficult, time-consuming, especially large-scale parachute system, the calculation is very low. 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-empirical and semi-theoretical method of calculating the motion and dynamics of the umbrella system of the open umbrella process based on the inflatable time argument. This method is simple and convenient, can quickly guide the design iteration of parachute, has great practical value in engineering, and the visual calculation results reflect the opening characteristics of parachute, and the consistency of the test results is good.

Parachute opening is a complex work process. In a very short time, the shape, mass and relative position of each part of the parachute system will change rapidly. Therefore, accurate calculation of parachute opening process has always been a difficulty in parachute design. With the development of fluid structure coupling technology, it is possible to use numerical calculation method instead of conventional test method, but it is possible to use fluid solid coupling method directly It is difficult and time-consuming to solve the parachute opening process by coupling method, especially for large-scale parachute system, the calculation amount 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 kinematics and dynamics of the parachute system during the parachute opening process. This method is simple and convenient, and can guide the design iteration of parachute 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>