Abstract:

In this paper, a dynamic model is built for a certain type of ejection seat which takes into consideration the impact of wind speed in the ejection process. Different wind speeds and directions as well as different ejection velocities are selected as the state of the computation numerical simulation of the ejection process is performed, and then the impact of wind on the escape performance of the ejection seat is analyzed according to the numerical simulation results. By an analysis of the impact of front wind, lateral wind, and atmospheric vertical motion on the ejection seat respectively with low and medium velocities, the paper reveals that: greater headwinds will not only reduce the trajectory height of the canopy inflation process, but also engender oscillation and swing of the man-parachute system, thus impacting safe escape; the vertical movement of the atmosphere directly affects the vertical trajectory of the system and it is the greatest influence on the escape performance of the ejection-escape system. The results show that headwind, lateral wind and atmospheric vertical motion all have a negative influence on the escape performance of an ejection seat, and the actual ejection process must take into consideration the impact of wind speed on the ejection performance.

Key words: ejection seat, atmosphere motion, wind speed, numerical simulation, escape performance