风对弹射座椅救生性能的影响

 针对某型弹射座椅建立了考虑风速的弹射过程动力学模型。选取不同风速风向和不同弹射速度作为计算状态,对弹射救生过程进行数值仿真,根据仿真结果分析风对弹射座椅救生性能的影响。通过在低速和中速两个弹射速度下,前向风、侧向风和大气垂直运动对弹射座椅救生性能影响的分析可知:较大的逆风不但会降低伞衣充满的轨迹高度,而且会产生人伞系统的振荡和摇摆,对安全救生存在一定的影响;大气的垂直运动对弹射救生系统的救生性能影响最大,它直接影响到救生系统的纵向运动轨迹。研究结果表明:前向风、侧向风和大气垂直运动均会对弹射座椅的救生性能产生不利影响,在真实的弹射过程中必须考虑风速对弹射救生性能的影响。

Impact of Wind on Ejection Seat Escape Performance

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.