救生伞背带分系统对假人动载的影响

Influence of webbing subsystem of survival parachute on the dynamic load of the dummy

为了改善救生伞背带分系统的安全性,建立降落伞-背带-假人系统的动力学模型,分析背带及脱离锁参数对假人质心过载的影响。针对救生伞假人高速开伞空投试验,采用多体动力学方法建立降落伞、背带脱离锁和假人的十五自由度动力学模型;采用半质量-阻尼弹簧模型建立背带模型,连接降落伞、脱离锁和假人;利用实测过载计算降落伞开伞力。利用所建立的动力学模型仿真典型状态下假人和背带的动力学响应,验证所建立模型的合理性。分析了脱离锁位置、背带松紧程度、背带材料特性对假人质心最大过载的影响,可用于指导背带设计以及确定最佳的背带脱离锁位置。

To improve the safety of the webbing subsystem of the survival parachute, the dynamic model of parachute-webbing-dummy system was developed, and the load of the center of mass of dummy was analyzed for the varied parameters of webbing and detachment lock. For the airdrop test of dummy in the high speed, the fifteen degree of freedom dynamic model for the parachute, detachment lock and dummy was developed by using the multi-body dynamic method. The webbing was modeled by semi-mass-damping model to join the parachute, detachment lock and dummy. The parachute opening force was calculated by using the load of test. The dynamic process of dummy and the webbing for the typical condition was simulated by using the proposed model, and the reasonableness of the model was verified. The effect of the load of the dummy mass center was analyzed for the position of detachment lock, the length of webbing, and the property of the webbing material. The results of the analysis can be used for the design of the webbing and the determination of the position of the detachment lock.