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将气囊缓冲过程分解为绝热压缩和排气释能2个过程,从热力学和运动学方程出发,建立考虑降落伞阻力影响的缓冲气囊的解析分析模型。基于该模型,对立式气囊的缓冲特性进行研究。结果表明:降落伞阻力对缓冲性能有微小影响,在计算中可以忽略。在理论分析的基础上给出了系统质量与气囊初始体积比的最优值,探讨了排气口固定型与可控型气囊的缓冲特性及其应用优劣。
The airbag cushioning process is decomposed into two processes of adiabatic compression and exhaust gas release. Based on the thermodynamic and kinematic equations, an analytical model of buffer airbag considering the influence of parachute drag is established. Based on this model, the cushioning properties of vertical airbags were studied. The results show that parachute resistance has a slight effect on cushioning performance and can be neglected in the calculation. Based on the theoretical analysis, the optimum value of the initial mass ratio of the balloon to the initial volume of the balloon is given. The cushioning characteristics of the stationary and controllable balloon of the exhaust and its advantages and disadvantages are also discussed.