不同冲击条件对机身结构适坠性的影响

针对某型飞机FS380到FS500确定机身段,研究了不同冲击条件对机身结构动态响应特性的影响。建立了机身试验段的等比简化有限元模型。分析了0滚转角、带有10°左滚转角以及带有纵向加速度的情况下,垂直坠撞速度v=9.133 m/s时的冲击特性。对比分析了各种情况下机身框段的变形情况和座椅位置处的加速度-时间历程曲线。结果表明:冲击条件的改变会对机身结构的变形以及座椅处加速度的变化产生影响:左滚转角的出现会改变机身的变形量以及峰值加速度的出现时间,纵向冲击的加入会增加地板的变形量但会有限地减小座椅处的峰值加速度,采用合适的应急着陆方式能提高飞机的耐坠毁性能。

Influences of Different Impact Conditions on Aircraft Fuselage Crashworthiness

A typical airplane fuselage from FS380 to FS500 is utilized to study the influences of different impact conditions on fuselage crashworthiness.The finite element model of the fuselage structure is established and the crashworthiness characteristics are simulated when v=9.133 m/s under the condition of 0 roll angle,10° left roll angle,and with horizontal acceleration separately.The overall deformation and the acceleration history curves at seats are compared.The results show that the left roll angle changes the fuselage deformation and the acceleration at seats obviously,while the deformation of the floors increases and the acceleration at the seats decreases when the horizontal acceleration is considered.A suitable emergence landing conditions can increase the aircraft crashworthiness.