对具有吸能子地板的全复合材料机身结构进行了垂直向7.9 m/s的抗坠毁数值模拟,得到平均加速度、速度及撞击载荷值等动态冲击参数,考虑采用不同的评价方法来评估其抗坠毁特性.并对全复合材料机身结构进行分块设计,考虑在冲击过程中起关键作用的底部结构中加入吸能泡沫,最后利用专业的瞬态动力学软件对有限元设计模型进行了冲击模拟,并与测试结果进行了比较,结果满足抗坠毁设计相应规范要求.计算得到的平均加速度不超过13g,其相对误差不大于11％,撞击载荷最大不超过6 kN,坠毁平均负加速度持续时间不超过0.03 s,结果较合理.利用本模型可以指导直升机的抗坠毁设计.
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