民机典型机身框段垂直入水冲击特性研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (1) : 297-307.

论文

民机典型机身框段垂直入水冲击特性研究

牟浩蕾1，高飞2，王子龙2，肖培2，冯振宇1，解江1

作者信息 +

Vertical water-entry impact characteristics of typical fuselage section of civil aircraft

MOU Haolei1, GAO Fei2, WANG Zilong2, XIAO Pei2, FENG Zhenyu1, XIE Jiang1

Author information +

文章历史 +

摘要

为了研究民机典型机身框段垂直入水冲击特性，首先采用入水冲击试验系统开展不同高度下的圆柱体入水冲击试验，研究其入水冲击响应；其次基于LS-DYNA任意拉格朗日-欧拉（ALE）方法建立流体域均匀网格及局部加密网格模型，通过对比圆柱体入水冲击试验结果验证网格收敛性及流体域模型；最后基于验证的流体域模型及机身框段模型，研究机身框段在6.02m/s速度下的入水冲击特性，并分析与刚性地面冲击特性的差异性以及不同入水冲击速度下的机身框段冲击响应特性。结果表明：ALE方法在结构入水冲击方面具有较高的模拟精度，且采用局部加密网格时可以极大减少流体域模型网格数量和入水冲击计算时间。机身框段入水冲击时的失效模式与刚性地面冲击时的失效模式较为一致，但机身框段结构整体变形程度减小，客舱地板横梁变形程度增大；机身框仍是吸能最多的部件，但水也吸收了大量的冲击能量，使得地板导轨处的加速度始终小于刚性地面冲击时的加速度；随着机身框段入水冲击速度的增大，机身框发生弯折和上翘的程度加剧。

Abstract

To study the vertical water-entry impact characteristics of civil aircraft typical fuselage section, the cylinder water-entry impact test was firstly carried out by using the water-entry impact test system. Secondly, the uniform grid fluid model and locally refined grid fluid model were established based on the LS-DYNA ALE method, and were verified by comparing the water-entry impact test results. Finally, the water-entry impact characteristics of fuselage section at 6.02m/s were studied based on the verified fluid domain model and fuselage section model, the difference between water-entry impact characteristics and rigid ground impact characteristics, and the water-entry impact response of fuselage section at different speeds were further analyzed. The results show that the ALE method has higher accuracy for the structure water-entry impact simulation, and the fluid model grids numbers and the water-entry impact calculation time can be greatly reduced when using the locally refined grid fluid model. The water-entry impact failure mode of fuselage section is consistent with the rigid ground impact failure mode, but the overall deformation degree of fuselage section decreases, and the deformation degree of cabin floor beam increases. The frames are still the most energy-absorbing structural components, and a large amount of impact energy are absorbed by the water, resulting in the acceleration at the floor rail is always smaller. With the increase of the water -entry impact velocity, the degree of bending and upturning of fuselage frames increases.

导出引用

牟浩蕾1，高飞2，王子龙2，肖培2，冯振宇1，解江1. 民机典型机身框段垂直入水冲击特性研究[J]. 振动与冲击, 2024, 43(1): 297-307

MOU Haolei1, GAO Fei2, WANG Zilong2, XIAO Pei2, FENG Zhenyu1, XIE Jiang1. Vertical water-entry impact characteristics of typical fuselage section of civil aircraft[J]. Journal of Vibration and Shock, 2024, 43(1): 297-307

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