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

被引：0
|
作者：
Mou E. [1 ]
Gao F. [2 ]
Wang Z. [2 ]
Xiao P. [2 ]
Feng Z. [1 ]
Xie J. [1 ]
机构：
[1] Science and Technology Innovation Research Institute, Civil Aviation University of China, Tianjin
[2] College of Safety Science and Engineering, Civil Aviation University of China, Tianjin
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2024年 / 43卷 / 01期
关键词：
civil aircraft section; numerical simulation; structure impact response; water-entry impact test;
D O I：
10.13465/j.cnki.jvs.2024.01.035
中图分类号：
学科分类号：
摘要：
Here, to study vertical water-entry impact characteristics of typical fuselage section of civil aircraft, firstly, a water-entry impact test system was used to conduct water-entry impact tests for cylindrical bodies at different heights, study their water-entry impact responses. Secondly, based on LS-DYNA arbitrary Lagrange-Euler (ALE) method, a fluid domain uniform mesh model and a fluid domain locally refined mesh model were established. Mesh convergence and fluid domain models were verified by comparing the results of cylinder water-entry impact tests. Finally, based on the verified fluid domain models and fuselage section model, water-entry impact characteristics of fuselage section at a speed of 6. 02 m/s were studied, and differences between the former and its impact characteristics against rigid ground were analyzed, impact response characteristics of fuselage section at different water-entry impact velocities also were studied. The results showed that ALE method has higher simulation accuracy in structural water-entry impact, using fluid domain locally refined mesh model can greatly reduce mesh number of fluid domain model and calculation time for water-entry impact; the failure mode of fuselage section during water-entry impact is more consistent with that of fuselage section impacting rigid ground, but the overall deformation degree of fuselage frame structure decreases, while the deformation degree of cabin floor crossbeam increases; fuselage frame is still the component with the highest energy absorption, but water also absorbs a large amount of impact energy to make acceleration at floor guide-rail be always less than that during section impacting rigid ground; with increase in water-entry impact speed of fuselage section, fuselage frame' s bending and up warping degree increases. © 2024 Chinese Vibration Engineering Society. All rights reserved.
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页码：397 / 307
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