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Crashworthiness study on hybrid energy absorbers as vertical struts in civil aircraft fuselage designs

机译:混合能源吸收剂的耐火性研究在民用飞机机身设计中的垂直支柱

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This research concerns the crashworthiness study and enhancement of commercial aircraft fuselage structures by incorporating crushable hybrid energy absorbers to work as vertical struts. To assess their contribution on a representative aircraft structure, a numerical simulation of a Boeing 737-200 drop test is developed and validated with experimental data available in the literature. The fuselage section is then simulated both with and without the fuel tank, showing more harmful effects for the latter scenario. The numerical model accurately captures the experiment's collapse process with low artificial energy ratios. Later, four vertical hybrid energy absorbers designed for programmed and progressive collapse, are added in the cargo compartment, connecting the underfloor beams and the frames. Different designs and positions are studied, combining aluminum tubes with square and circular cross-sections, filled with a core made from a GFRP skeleton and foam extrusions. Acceleration graphs show a reduction in passenger injury levels from severe to moderate according to an Eiband diagram when energy absorbers are fitted. Energy trends from the hybrid absorbers are also monitored, with dissipation of up to 10 kJ of the fuselage's kinetic energy through plastic deformation and collapse. Results also show a significant improvement on the global crashworthiness of the fuselage, leading to an increase in plastic dissipation by the frames from 76 kJ to 122 kJ and a reduction on the accelerations up to 50% when the energy-absorbing structures are added.
机译:本研究涉及通过掺入可抵抗力的混合能量吸收剂作为垂直支柱而使用可抵抗力的混合能量吸收剂进行耐火性研究和商用飞机机身结构。为评估其对代表性飞机结构的贡献,开发了一个波音737-200滴测试的数值模拟并验证了文献中可用的实验数据。然后在没有燃料箱的情况下模拟机身部分,对后一种情况显示出更有害的影响。数值模型准确地捕获实验的崩溃过程,具有低人工能量比。之后,在货舱中添加了四种垂直的混合能量吸收器,用于编程和逐渐崩溃,连接下层梁和框架。研究了不同的设计和位置,将铝管与方形和圆形横截面组合,填充有由GFRP骨架和泡沫挤压制成的芯。加速图显示,当安装能量吸收剂时,根据EIBAND图,乘客损伤水平的乘客损伤水平降低。还监测了混合吸收剂的能量趋势,通过塑性变形和塌陷,耗散多达10kJ的机身动能。结果还表现出对机身的全球崩溃性的显着改善,导致从76 kJ到122kj的框架增加塑料耗散,并且在加入能量吸收结构时,加速度高达50%的加速度增加。

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