Modelling of impact forces and pressures in Lagrangian bird strike analyses
Modelling of impact forces and pressures in Lagrangian bird strike analyses
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DOI：
10.1016/j.ijimpeng.2005.04.011
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发表时间：
2006-10
影响因子：
5.1
通讯作者：
A. Airoldi;B. Cacchione
中科院分区：
文献类型：
--
作者：
A. Airoldi;B. Cacchione
本文的目的是评估和提高精度的鸟撞数值分析与有限元显式代码，侧重于模拟的空间和时间的压力分布施加在目标上的冲击体。采用拉格朗日方法，接口的ESI/Pam碰撞求解器代码与自动试错程序，用于消除过度扭曲的元素。的理论制定有关的圆柱形软体对刚性目标的影响进行审查，并通过这种理想化的情况下，验证所提出的方法与日益完善的有限元方案。然后进行敏感性研究，采用不同形状的鸟模型，并改变材料的流体动力学和偏差响应。选择一组模型，将结果与实验平均值和文献中报道的最重要的加载参数对刚性目标的影响的散射进行比较。随后采用这些模型中使用的鸟材料的模型形状和校准参数的可变形的聚碳酸酯板上的影响的分析。越来越精细的鸟模型所获得的数值结果进行了介绍和讨论。最后提出了一系列的建模参数进行可靠的数值分析飞机结构和一个标准，提出了一个合理的保守的方法来设计防鸟结构的模型选择。
The paper aims at evaluating and improving the accuracy of bird impact numerical analyses performed with finite element explicit codes, focusing on the modelling of the spatial and temporal pressure distributions exerted on the target by the impacting body. A Lagrangian approach is adopted, interfacing the ESI/Pam-Crash solver code with an automatic trial-and-error procedure for the elimination of the excessively distorted elements. The theoretical formulation relevant to the impact of a cylindrical soft body against a rigid target is reviewed and this idealised case is adopted to validate the presented approach with increasingly refined finite element schemes. A sensitivity study is then carried out, adopting differently shaped bird models and varying the material hydrodynamic and deviatoric responses. A set of models is selected comparing the results with the experimental average values and the scattering reported in literature for the most significant loading parameters in impacts on rigid targets. The model shape and the calibration parameters of the bird material used in these models are subsequently adopted in the analyses of impacts on a deformable polycarbonate plate. The numerical results obtained with increasingly refined bird models are presented and discussed. A range of modelling parameters is finally suggested to perform reliable numerical analyses on aircraft structures and a criterion is proposed to select the models for a reasonably conservative approach to the design of a bird proof structure.