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Parametric study of a SPH high velocity impact analysis - A birdstrike windshield application

机译：SPH高速冲击分析的参数研究-鸟撞风挡玻璃应用

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摘要

During its life cycle an aircraft flies on the risk of impacting foreign objects. According to the aeronautical specifications, the term "birdstrike" indicates the collision between a bird and an aircraft front facing component, which includes windshield, nacelles, compressor blade, wing leading edge or even flaps, when extended. This paper is part of a research focused on the study, with the help of finite element analysis, of an aircraft windshield-surround structure with an innovative configuration that satisfies the bird-strike requirement according to the European and US aviation regulations 25.631 on the "Bird-strike Damage" [1.21. Firstly the paper provides a numerical analysis of a simplified, but dimensionally realistic, square flat windshield model subjected to impact by a 1.8 kg bird model at 155 m/s with an impact angle of 90°. The FE-SPH coupled approach is used to simulate the birdstrike by using the explicit finite element solver code LS-Dyna. The second step involves a parametric analysis on the square model to estimate the influence of the target geometry, the impact angle, and the plate curvature on the impact response of the windshield structure. The goal of these numerical simulations is the evaluation of the windshield capability to absorb the impact energy of a birdstrike event, in a safe and efficient way which is compliant with the airworthiness rules. The aim of this work is to define a scientific and methodological approach to the study of the birdstrike problem. The collection of results and experiences achieved by the previous simplified realistic model can be applied to perform a certification test simulation and define possible guidelines for the design of a bird-proof airplane windshield.
机译：在其生命周期中，飞机飞行时有撞击异物的风险。根据航空规范，术语“鸟击”表示鸟与飞机前部部件之间的碰撞，当延伸时，该部件包括挡风玻璃，机舱，压气机叶片，机翼前缘甚至襟翼。本文是一项研究的一部分，该研究的重点是借助有限元分析对具有创新配置的飞机挡风玻璃周围结构进行了研究，该结构可以根据欧洲和美国航空法规25.631关于“鸟击伤害” [1.21。首先，本文提供了一个简化但尺寸逼真的方形平面挡风玻璃模型的数值分析，该模型受到1.8 kg鸟形模型以155 m / s的冲击角90°的冲击。 FE-SPH耦合方法通过使用显式有限元求解器代码LS-Dyna来模拟鸟撞。第二步包括对方形模型进行参数分析，以估算目标几何形状，冲击角和板曲率对挡风玻璃结构的冲击响应的影响。这些数值模拟的目的是评估挡风玻璃以符合适航规则的安全有效的方式吸收鸟击事件的冲击能量的能力。这项工作的目的是为研究鸟击问题定义一种科学和方法论的方法。由先前的简化现实模型获得的结果和经验的集合可用于执行认证测试模拟，并为防鸟飞机挡风玻璃的设计定义可能的准则。

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