基于LS-DYNA和HyperMesh的某型飞机垂尾翼尖前缘鸟撞分析

飞机的鸟撞事故是一种突发性和多发性的飞行事故,轻则飞机受损,重则机毁人亡.在飞机设计过程中,为了通过严格的适航条例,需要进行大量的鸟撞试验.随着有限元理论和计算机软、硬件的发展,利用计算机仿真技术进行飞机结构的抗鸟撞设计分析可以减少试验数量或者加强试验针对性,提高试验效率.基于LS-DYNA软件和前处理软件HyperMesh,利用光滑粒子法（SPH）与有限元耦合算法,采用带失效模型的短梁单元模拟铆钉失效,对某型飞机垂尾前缘进行鸟撞分析.通过对应力和位移结果的分析以及对沙漏能的有效控制,表明本文提出的建模方法具有满足工程要求的准确性,符合适航条例的规定.

Bird-Strike Analysis for Vertical Tail LE Structure of a Certain Type of AircraftUsing LS-DYNA and HyperMesh

Bird strikes cause hundred million dollars in damage to civilian and military aviation each year. In order to reduce the cost of validation tests and improve the efficiency of aircraft design, CAE technique is introduced to perform bird-strike analysis. A reliable FEM model is built up to simulate the bird-strike process on vertical tail LE structure of a certain type of aircraft in HyperMesh environment. SPH algorithm is employed since it is more efficient tracking of material deformations and history dependent behavior than Euler bird model. And a beam type spring element with failure model material is employed to simulate the riveted joints. The numerical result based on finite element coupling and SPH algorithm using LS-DYNA software indicates that the structure meets the requirement of the civil aviation regulation and that the method and the calculation model are reliable.