科研之友
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摘要
The clash between flying birds and airplanes frequently results in damage of aircraft structures which could even lead to aircraft crash and death of crew members in the most disastrous cases. Investigation on the windshield resistance to bird impact is therefore crucial to ensure the safe flight of high-speed low-altitude military aircraft. Based on the experimental observation of bird impact on aircraft arc windshields, a computational model of an arc windshield and bird for a certain type of aircraft made in China is established. Issues on the arc windshield impacted by birds are studied using smoothed particle hydrodynamics (SPH) and the finite element method (FEM) provided by LS-DYNA3D.Results including the deformation, displacement and strain of the arc windshield are obtained through numerical simulation, which agree well with the experimental data. More useful conclusions, such as the impact force history curve and stress history curve under impact velocities in the range of 500-650 km/h, the critical impact velocity which can lead to damage of the windshield, possible damage locations and modes of the windshield after impacted by birds, are drawn from the numerical simulation. Finally, a comparison of the arbitrary Lagrange Euler (ALE) and element free Galerkin (EFG) methods with the SPH for bird impacts verifies that the SPH method is feasible and efficient for analyzing bird impact problems. The research results can provide valuable data for the design and manufacture of reliable windshields.
