Study of Bird Strikes Using Smooth Particle Hydrodynamics and Stochastic Parametric Evaluation

One of the major threats to aviation safety is the in-flight impact of birds. Aircraft windshields are highly vulnerable to damage and hence need a certification for a proven level of impact resistance. Bird-strike experiments are expensive; therefore, explicit numerical modeling techniques are particularly important for the study of this problem. This research relies mainly on the theory of hydrodynamic impact and addresses basic shock-wave equations. It uses a smooth particle hydrodynamics approach and conducts a numerical simulation using a contact- impact coupling algorithm. The finite-element model has been verified by comparison with available experimental findings. Additionally, the work adopts a design-of-experiments approach, factorial design, to predict economically the factors that significantly affect the pressure response in bird-strike analysis. The parameters investigated include impact velocity, bird mass, bird aspect ratio, porosity, and obliquity of impact. The results show that the velocity of impact and the interaction between porosity and obliquity have the greatest pressure response in a bird-strike analysis.