Impact Behavior of High Velocity Bird on a Flat Barrier

In transient dynamic analysis of soft body impact, the contact and target surfaces impact each other with nonzero relative velocities and momentum, energy balance and thermodynamic equilibrium need to be satisfied. This helps to more accurately predict the duration of impact. The aircraft structure absorbs impact energy due to ingested birds, ice balls or hail stone and hard body objects, etc. This paper deals with a sensitivity study of hydrodynamic bird models which is performed by numerical simulation. The analysis is carried out by using an explicit Finite Element Analysis (FEA) code AUTODYNE for impact of substitute birds on square plate of rigid aluminium. The bird body is modeled as a porous water-air material in the shape of a flat or hemi-spherically ended cylinder. The finite element bird modeling was carried out by the use of the Smooth Particle Hydrodynamics (SPH) method for materials of different porosity. The energy and momentum variations with time are achieved from different porosities of two bird models are presented.