In the year 2012, there were 10,726 bird strikes worldwide, as per a Federation for Aviation Administration (FAA) report. This indicates the need for certifying aircraft structures for bird strike using accurate simulation and testing. There are multiple approaches available to model the physics of bird strikes such as Coupled Eulerian Lagrangian (CEL), Smooth Particle Hydrodynamics (SPH) and pure Lagrangian methods. However, in a business scenario marked by time and resource constraints, it is often challenging to determine the right approach for a defined purpose in various design phases. Through a comparison of alternative methods, we propose a first of its kind Bird Strike Simulation Index (BSSI) based on key parameters like FEM setup time, run time, and accuracy of pressure and deflection. BSSI provides holistic guidance for industrial users.
Most bird-strike simulation uses idealized fastener modeling of metallic riveted panels. This affects the prediction of failure behavior of components attached in an assembly due to micro level embrittlement around the fastener hole. This whitepaper attempts to compare the bird strike methods and propose a simple and easy to implement an approach to efficiently model fasteners.
