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Bird strike incidents cause significant flight safety threats to aircraft safety, resulting in certification requirements of "continued safe flight and landing" following specified types of high-energy bird impact. The higher impact velocities for bird strikes that tiltrotor aircraft must survive underscores the need to develop more capable, validated analysis techniques. This paper presents the state-of-the-art bird strike simulation methodology developed at Bell Helicopter, based on the multimaterial arbitrary Lagrangian-Eulerian and smooth particle hydrodynamics techniques. The constitutive parameters of the bird model are calibrated to correlate the hydrodynamic pressure with available test data. The validated bird models are subsequently applied to simulate bird impacts with the BA609 tiltrotor structures for the most load-critical test conditions. The analytical models are validated for multiple test cases with different design architectures. The developed analytical tool is capable of accurately predicting structural failure modes and deformation for aircraft subjected to highenergy bird strike impacts.

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