ANALYSIS OF FOREIGN OBJECT IMPACT ON AIRCRAFT

Birds are threat to aircraft, not all but almost. Some birds lead to serious accidents involving aircraft of classes. Bird strike damages a lot, economically and physically. The lives of the crew, passengers are at risk ultimately. Since 1988, over 200 people have been killed worldwide as a result of encounters with airborne animals usually birds. A homogenous bird model with a simplified geometrical shape is modelled. The reliability and authenticity of the bird model is validated by comparing the numerical result with experimental results of a real bird of similar mass impacting normally at an impact velocity of 116m/s onto a flat rigid panel of composite glass (windshield) and aluminium/Titanium (panel). The obtained numerical results are found to be comparable in terms of plastic strain, Von Mises and the bird trajectory. The modelling of bird strike using the Lagrangian Formulation is then investigated by modelling impact on an aluminium/Titanium body panel and on the Wind Shield of an Aircraft. The numerical results obtained from the formulation shows close conformity implying their appropriateness as alternative in the simulation of bird strike. Analysis is made based on the obtained numerical results. LS-Dyna and Ansys is used for impact analysis. However software like Hyper-mesh was used for pre-processing (Mesh) and CATIA was used for detailed modelling of the parts for analysis. The result strictly portrays the structural strength or the failure against the impact by a high momentum body obstruction in the flight. Suggestion is provided on the basis of analysis study for wind chill.