Impact Simulation of a Frangible Approach Light Structure by an Aircraft Wing Section.

摘要

Certain types of equipment, such as approach light masts and ILS antennas, need to be positioned close to runways at airports because of operational requirements. However, in case of emergencies during take-off or landing, they become obstacles to flight safety. Hence, the requirements for the design of such structures are stringent and seem contradictory: they need to be stiff during operation, and collapse easily during an impact by an aircraft. Such a characteristic is known as 'frangible.' A computer code has been developed to analyze the impact problem of a light aircraft wing colliding with a frangible approach light structure. This code was evaluated on the basis of a 3-dimensional model, representing such a structure, as produced by the Finish company EXEL. The numerical results were compared to full scale impact test results, provided by EXEL. The failure mode and the impact peak force were well predicted.