Evaluation of Bird Load Models for Dynamic Analysis of Aircraft Transparencies

摘要

The objective of the program was to experimentally and analytically examine the range of applicability of existing bird loading models. The program consisted of two primary tasks; (1) the design of an experiment and the collection of experimental data for actual bird impact on a flexible target, and (2) the computation of the response to the experimental impact conditions using the MAGNA code and existing bird loading models. Projectiles made of bird simulant material were launched at specially designed aluminum targets at velocities in the range of 60 to 300 m/sec. Impacts were at angles of 90 (normal), 45, and 25 degrees for nominal bird weights of 77 and 560 grams. Time history of target out-of-plane surface displacement was measured for all impacts and strain gage data was collected for selected impacts. Calculated response data is compared to experimental data for selected impact conditions. It is demonstrated that good results can be obtained with an uncoupled loading model using a priori information to modify the loading model.