飞机圆弧风挡鸟撞动响应分析

BIRD IMPACT DYNAMIC RESPONSE ANALYSIS FOR AIRCRAFT ARC WINDSHIELD

采用等效动载荷法对某机圆弧风挡进行鸟撞动响应分析。着重考虑了应变率对透明件材料性能的影响和几何非线性对刚度矩阵的影响,并将计算结果与全尺寸鸟撞试验结果进行比较。得出了风挡位移在鸟撞击过程中的变化规律。结果表明:应变率对位移、应变影响较大,几何非线性对飞机风挡鸟撞动响应分析结果的影响不可忽略。

The bird impact on aircraft arc windshield is a complox problem of impact dynamics. The method of equivalent dynamic load is adopted to analyse the bird impact dynamic response for a trainer aircraft arc windshield. The effects of the strain rate on material characterization and the geometrical nonlinearity on the stiffness matrix are emphatically considered in the process of dynamic response analysis. The flexible target load which is suitable to arc windshield is given by studying the bird impact load. The result. of comparing the calculation results with the full scale bird impact tests shout-hat the structure deflection and strain responses are sensitive to the variation of the strain rate and geometrical nonlinearity of structure. The calculation results obtained by considering the effects of the strain rate and the geometrical nonlinearity of structure are in accordance with the test results.