鸟体形状对飞机风挡鸟撞动响应的影响

Bird Shape Sensitivity to Dynamic Response of Bird Strike on Aircraft Windshield

目前,鸟撞动响应分析结果与试验结果不能很好地吻合。造成这个问题的原因有很多,如鸟体和风挡的本构关系、鸟体形状、风挡的破坏准则等。本文重点研究了鸟体形状对动响应的影响。在鸟撞动响应分析中,采用的鸟体形状主要有两大类:(1)圆柱体,(2)两端半球形、中间圆柱形的实体。本文分别采用解耦解法和耦合解法研究了这两种形状对风挡鸟撞动响应的影响,并与试验结果进行了比较。结果表明:用两种形状计算得到的应变曲线的变化趋势与试验结果都基本相符,但当飞机水平与鸟相撞时用第一种形状计算得到的风挡应变值小于用第二种形状计算得到的风挡应变值,用第二种形状计算所得的结果与试验结果更加吻合。

At present, numerical analysis results are not in agreement with the experimental results very well. There are many factors contributing to the inconsistency, such as material constitutive response of bird and windshield, bird shape and failure criteria of windshield, etc. The sensitivity of the bird shape to the dynamic response is studied. Two kinds of bird shapes are used in numerical analysis： a cylindrical shape and a right circular cylinder with hemispherical end caps. The sensitivities of two shape are studied with the decoupled and the coupled methods. Consequently, the analysis results show that the curvilinear trends of strain calculated with both of the two shapes are coincidental between numerical resuits and experimental data. But when the bird impacts on the aircraft horizontally, the windshield strain calculated by the former shape is less than the one calculated by the latter. And the result of the latter shape is in agreement with experimental data than the former.