飞机风挡透明件的鸟撞分析

 本文研究了风挡透明件鸟撞动力响应的分析模型和方法。考虑了撞击载荷与风挡透明件动力响应的耦合作用和非线性效应。为了能方便地使用现有的非线性有限元分析程序并避免数值解的振荡现象,在研究中不采用常用的拉格朗日法和罚函数法,而是采用动量平衡法。同时,为了避免不断调整撞击接触点和修改网格,本文采用超弹性的橡皮材料来模拟鸟体,而不是象国外那样采用流体柱。研究和比较了衍生动载荷响应解,并提出相应的看法。

BIRD IMPACT ANALYSIS OF AIRCRAFT WINDSHIELD TRANSPARENCY

The modelling and analytic methods for the dynamic response of windshield transparency under bird impact are studied. The interaction between the impact load and the transparency response as well as the nonlinearity effect is considered. To employ conveniently the existing general purpose nonlinear finite element analysis programs, the momentum equilibrium method is used, other than the Conventional Lagrangian and penalty function methods. Meanwhile, instead of the incompressible fluid, a rubber-like hyperelastic Mooney-Rivlin material is suggested firstly to simulate the bird body in impact, thus the difficulty of continuously updating the contact point pairs and adjusting the discretized mesh during the analysis can be avoided. Remarks similar to those given in other published papers are concluded. In addition, a solution method for the dynamic response under the derivative dynamic load is studied and compared with the coupling solution, and consequent comments are given.