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利用ANSYS/LS-DYNA非线性动力分析程序,对一种非对称结构飞机前风挡的鸟撞动态响应进行了三维数值模拟。计算得到非对称结构风挡内部单元的最大主应力、位移、应变等分布规律。与完整对称风挡相比,尽管撞击过程中非对称边缘处首先产生较高的应力值,接近0.8σmax,但持续时间短,并未造成材料破坏;这种非对称结构设计并不使鸟撞风挡临界速度产生明显的降低。另外,撞击点位置偏差对风挡鸟撞临界速度也有较大影响。
Using ANSYS / LS-DYNA nonlinear dynamic analysis program, the three-dimensional numerical simulation of the bird strike dynamic response of an asymmetrical front windshield was carried out. The distribution of the maximum principal stress, displacement, strain and so on of the asymmetric structure windshield interior unit is calculated. Compared with the complete symmetrical windshield, although the asymmetric edge of the impact process first produce a higher stress value, close to 0.8σmax, but the duration is short, did not cause material damage; this non-symmetrical structure design does not make the bird hit the windshield The critical speed is significantly reduced. In addition, the impact point position deviation on the windscreen bird collision critical speed also has a greater impact.