为了对飞机驾驶舱后观察窗玻璃进行抗鸟撞设计,进行了后观察窗玻璃抗鸟撞试验,试验中测量了观察窗玻璃上两个点的应变时间历程。利用大型商用碰撞分析软件PAM-CRASH建立了全尺寸鸟撞后观察窗玻璃有限元计算模型,对鸟撞后观察窗试验过程进行了数值模拟,比较了应变及位移时间历程曲线的计算结果和试验结果,二者良好的一致性表明计算模型的合理性。在此基础上分析了内外层玻璃厚度及中间空气层厚度对后观察窗结构抗鸟撞动响应的影响规律,为飞机驾驶舱后观察窗玻璃的抗鸟撞设计提供技术指导。
In order to design rear observation window glasses of an aircraft cockpit under bird impacting,tests for bird impacting a rear observation window were conducted,the strain time histories of two points on the window were measured.A full-scale finite element model of bird impacting a rear observation window was established to simulate a test process using the large-scale commercial impacting analysis software PAM-CRASH.The results of strain and displacement time-histories achieved from simulations and tests were compared,the good agreement between them indicated that the numerical model established here is rational.Then,the effect laws of thicknesses of inner glass layer,outer glass layer and air layer between them on the bird-impact response of a rear observation window were analyzed.The results provided a technical guidance for anti-bird-impacting design of rear observation window glasses of an aircraft cockpit.