鸟撞击叶片时的载荷模型

为了预估叶片的鸟撞击响应 ,首先要建立鸟撞击载荷模型。为此 ,开展了以下研究工作 :运用高速冲击动力学理论分析鸟撞击的物理过程 ;进行鸟撞击载荷试验 ;采用计算机数值模拟分析鸟撞击载荷的各种因素对叶片响应的影响。在综合运用上述研究结果的基础上 ,本文从鸟撞击载荷的冲量与加载持续时间的确定、力—时间函数的选择以及载荷空间因素的确定三个方面论述了有关的方法与原则 ,供建立鸟撞击载荷模型时参照使用

LOADING MODELS FOR BIRD IMPACTING ON BLADES

In order to predict the blade response to bird impact,it is neccesary to establish the bird impact loading models at the first.For this purpose,the following research work has been completed:(1)Analyzing the physical process of the bird impact according to the theory of high-speed stroke dynamics,(2)accomplishing the loading experiments of the bird impact,and (3)studying the effect of the various factors of the bird impact loading on the blade response by means of computer numerical simulation.Based on the synthesis of the above research results,some methods and principles for the bird impact loading models are obtained.They are the method of determining the impulse and loading duration,the method for selecting the force-time function and the principles of determining the spatial factors of the loading including the load types,the loading location and the spatial distribution of the loads.These methods and principles are applicable to establishing the bird impact loading models.