鸟撞击载荷的冲量与时间因素的确定

为了预估叶片对鸟撞击的响应，首先要建立鸟撞击载荷模型。为此，需要确定载荷的冲量、时间因素及空间因素。其中时间因素包括加载持续时间及力一时间函数。本文介绍了鸟撞击刚性靶体时，确定其冲量及加载持续时间的一种理论计算方法。按正撞击与斜撞击、含切割过程与不含切割过程分别导出计算公式，并根据某型号发动机的有关参数给出计算实例。文中还介绍了一种无量纲形式的力－时间函数。该函数形式简单，且综合了计算分析与实验测量两方面的结果。以上内容均可供建立鸟撞击载荷模型时参照使用。

The Determination of Impulse and Temporal Factor of Bird Impact Loads

In order to predict the blade response caused by bird impact, it is neccesary to establish the bird impact load model at firse, For this purpose ,it is neccesary to determine the impulse, temporal factor and special factor of loads. The temporal factor imcludes the loadinmg duration and the force-time function. A theoretical computation methodis introduced in this paper, This metholis used to determine the impulse of load and the loading duration for bird impacting on rigid targets. The computational formulae are shown resped-tively for following cases, i.e.,normal impact and oblique impact, with and without slicing process. The computational examples for some type of engine are shown at the same time.A force-time function which is in the nondimensional form is also introduced in this paper.The form of this function is simple, and it is a synthetic result of both computational analysis and experimental measurement .The research results mentioned-abore can be applied in ewtablishing the bird impact load models.