鸟撞击叶片时载荷因素的数值模拟分析

Load Factor Analysis for Bird Impacting on Blades by Numerical Simulation Method

鸟与叶片的撞击过程是一个复杂的加载过程。为了将其简化,以建立一个简单且合理的鸟撞击载荷模型,需要分析鸟撞击载荷的各种因素对叶片响应的影响。本文通过计算机数值模拟进行上述工作。以矩形悬臂板模拟实际叶片,以冲击载荷模拟鸟撞击载荷,采用有限元法计算悬臂板在冲击载荷下的非线性瞬态响应。从鸟撞击载荷的冲量、时间因索、空间因素三个方面分析了冲量、加载持续时间、力-时间函数、初始冲击压力、加载位置、载荷的空间分布以及载荷类型等七种因素对叶片响应的影响。本文得出的结论为合理简化鸟撞击加载过程及建立鸟撞击载荷模型提供了参考与依据。

The process of bird impacting on blade is a complicated loading process. In order to simplify the process,so as to establish the bird impact load model which is simple and reasonable,it is necessary to analyse the effects of various factors of bird impact load on blade response. This work is performed with the help of computer numerical simulation in this paper. The finite element method is used to compute the nonlinear transient response of blade by means of simulating a real blade with a rectangular cantilever plate ,and simulating bird impact loads with shock loads . About twenty examples are computed and analyzed. The analysis is conducted from three aspects,i, e. the impulse,the temporal factors,and the spatial factors. The seven load factors are impulse,load-duration,force-time function, initial shock pressure, loading location, spatial distribution of loads, and load type. The conclusions obtained in this paper may provide the basis for simplifying the bird impact loading process,and the reference for etablishing the bird impact load model.