鸟撞击的载荷因素对叶片响应的影响

本文以矩形悬臂板模拟真实叶片,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。通过计算多个算例进行分组比较,分析了鸟撞载荷的冲量传递,加载持续时间,加载位置,载荷的空间分布等不同载荷因素对叶片响应的影响。为鸟撞击载荷过程的合理简化提供了依据。 

EFFECT OF SOME LOAD FACTORS OF BIRD IMPACT ON BLADE RESPONSE

The effect of some load factors of bird impact on blade response is analysed in this paper.These factors include momentum transfer,load duration,loading location,and spatial distribution of loads.The finite element method is used to compute the nonlinear transient response of the blade by means of simulating a real blade with a rectangular cantilever plate and simulating bird impact loads with shock loads.By computing and comparing the response of the cantilever plate to various load factors,the following conclusions can be obtained:The local and total deflection of the blade are directly proportional to momentum transfer to the blade.The load duration affects directly the deformation and stress states of the blade too.So the two parameters must be accurately predicted when a load model is developed.It is also very important to correctly predict the load location on the blade because the eccentric loads cause the greater deflection and twisting.The spatial distribution forms for distributed loads seem to have a little effect on blade response.The work which is conducted in this paper can provide the basis for the development of the bird impact load model.