基于有限元法的转子叶片裂纹故障特征研究

Fault Feature Research of the Rotor Blade Cracks Based on Finite Element Method

为了更接近工程实际,真实地反映叶片裂纹故障特征,采用CAD软件建立了转子叶片的三维实体模型,通过有限元分析软件ANSYS对裂纹叶片分别进行了模态和瞬态响应分析。结果表明:裂纹的存在导致叶片的固有频率下降,深度相同时,裂纹位于叶根对固有频率的影响最大;同时裂纹的存在引起振动响应的非线性特征。这就为转子叶片裂纹故障的监测与诊断提供了依据。

In order to close the project reality and really reflect the fault feature of the blade cracks, the 3D solid model of rotor blade was established through the CAD software. The modal analysis and transient response were done respectively through finite element analysis software ANSYS to the crack blade. The results indicate that the existence of the crack causes the nature frequency of blade to drop. The cracks located in the root of blade have the greatest influence to nature frequency, when the cracks have the same depth. The existence of crack causes the nonlinear feature of vibration response.