主变压器风道的谐响应分析

Harmonic Response Analysis of Main Transformer Air Duct

采用有限元法对主变压器风道进行模态与谐响应分析,得出了主变压器风道的位移与应力-时间响应值;发现主变压器风道的一阶垂向弯曲振型使风道底板产生较大应力,是导致主变压器风道产生局部裂纹的根源;根据仿真结果,通过改进主变压器风道的刚度分布,使主变压器风道的一阶垂向弯曲固有频率远离车体的垂向加速度振动频率,可避免风道产生共振现象。

The mode and harmonic response analysis of main transformer air duct are carried out by using the finite element method,and the time response values of displacement and stress of main transformer air duct are obtained.It is found the first order bend mode in the perpendicular direction could generate larger stress,resulting in the local crack the in the air duct of main transformer.In order to avoid the air duct resonance.the stiffness distributing of main transformer air duct is ameliorated based on simulation analysis,making the frequency of main transformer air duct is apart from the perpendicularity direction acceleration vibration frequency.