Vibration and noise test was done in specifically designed lab,which shows 36 order electromagnetic noise is a significant component of the noise of vehicle generator at middle and low speed.While an accurate simulation model and modals is the prerequisite for electromagnetics,structural harmonics and acoustics coupled simulation.Modal characteristics was obtained from modal test based on a type of a stator of vehicle generator.the stator core structure were established according to size of stator punching sheet,and established four simplified models according to the structure of coils and stator core.The computational resuhs by means of the finite element software ANSYS were compared with the experimental resuits,then the most realistic model was selected.The 36 order electromagnetic noise comes from stator vibration according to results of experiment and simulation.Structure optimization was completed and the results show the stator's modal characteristics were effectively improved.%通过振动噪声台架测试,发现发电机在中低转速下的36阶次电磁噪声问题突出.因此,定子结构的准确建模及结构优化是电磁振动噪声分析和控制的基础.首先对汽车发电机的定子进行自由模态试验,得到模态参数.建立定子冲片的整体式铁心模型后,采用等效法对线圈进行简化并建立4组定子模型.利用ANSYS软件对所建立的模型进行模态仿真,对比试验结果确定了定子的建模方法.模态结果和噪声试验显示,36阶次电磁噪声是由定子的共振导致.对定子铁心模型进行结构优化,结果表明,定子的模态特性得到了有效的改善.
展开▼
