摘要
结合有限元法和边界元法，对某火电厂轴流式风机的本体及进／出气管道进行了声一振仿真，分析其声辐射场的特点。首先，用Pro／E软件建立风机进／出气和本体管道的三维实体模型，并用ANSYS进行网格划分后再导入SYSNOISE中建立其声场分析的边界元模型。其次，在400～700Hz范围内进行结构有限元谐响应分析，得到管道表面振动速度作为边界元分析的边界条件。最后，采用间接边界元法计算场点声辐射强度，仿真结果分析表明：在650Hz附近的声压最大；各场点的转折频率接近；不同场点的声压随频率的变化趋势基本相同。
The finite element method （FEM） and boundary element method （BEM） are combined to perform noise - vibration simulation of the air - intake and air - exhaust pipe of an air - flow fan. First,the 3D model built in Pro/E was forwar- ded to FEM software ANSYS to generate elements meshing. Then the mesh mode was forward to SYSNOISE to get its BEM model. Secondly the structure harmonic response during 400 - 700 Hz was simulated in ANSYS to get surface vibration velocity for BEM boundary conditions data. Indirect BEM method was adopted to calculate acoustic radiation noise intensity of the air- intake and air- exhaust pipe. The results show that. the maximum sound pressure occurs around 650 Hz; the corner frequencies of all field points are nearly the samel the trend of different field points at same frequency bands are similar.
出处
《机械与电子》
2009年第9期32-35,共4页
Machinery & Electronics
