【摘要】 边界元法应用于抗性消声器消声特性的三维分析计算.使用平面四角形单元离散边界表面,对奇异积分采用极坐标变换法消除奇异性,在棱边角点处区分不同方向的质点振速.文中对具有错开进出口管的矩形膨胀腔消声器的传递损失进行了计算,并与一维理论、解析法及有限元法计算结果进行了比较.更多还原

【Abstract】 The BEM is applied to calculating acoustic characteristics and analyse threedimentional effect of reactive mufflers.The planar quadrangular element is used to discretize boundary surface.The integral singularity can be elimited by using polar coordinate transformation method.The different partical vibrating velocities are supposed at points of corner.The transmission loss of "offset-inlet offset-outlet" square chamber has been calculated and compared with results obtained by means of one-dimensional theory and finite element method..更多还原