计算物理 ›› 1993, Vol. 10 ›› Issue (4): 467-470.

• 论文 • 上一篇    下一篇

具有线性温度梯度的管道及消声器声学特性的边界元法计算

季振林, 张志华, 马强   

  1. 哈尔滨船舶工程学院动力工程系, 哈尔滨 150001
  • 收稿日期:1992-05-29 修回日期:1993-03-15 出版日期:1993-12-25 发布日期:1993-12-25

APPLICATION OF THE BOUNDARY ELEMENT METHOD TO CALCULATING ACOUSTIC CHARACTERISTICS OF DUCTS AND MUFFLERS WITH A LINEAR TEMPERATURE GRADIENT

Ji Zhenlin, Zhang Zhihua, and Ma Qiang   

  1. Haerbin Shipbuilding Engineering Institute, Haerbin 150001
  • Received:1992-05-29 Revised:1993-03-15 Online:1993-12-25 Published:1993-12-25

摘要: 采用摄动法将具有线性温度梯度介质中的声传播方程化为Helmholtz方程,然后用边界元法进行计算。由边界元法计算出消声器的四极参数,从而预测传递损失等消声量。文中计算了直管段的四极参数及膨胀腔的传递损失,并与一维理论结果进行了比较。

关键词: 边界元法, 摄动法, 消声器, 声学特性, 温度梯度

Abstract: Bu using the perturbation method, the sound wave propagation equation in the medium with a linear temperature gradient is simplified into Helmholtz equation, which can be computed numerically with the boundary element method. The four-pole parameters of muffler can be obtained using BEM, therefore the acoustic characteristics such as transmission loss can be predicted. The four-pole parameters of a straight duct and transmission loss of an expansion chamber have been calculated and compared with the results obtained by means of one-dimensional theory.

Key words: Boundary element method, Perturbation method, Muffler, Acoustic characteristics, Linear temperature gradient