Abstract: Recently, the Infinite Element Method (IEM) is applied to the acoustic field analysis gradually. In this paper, basic theory of IEM is studied; the advantages and disadvantages of BEM (Boundary Element Method) and IEM are compared. The factors related to convergent precision of IEM are analyzed. Several important parameters and concepts of IEM, including the origin of coordinate system, the order of IEM, and vectors of coordinates, are introduced. The conclusions of IEM are presented for acoustic field analysis.

Key words: acoustics, infinite element, boundary element, finite element, acoustic field

摘要： 无限元法在声场分析中逐渐开始应用，本文研究了声场分析的无限元法的基本理论，比较了边界元法与无限元法的优缺点，分析了无限元法收敛精度的相关因素，通过对无限元法在结构外声场分析中实际应用的几个相关参数的计算，主要包括坐标原点的选取、无限元阶数、坐标矢量的定义等，总结了无限元法应用时重要参数的几条规律，对无限元法在声场分析领域的应用推广具有一定的理论与实用价值。

关键词: 声学, 无限元, 边界元, 有限元, 声场