封闭声场数值模拟系统SOFIS原理及设计

结合统计学方法，对模拟声场脉冲响应的算法进行了改进，使之可用于模拟非矩形空间，有障碍物或吸声体的封闭声场。在此基础上利用VisualC 语言和OpenGL图形软件包，研制了一个用于预测声场特性的计算机仿真系统SOFIS，该系统能在同一台计算机上完成声场建模，数值计算和输出结果等工作。论对一个建筑模型进行了仿真，同理论分析比较后可以得出结论，本系统在计算精度，适用范围和计算效率方面都有所改善。

Solution of Four Problems in Numerical Simulation of Enclosed Sound Field

In Ref., we developed a ray tracing algorithm for calculating the impulse response in enclosed sound field. Ref. did not solve four problems: (1) modeling complex enclosure, (2) calculating sound absorption by air, (3) calculating sound absorption by certain portion of wall that is much more sound absorbent than usual, (4)calculating the effect of sound barrier on sound propagation. Subsection 1.2 discusses in detail how to solve problems (1) and (4) (subsubsection 1.2.1) and problems (2) and (3) (subsubsection 1.2.2). Based on our solution of these four problems, we use Visual C++ and OpenGL to design a computer program which we call SOFIS(Sound Field Simulation). Simulation results for a numerical example, given in Fig.2 and Table 1, show preliminarily that SOFIS program can simulate the impulse response and acoustic indexes of defined points in a complicated enclosure.