| 赵越喆,吴硕贤.小阻尼界面房间声传输函数和声脉冲响应函数的有限元素法[J].,2000,19(2):24-30 |
| 小阻尼界面房间声传输函数和声脉冲响应函数的有限元素法 |
| A finite element method for calculating the acoustic transmission function and the acoustic impulse response in a lightly damped room |
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| 中文摘要: |
| 有限元素法（ＦＥＭ）可用于以声波动方程为基础通过数值计算求解室内声场，适用于分析界面阻抗非均匀分布和复杂形状房间内声场的低频特性．本文首先介绍了小阻尼界面条件下室内声场简正方式、声衰变系数、混响时间的ＦＥＭ计算方法．在此基础上导出了房间内两点之间声传输函数和声脉冲响应函数的ＦＥＭ计算模型，并以矩形房间为例详细讨论了有关细节．本文所讨论的计算模型可以反映房间内不同的声源点、接收点位置上的声压频谱特性和脉冲响应的时间结构，如直达声、反射声等．该方法可用于研究声波在室内的传播规律及预测房间的低频声学特性，在厅堂音质设计、音质评价和噪声控制的实践中具有广泛的应用前景，是虚拟现实可听化研究的基础． |
| 英文摘要: |
| Finite Element Method is a useful tool in the analysis of low-frequency room acoustic phenomenon where the true wave nature of sound must be accurately modeled. The acoustic finite element equation for lightly damped rooms which was developed by A. Craggs[1.2] is listed in the first part of this paper .In the later part FEM is extended to calculate acoustic transmission function between two points, and also the acoustic impulse response. It is shown that the computer model successfully predicts the effects of the different source-receiver locations on amplitude-frequency spectrum. Also the model solution method does capture the effects of direct sound and the reflections. As an example, a full three-dimensional rectangular room has been modeled with details. |
| DOI：10.11684/j.issn.1000-310X.2000.02.007 |
| 中文关键词: 有限元素法(FEM) 小阻尼界面房间 声传输函数 声脉冲响应 |
| 英文关键词: Finite element method Lightly damped rooms Acoustic transmission function Acoustic impulse response |
| 基金项目:广东省自然科学基金 |
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