| 排气消声器性能的数值模拟 |
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| 引用本文： | 陆森林,刘红光,曾发林,陈士安.排气消声器性能的数值模拟[J].农业机械学报,2006,37(7):45-48. |
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| 作者姓名： | 陆森林 刘红光 曾发林 陈士安 |
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| 作者单位： | 江苏大学汽车与交通工程学院 |
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| 摘 要： | 用三维有限元法计算出消声器的四端子参数,利用所求得的四端子参数计算消声器的性能,克服了由高次波影响和一维理论计算公式在高频区计算不准确造成的缺陷。利用上述方法,分别对截面形状、端部形状和进出气管位置不同的多种扩张式消声器性能进行了数值模拟。结果表明,扩张室为圆形截面的消声器性能优于椭圆形和矩形截面消声器;扩张室端部形状不仅影响消声器传递损失的大小,还影响到传递损失的变化周期;当进出气管之一与扩张室轴线偏离一定距离时,可有效地提高消声器的消声频率,改善消声性能。
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| 关 键 词： | 消声器 声学性能 有限元法 数值模拟 |
| 收稿时间： | 02 21 2005 12:00AM |
| 修稿时间： | 2005年2月21日 |
Numerical Study of Acoustic Performance of Exhaust Muffler |
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| Lu Senlin,Liu Hongguang,Zeng Falin,Chen Shian.Numerical Study of Acoustic Performance of Exhaust Muffler[J].Transactions of the Chinese Society of Agricultural Machinery,2006,37(7):45-48. |
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| Authors: | Lu Senlin Liu Hongguang Zeng Falin Chen Shian |
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| Institution: | Jiangsu University |
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| Abstract: | The effects of geometrical parameters, such as section profiles, the offset of inlet and outlet, etc, on the transmission loss (TL) of muffler are investigated numerically by using 3-D acoustic finite element method (3-D FEM). The simulation results reveal that for a given expansion ratio, the acoustic performance of a simple expansion muffler with circular section is superior to those with elliptical and square section in terms of muffler effectiveness in the frequency range beyond the cut-off frequency. Furthermore, the geometrical ending-profile of an expansion chamber has an influence on both frequency period and amplitude of TL. The appropriate offset of inlet and outlet of an expansion muffler can increase its working frequency range. The findings presented in this paper can be used as a design guideline for a high performance muffler. |
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| Keywords: | Muffler Acoustic performance Finite element method Numerical simulation |
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