宽频带传输损耗双腔消声器的调谐

IF 0.8 4区工程技术 Q4 ACOUSTICS

International Journal of Acoustics and Vibration Pub Date : 2020-06-30 DOI:10.20855/ijav.2020.25.21666

M. Munjal

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引用次数: 4

摘要

宽频带传输损耗消声器的设计是汽车排气系统的基本要求，因为汽车排气噪声分布在发动机点火频率的几个谐波上。这导致了双调谐膨胀室的概念。本文将双调谐的概念推广到双腔消声器中。本文采用作者经典的速度比算法对该消声器进行了分析和设计。对相关的两行数组进行操作和简化，以直接从构成相关速度比的81个无维项中得出单个最重要的项。对这一单一术语的检查揭示了双调谐双室(DT2C)消声器与等效较长的双调谐单室消声器的TL频谱凸起宽带圆顶的声学效果。除低频槽外，其TL曲线覆盖了汽车尾气噪声控制所关注的整个频率范围。研究还表明，相应的侧进侧出(SISO) DT2C消声器配置与同轴消声器配置具有相同的宽带TL谱。最后，对DT2C消声器的设计提出了一些指导原则。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Tuning a Two-Chamber Muffler for Wide-Band Transmission Loss

The design of a muffler with wide-band transmission loss (TL) is a basic requirement for automotive exhaust systems where the exhaust noise is spread over several harmonics of the engine firing frequency. This has led to the concept of a double-tuned expansion chamber. In the present paper, the concept of double-tuning is extended to the two-chamber mufflers. The author’s classical Velocity Ratio Algorithm is used here to analyze and design such a muffler. The relevant two-row array is manipulated and simplified to arrive directly at the single most significant term out of the 81 non-dimensional terms constituting the relevant Velocity Ratio. Examination of this single term reveals acoustics of the raised wide-band domes of the TL spectrum of the double-tuned two-chamber (DT2C) muffler vis-a-vis that of an equivalent longer double-tuned single-chamber muffler. Except for a low-frequency trough, its TL curve covers the entire frequency range of interest for control of automotive exhaust noise. It is also shown that the corresponding side-inlet side-outlet (SISO) DT2C muffler configuration has an identically similar wide-band TL spectrum to that of the co-axial muffler configuration. Finally, some guidelines are laid out for designing a DT2C muffler.

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来源期刊

International Journal of Acoustics and Vibration ACOUSTICS-ENGINEERING, MECHANICAL

CiteScore

1.60

自引率

10.00%

发文量

审稿时长

12 months

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