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2020•IOP Conference Series Earth and Environmental ScienceOpen access

Sound attenuation performance of periodic expansion chamber mufflers

Xiaofeng Shi

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Abstract

Abstract Expansion chamber mufflers are often used for duct noise control of building ventilation systems. In this paper, the periodic arrangement of expansion chamber muffler is proposed to improve the sound attenuation performance. The sound attenuation of periodic expansion chamber mufflers is investigated theoretically with Bloch wave theory and a case is calculated for the distance between mufflers and the length of the expansion chamber are the same. The results reveal that the transmission loss of the expansion muffler is enhanced by the periodic arrangement.

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What this paper is about

Abstract Expansion chamber mufflers are often used for duct noise control of building ventilation systems. In this paper, the periodic arrangement of expansion chamber muffler is proposed to improve the sound attenuation performance. The sound attenuation of periodic expansion chamber mufflers is investigated theoretically with Bloch wave theory and a case is calculated for the distance between mufflers and the length of the expansion chamber are the same. The results reveal that the transmission loss of the expansion muffler is enhanced by the periodic arrangement.

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Available abstract

Abstract Expansion chamber mufflers are often used for duct noise control of building ventilation systems. In this paper, the periodic arrangement of expansion chamber muffler is proposed to improve the sound attenuation performance. The sound attenuation of periodic expansion chamber mufflers is investigated theoretically with Bloch wave theory and a case is calculated for the distance between mufflers and the length of the expansion chamber are the same. The results reveal that the transmission loss of the expansion muffler is enhanced by the periodic arrangement.

Key concepts: Expansion chamber, Muffler, Acoustics, Attenuation, Acoustic attenuation, Transmission loss, Noise control, Sound transmission class

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