Abstract
Reactive and dissipative mufflers are effective means to attenuate low-frequency noise emitted
from vehicle exhaust systems. Conventional muffler design by global optimization has
difficulty in choosing appropriate optimization parameters. In this study, a sub-chamber
muffler design approach by cascading multiple sub-chambers with different transmission loss
(TL) characteristics to achieve an overall broadband noise attenuation is proposed. To
demonstrate its effectiveness, the acoustic performance of mufflers fitted on the mining haul
trucks and their better design is investigated. The existing muffler shows strong sound
attenuation at frequencies from 200 to 300 Hz but fails to work well at other frequencies. To
improve its broadband performance, the muffler’s inner structure is revised by tuning the subchamber
geometric parameters to provide additional TL bands. Through simulated results,
the revised muffler is demonstrated to provide a broader acoustic stop band in the design
frequency range compared with the existing one.
from vehicle exhaust systems. Conventional muffler design by global optimization has
difficulty in choosing appropriate optimization parameters. In this study, a sub-chamber
muffler design approach by cascading multiple sub-chambers with different transmission loss
(TL) characteristics to achieve an overall broadband noise attenuation is proposed. To
demonstrate its effectiveness, the acoustic performance of mufflers fitted on the mining haul
trucks and their better design is investigated. The existing muffler shows strong sound
attenuation at frequencies from 200 to 300 Hz but fails to work well at other frequencies. To
improve its broadband performance, the muffler’s inner structure is revised by tuning the subchamber
geometric parameters to provide additional TL bands. Through simulated results,
the revised muffler is demonstrated to provide a broader acoustic stop band in the design
frequency range compared with the existing one.
Original language | English |
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Number of pages | 10 |
Publication status | Published - 2016 |
Event | NOVEM 2015: Noise and Vibrations - Emerging Technologies - Dubrovnik, Croatia Duration: 13 Apr 2015 → 15 Apr 2015 |
Conference
Conference | NOVEM 2015 |
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Country/Territory | Croatia |
City | Dubrovnik |
Period | 13/04/15 → 15/04/15 |