Acoustic attenuation characteristics of the muffler phononic crystal with hybrid resonators

Liu, Panxue; Zuo, Shuguang; Wu, Xudong; Kong, Yi

doi:10.1016/j.ijmecsci.2022.107677

Cited by 10 publications

(2 citation statements)

References 52 publications

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“…In addition, a gas-liquid duct silencer can enrich the acoustic performance of low-frequency noise attenuation [17], the results show that ultra-broad bands and ultra-low frequencies can be reduced by silencers with a small size. A broadband and strong sound attenuation can be achieved by periodic the perforated and micro-perforated periodic expansion chambers muffler [18][19][20][21][22] which offer a promising application in duct noise control. Other efficient designs used Helmholtz resonators [23][24][25][26][27], and extended-tube resonators [28][29][30] to reduce noise at low frequencies.…”

Section: Introductionmentioning

confidence: 99%

Defect mode properties of an acoustic structure made up of periodic expansion chambers containing defects

El Malki,

Antraoui,

Khettabi

2024

E3S Web Conf.

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Noise pollution is an environmental menace in agricultural, industrial, commercial, and residential facilities of all countries around the globe particularly developing countries. This paper examines noise reduction of an acoustic band gap structure made from expansion chambers. The interface response predictions of the transmission loss are presented and compared with the experiment, and the boundary element method (BEM) data obtained from the literature showing good agreement at low frequencies. A wider band gap with and stronger muffling effects at a lower frequencies is shown, which depends on the geometry of the expansion chamber and the periodicity. Furthermore, the periodicity is broken by the introduction of defects to analyse the narrow frequency transmission bands within the band gaps. In this work, the defect is artificially produced and controlled by the length and/or the cross-section of the central waveguide segment. The influence of dimension parameters on the wave suppression band gaps is analyzed. We show that the defect mode transmission moves within band gaps. It location can be controlled by the dimension of the defective expansion chamber. The closest to the middle of the band gap, the narrowest becomes. The results presented in this work can help to guide the achievement of broader acoustic band gaps in waveguide systems.

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Section: Introductionmentioning

confidence: 99%

Defect mode properties of an acoustic structure made up of periodic expansion chambers containing defects

El Malki,

Antraoui,

Khettabi

2024

E3S Web Conf.

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show abstract

“…According to Lee and Wang (2006), sound-absorbing materials are highly effective at controlling noise because they absorb the majority of the sound energy that strikes them. They are employed in various settings, including pathways, near sources of noise, and occasionally near receivers (Mishra et al, 2021;Liu et al, 2022). Although all materials absorb some incident sound, the term "acoustical material" has historically been used to refer to materials that have been created with the express intention of offering high absorption values.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Noise Level with Convergent and Divergent Shape of Muffler and its Impact on Noise Pollution

Jatola,

Gupta

2023

IJERR

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Noise pollution is one of the key hazards that decreases people's quality of life globally. Due to the rapid development of technology, industrialization, urbanization, and transportation networks, noise pollution has reached serious levels in recent years. Sound transmission loss, the attenuation of sound as it passes through diverse objects and environments, is crucial in lowering noise pollution and preserving the acoustic integrity of ecosystems. Due to de-throttling tactics implemented to optimize cylinder fill, the intake system of internal combustion engines is the primary noise source while the vehicle is at low speeds and high loads. Therefore, achieving high acoustic performance of intake systems constitutes a critical issue in complying with the increasingly stringent European regulations for overall noise emission. The Transmission Loss computation is typically the most used technique for describing a system's acoustic performances. This work provided an overview of sound transmission loss and discussed its substantial environmental effects. It investigates the fundamentals of sound transmission, the factors that influence it, and the environmental impacts of sound attenuation. This paper proposed a comparison of three designs like straight duct (muffler), convergent and divergent design of muffler. The main aim is to observe sound transmission loss and compare the noise level with three muffler configurations with the same gas volume. High transmission loss indicates more noise reduction in muffler design, which will help reduce environmental noise pollution.

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Advances in Muffler Acoustics: From Conventional Material to Acoustic Metamaterial

Gaonkar,

Sreenivasa

2024

Sustainable Civil Infrastructures

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Acoustic attenuation characteristics of the muffler phononic crystal with hybrid resonators

Cited by 10 publications

References 52 publications

Defect mode properties of an acoustic structure made up of periodic expansion chambers containing defects

Defect mode properties of an acoustic structure made up of periodic expansion chambers containing defects

Analysis of Noise Level with Convergent and Divergent Shape of Muffler and its Impact on Noise Pollution

Advances in Muffler Acoustics: From Conventional Material to Acoustic Metamaterial

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