Noise reduction using a quarter wave tube with different orifice geometries

Howard, Carl Q.; Craig, Richard A.

doi:10.1016/j.apacoust.2013.08.006

Cited by 22 publications

(12 citation statements)

References 13 publications

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“…(4) and (5). Where, and are the signals transformed from and , and denote the 'real' and 'imaginary' components of the reflected sound, is the distance between the two microphones and is the linear distance from the specimen surface to the furthest microphone.…”

Section: Experimental Measurementmentioning

confidence: 99%

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Acoustic absorption of passive destructive interference cavities

Arjunan

2019

Materials Today Communications

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Acoustic products are primarily designed for broadband acoustic absorption.However, frequency-dependent acoustic absorption featuring passive designbased solutions are necessary to combat the growing noise pollution.Accordingly, this research investigates the targeted creation of sound absorption as a function of geometry utilising the principle of Acoustic Interference (AI). A methodology to design freeform geometries that can create targeted acoustic absorption is presented. The effectiveness of this methodology is then experimentally validated while quantifying the influence of length, diameter and geometry orientation. The results establish that AI has the potential to create 'near perfect' sound absorption that can be customised depending on the source frequency. The design freedom revealed by this study allows the exploitation of freeform geometries as passive highefficiency sound absorbing devices.

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Section: Experimental Measurementmentioning

confidence: 99%

“…Broadband acoustic absorbers are extensively used for noise control application. These acoustic absorbers can be broadly classified into porous and resonant [1][2][3] with the latter involving Helmholtz and quarter-wave resonators [4,5], perforated panels [6], and membrane absorbers [7].…”

Section: Introductionmentioning

confidence: 99%

Acoustic absorption of passive destructive interference cavities

Arjunan

2019

Materials Today Communications

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“…Recent analysis on quarter wavelength resonators were carried out by Cambonie et al [34] who studied the effect of curvature while the effect of orifice geometries were quantified by Howard and Craig [35].…”

Section: Introductionmentioning

confidence: 99%

Targeted sound attenuation capacity of 3D printed noise cancelling waveguides

Arjunan

2019

Applied Acoustics

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The study explores the creation of 3D printed sound cancelling waveguides that can be customised for selected frequencies as a function of geometry. The potential for attenuation in these waveguides is characterised through experimentally measured acoustic-absorption () and Transmission Loss (TL). This was done to evaluate the potential of geometry-controlled waveguides in the development of passive sound cancelling structures. Geometrically complex waveguides to exploit the Herschel-Quincke-Arjunan (HQA) waveguide model manufactured in Nylon-12 using Selective Laser Melting (SLM) are presented. The attenuation of the waveguides was compared to the bulk Nylon-12 materials to segregate the material-based influence. The results showed that the performance of HQA waveguides can be controlled as a function of length, diameter and waveguide-tortuosity. Accordingly, under right parameters significant improvement in (0.96, 0.80, 0.61 and 0.98) and TL (65.59%, 30.15%, 53.36% and 95.28%) can be achieved at the design frequency. The proposed methodology can be used to develop customisable waveguides exploiting the principles of acoustic wave interference for a range of application including building walls, noise barriers and absorptive panels.

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“…Cherrier et al 13 created perforated panel resonators with an active control of their openings, so called necks. Howard and Craig 10,14 presented an adaptive quarter-wave resonator to attenuate the exhaust noise of a V6 petrol engine, adapting to changes in engine operating conditions (speed and load), and exhaust gas temperature. In available literature on adaptive mufflers, the main acoustic path is manipulated in a way that increases transmission loss at different operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Adaptive muffler based on controlled flow valves

Šteblaj

Čudina

Lipar

et al. 2015

The Journal of the Acoustical Society of America

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An adaptive muffler with a flexible internal structure is considered. Flexibility is achieved using controlled flow valves. The proposed adaptive muffler is able to adapt to changes in engine operating conditions. It consists of a Helmholtz resonator, expansion chamber, and quarter wavelength resonator. Different combinations of the control valves' states at different operating conditions define the main working principle. To control the valve's position, an active noise control approach was used. With the proposed muffler, the transmission loss can be increased by more than 10 dB in the selected frequency range.

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Noise reduction using a quarter wave tube with different orifice geometries

Cited by 22 publications

References 13 publications

Acoustic absorption of passive destructive interference cavities

Acoustic absorption of passive destructive interference cavities

Targeted sound attenuation capacity of 3D printed noise cancelling waveguides

Adaptive muffler based on controlled flow valves

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