Noise control zone for a periodic ducted Helmholtz resonator system

Cai, Chenzhi; Mak, Cheuk Ming

doi:10.1121/1.4968530

Cited by 32 publications

(16 citation statements)

References 11 publications

(18 reference statements)

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“…While passive interference is known to alter the acoustic performance, the challenge for this research is to investigate the possibility of designing an acoustic absorber that utilises interference for passive destruction and not in the commonly used active form. The benefit of this approach is the increased design flexibility that allows for free-form designs as compared to commonly used resonance approaches such as quarter-wave [50] or Helmholtz resonators [51]. As can be seen, the proposed system dismisses the requirement for acoustical signal monitoring or generation as featured in active systems.…”

Section: The Principle Behind the Proposed Design-based Interferencementioning

confidence: 99%

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: The Principle Behind the Proposed Design-based Interferencementioning

confidence: 99%

Acoustic absorption of passive destructive interference cavities

Arjunan

2019

Materials Today Communications

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“…However, the noise attenuation capacity of every single HR in the system remains unchanged [14]. The transmission loss of the whole system is fairly dependent on the number of HRs.…”

Section: Theoretical Analysis Of a Helmholtz Resonator Array Consimentioning

confidence: 99%

“…Wang and Mak [13] investigated the wave propagation in a duct mounted with an array of identical resonators and presented theoretical methods of noise attenuation bandwidth prediction. Cai and Mak [14] proposed a noise control zone comprising the attenuation bandwidth or peak amplitude of a periodically ducted HR system. Their results indicated that the broader the noise attenuation band, the lower the peak attenuation amplitude.…”

Section: Introductionmentioning

confidence: 99%

Noise Attenuation Performance of a Helmholtz Resonator Array Consist of Several Periodic Parts

Zhang

Mak

et al. 2017

Sensors

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The acoustic performance of the ducted Helmholtz resonator (HR) system is analyzed theoretically and numerically. The periodic HR array could provide a wider noise attenuation band due to the coupling of the Bragg reflection and the HR’s resonance. However, the transmission loss achieved by a periodic HR array is mainly dependent on the number of HRs, which restricted by the available space in the longitudinal direction of the duct. The full distance along the longitudinal direction of the duct for HR’s installation is sometimes unavailable in practical applications. Only several pieces of the duct may be available for the installation. It is therefore that this paper concentrates on the acoustic performance of a HR array consisting of several periodic parts. The transfer matrix method and the Bragg theory are used to investigate wave propagation in the duct. The theoretical prediction results show good agreement with the Finite Element Method (FEM) simulation results. The present study provides a practical way in noise control application of ventilation ductwork system by utilizing the advantage of periodicity with the limitation of available completed installation length for HRs.

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“…The other utilizes the coupling effects of the resonator and the structure to achieve broadband noise attenuation. The wave propagation in a periodic structure exhibits peculiar characteristics results from the Bragg reflections [15][16] . Owing to the coupling of the periodic structure and the resonator, the resonators distributed periodically on the duct provide a much broader noise attenuation compared to a single resonator 17) .…”

Section: Introductionmentioning

confidence: 99%

“…To obtain a broader noise attenuation band, combining several resonators in line is a possible way. Numerous studies have been conducted following this idea using two methods [12][13][14][15][16][17][18][19][20] . One uses a serial arrangement of resonators with different resonance frequencies to obtain a wide band of noise control in ducts.…”

Section: Introductionmentioning

confidence: 99%

The Improvement on Noise Attenuation Performance of a Duct-resonator System

Zhang

2017

Journal of Asian Architecture and Building Engineering

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The Helmholtz resonator (hereafter resonator) is qualified as a silencer with a narrow noise attenuation band at its designed resonance frequency. Combining several resonators in line is a possible way to produce a broader noise attenuation band. This paper focuses on improving the noise attenuation performance of a ductresonator system at low frequency. Two types of periodic duct-resonator system are analyzed theoretically and numerically: a duct-resonator system with identical resonators and a modified duct-resonator system with periodic two-resonator arrays. The planar wave theory and the transfer matrix method are used to investigate wave propagation in the duct-resonator system. The theoretical prediction results yield satisfactory agreement with the Finite Element Method simulation results. The results indicate that both the periodic duct-resonator system and the modified duct-resonator system can broaden the noise attenuation band. Furthermore, the proposed modified duct-resonator system in this paper contributes to a relatively broader noise attenuation band than the periodic duct-resonator system. The modified duct-resonator system provides a useful method for the design of such a system, in order to obtain a relatively broadband noise attenuation.

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Noise control zone for a periodic ducted Helmholtz resonator system

Cited by 32 publications

References 11 publications

Acoustic absorption of passive destructive interference cavities

Acoustic absorption of passive destructive interference cavities

Noise Attenuation Performance of a Helmholtz Resonator Array Consist of Several Periodic Parts

The Improvement on Noise Attenuation Performance of a Duct-resonator System

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