Panel of resonators with variable resonance frequency for noise control

Cherrier, Olivier; Pommier-Budinger, Valérie; Simon, Frank

doi:10.1016/j.apacoust.2012.02.011

Cited by 12 publications

(15 citation statements)

References 14 publications

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“…Sound absorption is influenced by many factors, including: excitation frequency; material thickness; porosity; density; and design [15,16]. Frequency dependencies of the sound absorption coefficient of materials can be determined by the transfer function method ISO 10534-2 [17][18][19]. The complex acoustic transfer function H 12 is expressed by the formula: where r r and r i are the real and imaginary parts of the normal incidence reflection factor, H I is the transfer function for the incident wave, and H R is the transfer function for the reflection wave.…”

Section: Sound Absorption Measurementsmentioning

confidence: 99%

Investigation of advanced mica powder nanocomposite filler materials: Surface energy analysis, powder rheology and sound absorption performance

Lapčík

Vašina

Lapčı́ková

et al. 2015

Composites Part B: Engineering

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Two types of nano/micro sized mica powders for polymer composites, muscovite and phlogopite, were tested for their sound absorption capabilities. Acoustical performance was correlated to surface energy analysis and powder rheology testing. Inverse gas chromatography (iGC) was used to determine the surface energy, with the dominant M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT component being the dispersive component. This reflected the non-polar, hydrophobic, character of the micas. The determined yield locus and Mohr´s circles indicated that the material with the highest packing density exhibited more free flowing powder characteristics, compared with the lower packing density materials, which exhibited a greater cohesive powder flow behaviour. All tested mica powders were sensitive to aeration and become fluidised. Based on the acoustical measurements the worst sound absorption performance was found for the highest packing density material exhibiting the highest magnitude of the longitudinal elastic coefficient.

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Section: Sound Absorption Measurementsmentioning

confidence: 99%

Investigation of advanced mica powder nanocomposite filler materials: Surface energy analysis, powder rheology and sound absorption performance

Lapčík

Vašina

Lapčı́ková

et al. 2015

Composites Part B: Engineering

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“…When the mobile plate is in movement, previous works [6] have shown that the frequency resonance decreases and shifts towards the low frequencies.…”

mentioning

confidence: 99%

“…This article proposes the study of a baffle silencer with resonators tunable by the change of the neck shape. The resonators are made of two superposed and identically perforated plates associated with cavities [5,6]. One plate is fixed and bonded to the cavities and the other plate is mobile.…”

Section: Introductionmentioning

confidence: 99%

Silencer With Tunable Resonators for Active Noise Control

Cherrier

Pommier-Budinger

2012

Volume 2: Applied Fluid Mechanics; Electromechanical Systems and Mechatronics; Advanced Energy Systems; Thermal Engineering; Hu

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The article deals with active noise control and presents a silencer made of tunable acoustic resonators to reduce variable tonal noises. The silencer is composed of baffles with acoustic resonators made of two superposed and identically perforated plates associated with cavities. One of the plates is mobile and its displacement is controlled by an electromechanical system, allowing changing the internal shapes of the holes of the perforated layers. Consequently the impedance of the resonators and their resonance frequencies can be controlled. These tunable resonators can be used for noise control of variable tonal noises such as those generated by fans for example. The advantages of the proposed system are the simplicity of the actuation and the compactness of the system.

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“…Kostek and Franchek 11 proposed a hybrid resonator with an actively controlled cavity of the Helmholtz resonator. 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.…”

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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Panel of resonators with variable resonance frequency for noise control

Cited by 12 publications

References 14 publications

Investigation of advanced mica powder nanocomposite filler materials: Surface energy analysis, powder rheology and sound absorption performance

Investigation of advanced mica powder nanocomposite filler materials: Surface energy analysis, powder rheology and sound absorption performance

Silencer With Tunable Resonators for Active Noise Control

Adaptive muffler based on controlled flow valves

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