Results 91 to 100 of about 252,123 (184)
The Improvement on Noise Attenuation Performance of a Duct-resonator System
Journal of Asian Architecture and Building Engineering, 2017 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.
Dizi Wu, Nan Zhang
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A model for the pressure excitation spectrum and acoustic impedance of sound absorbers in the presence of grazing flow [PDF]
The acoustic impedance of sound absorbers in the presence of grazing flow is essential information when analyzing sound propagation within ducts. A unification of the theory of the nonlinear acoustic resistance of Helmholtz resonators including grazing ...
Rice, E. J.
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Development and testing of cabin sidewall acoustic resonators for the reduction of cabin tone levels in propfan-powered aircraft [PDF]
The use of Helmholtz resonators to increase the sidewall transmission loss (TL) in aircraft cabin sidewalls is evaluated. Development, construction, and test of an aircraft cabin acoustic enclosure, built in support of the Propfan Test Assessment (PTA ...
Balena, F. J. +3 more
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The coupling of a hearing aid loudspeaker membrane to visco-thermal air layers [PDF]
, 2007 Hearing aids and their components are becoming smaller. This presents new problems for the acoustical components, such as the loudspeaker. A circular membrane of a hearing aid loudspeaker is modeled in this paper.
A. De Boer +4 more
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Journal of Physics: Theories and Applications, 2019 Acoustic energy harvesting is one of many ways to harness acoustic noises as wasted energy into useful electical energy using an acoustic energy harvester.
Hedwigis Harindra +2 more
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Behaviour of acoustic waves in a duct with Helmholtz resonator in presence of a temperature gradient [PDF]
, 2014 Understanding the behaviour of one-dimensional acoustical wave propagation in ducts is very important for controlling combustion instabilities in propulsion, household burners, gas turbine combustors, and designing engineering mufflers.
Haydar , Aygun
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Neck shape optimization of resonator-type sound absorbers using adjoint lattice Boltzmann method
AIP AdvancesResonant sound-absorbing devices, such as Helmholtz resonators, can effectively reduce discrete frequency noise radiated from various engineering equipment.
Kimiya Takeuchi, Kazuya Kusano
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Noise filter using a periodic system of dual Helmholtz resonators
Scientific ReportsThis study investigates noise reduction using a periodic arrangement of dual Helmholtz resonators and explores the introduction of defects within this periodic structure. The transfer matrix method was employed to carry out theoretical research.
Mohamed El Malki +3 more
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MachinesTo address the flow field noise problem in twin-screw air compressors, multi-physical-field coupling technology is employed to perform flow field noise calculations for the compressor.
Yayin He +5 more
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Fluid mechanical model of the Helmholtz resonator [PDF]
A semi-empirical fluid mechanical model of the acoustic behavior of Helmholtz resonators is presented which predicts impedance as a function of the amplitude and frequency of the incident sound pressure field and resonator geometry.
Hersh, A. S., Walker, B.
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