Results 41 to 50 of about 1,334 (158)
FEM Investigation of a Multi-Neck Helmholtz Resonator
Applied Sciences, 2023 An increasingly significant area of research with several applications in numerous disciplines is that of multi-neck Helmholtz resonators. This research is set to explore the accuracy and applicability of the finite element method (FEM) for the ...
Nikolaos M. Papadakis +1 more
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Reduction of ear-position sound pressure at low speed in electric vehicles by pulp mold (Translated)
Mechanical Engineering JournalElectric vehicles (EVs) produce different cabin noise than internal combustion engine (ICE) vehicles during low-speed driving. To identify the cause of the interior noise of an EV at low speed (30km/h) and to reduce it, a Helmholtz resonator made of pulp
Sachito NAKANO +3 more
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Influence of the neck shape for Helmholtz resonators [PDF]
The Journal of the Acoustical Society of America, 2017 The resonance of a Helmholtz resonator is studied with a focus on the influence of the neck shape. This is done using a homogenization approach developed for an array of resonators, and the resonance of an array is discussed when compared to that of a single resonator.
Mercier, Jean-François +2 more
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Helmholtz resonators with large aperture
, 1998 The lowest resonant frequency of a cavity resonator is usually approximated by the classical Helmholtz formula. However, if the opening is rather large and the front wall is narrow this formula is no longer valid. Here we present a correction which is of third order in the ratio of the diameters of aperture and cavity.
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Resonance and Neck Length for a Spherical Resonator
International Scholastic Journal of Science, 2011 The relationship between the neck length of a spherical resonator and its period of fundamental resonance was investigated. This was done by measuring the frequency of fundamental resonance of the resonator at 6 different neck lengths.
Emily Corning
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A low frequency acoustic insulator by using the acoustic metasurface to a Helmholtz resonator
AIP Advances, 2017 Acoustic metasurfaces (AMSs) are able to manipulate wavefronts at an anomalous angle through a subwavelength layer. Their application provide a new way to control sound waves in addition to traditional materials.
Xiang Zhao +4 more
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Metasurfaces with Embedded Rough Necks for Underwater Low-Frequency Sound Absorption
Applied SciencesMarine noise pollution is a significant threat to global marine ecosystems and human activities. Most underwater sound-absorbing materials operate in the mid-to high-frequency bands (typically 1–10 kHz for mid-frequency and above 10 kHz for high ...
Dan Xu +4 more
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Broadband Sound-Absorbing Tile Comprising Nonwoven Sheet with Back Air Space and Helmholtz Resonator
TextilesA broadband sound-absorbing structure that combines a nonwoven sheet with a back air space and a Helmholtz resonator is proposed. The incident surface of the nonwoven sheet with the back air space is divided into two areas, and a sound-absorbing tile ...
Shuichi Sakamoto +5 more
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Numerical study of acoustic characteristics of sound-absorbing structures of various configurations
Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроениеThe acoustic characteristics of Helmholtz resonators with various configurations in the frequency range of 500…3000 Hz were simulated. The influence of the resonator shape, perforation diameter, volume and position of the resonator neck on the natural ...
P. V. Pisarev +2 more
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Surface Air Movement: An Important Contributor to Ventilation of Isolated Subsurface Structures?
Infrastructures, 2019 This study reports on near-surface airspeed measured using a fast-responding thermoanemometer during an investigation of ventilation of an isolated subsurface structure induced by natural forces. Air speed changes continuously, rapidly, and unpredictably
Thomas Neil McManus, Assed Haddad
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