Results 11 to 20 of about 1,334 (158)
Frontiers in Materials, 2022 Acoustic energy, especially broadband low-frequency sound energy is part of the environmental mechanical energy acquisition cannot be ignored. Herein, a multi-tube parallel Helmholtz resonator-based triboelectric nanogenerator (MH-TENG) is investigated ...
Qiqi Zhang +6 more
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Evaluation of the Oscillation Velocity in the Neck of the Helmholtz Resonator in Nonlinear Regimes
Acoustics, 2022 Methods for measuring the acoustic characteristics of orifices have been reviewed. Comparison of three methods for evaluating of oscillation velocity in the neck of the Helmholtz resonator are presented.
Alexandr Komkin +2 more
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Superfluid Helmholtz Resonators [PDF]
The Journal of the Acoustical Society of America, 1966 The equations governing the resonances of a superfluid in a Helmholtz resonator have been developed. Four cases are considered: (1) when the entire resonator is packed with a superleak; (2) when only the neck is packed with superleak; (3) when only the volume is packed with the superleak; (4) when no superleak is present.
Michael A. Kriss +2 more
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Reduction of ear-position sound pressure at low speed in electric vehicles by pulp mold
Nihon Kikai Gakkai ronbunshu, 2022 Electric vehicles (EVs) generate different cabin noise from internal combustion engine vehicles (ICE) during low-speed driving. In order to identify the cause of the interior noise of EVs at low-speed (30km/h) and to reduce the noise, a Helmholtz ...
Sachito NAKANO +3 more
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Giraffe Helmholtz resonance [PDF]
The Journal of the Acoustical Society of America, 2013 Many animal species, including elephants and okapi, use sounds above and below the range of human hearing to communicate. A longitudinal study presented here suggests giraffe produce infrasonic vocalizations using Helmholtz resonance. Recordings were made of giraffe (Giraffe camelopardalis) in controlled indoor conditions and naturalistic outdoor ...
Elizabeth vonMuggenthaler +1 more
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Noise reduction efficiency of Helmholtz resonator in simulated channel of HVAC system
International Journal of Environmental Health Engineering, 2014 Aims: The purpose of this article was investigating the efficiency of designing resonator in decreasing low noises. Materials and Methods: The designed Helmholtz resonator was installed in a channel analogous to ventilation channel.
Hossein Ali Yousefi Rizi +2 more
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A Novel Circular Plate Acoustic Energy Harvester for Urban Railway Noise
Shock and Vibration, 2021 To harvest acoustic energy from urban railways, a novel and practical acoustic energy harvester is developed. The harvester consists of a piezoelectric circular plate and a Helmholtz resonator.
Tian-Chen Yuan +4 more
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Nihon Kikai Gakkai ronbunshu, 2016 To reduce noise, Helmholtz resonators are widely used in internal-combustion engine intake systems, in the rocket engine's combustion chambers and building wall materials.
Shinichi MARUYAMA +2 more
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Improvement of Sound Insulation Through Double-Panel Structure by Using Hybrid Local Resonator Array [PDF]
Archives of Acoustics, 2023 In this paper, we present one approach to improve the soundproofing performance of the double-panel structure (DPS) in the entire audible frequencies, in which two kinds of local resonances, the breathing-type resonance and the Helmholtz resonance, are ...
Kyong-Su Ri +2 more
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Experimental realization of extraordinary acoustic transmission using Helmholtz resonators
AIP Advances, 2015 The phenomenon of extraordinary acoustic transmission through a solid barrier with an embedded Helmholtz resonator (HR) is demonstrated. The Helmholtz resonator consists of an embedded cavity and two necks that protrude, one on each side of the barrier ...
Brian C. Crow +4 more
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