Results 71 to 80 of about 252,123 (184)
Journal of Low Frequency Noise, Vibration and Active Control, 2019 As a typical noise-attenuating device, Helmholtz resonators are widely implemented in aero-engines and gas turbines to decrease the transmission of acoustic noise.
Zhengli Lu, Weichen Pan, Yiheng Guan
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Experimental Test of a Two-dimensional Approximation for Dielectric Microcavities
, 2009 Open dielectric resonators of different shapes are widely used for the manufacture of microlasers. A precise determination of their resonance frequencies and widths is crucial for their design. Most microlasers have a flat cylindrical geometry, and a two-
A. Richter +12 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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, 2021 We have theoretically and experimentally demonstrated subwavelength acoustic energy harvesting via topological interface states in 1D Helmholtz resonator arrays. The system can produce two types of bandgaps in the subwavelength realm due to the resonance
Degang Zhao +3 more
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Resonance widths for general Helmholtz resonators with straight neck [PDF]
Duke Mathematical Journal, 2016 We prove an optimal exponential lower bound on the width of the resonance associated to the first eigenvalue of the cavity for a general Helmholtz resonator with straight neck, in any dimension.
Duyckaerts, Thomas +2 more
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Scientific ReportsThis study investigates a compact acoustic metasurface of periodic parallel Helmholtz resonators with a resonator defect located in the middle of the structure for gas-sensing applications.
Zaky A. Zaky +5 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 However, if the opening is rather large and the front wall is narrow this formula is no longer valid.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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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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Cavity QED with magnetically coupled collective spin states
, 2011 We report strong coupling between an ensemble of nitrogen-vacancy center electron spins in diamond and a superconducting microwave coplanar waveguide resonator.
Amsüss, Robert +11 more
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Model studies of Helmholtz resonances in rooms with windows and doorways [PDF]
Numerical analysis of Helmholtz resonator system established between windows and open doors when subjected to sonic boom impulsive ...
Koopmann, G., Pollard, H.
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