Results 11 to 20 of about 252,123 (184)
Design of Helmholtz Resonator with Required Characteristics [PDF]
MATEC Web of Conferences, 2020 The method of calculation design of the Helmholtz resonator in the duct is considered based on the transition to dimensionless parameters, which are determined concerning the transverse size of the duct. The acoustical impedance of Helmholtz resonator is
Bykov Aleksei, Komkin Alexandr
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Advanced Film-Type Acoustic Reflector Inspired by Helmholtz Resonator [PDF]
한국정밀공학회지, 2020 Sound waves propagate in a manner in which energy is transmitted by adjacent molecules in the medium. These adjacent molecules exhibit inherent sound wave characteristics, such as height and wavelength, depending on the sound frequency.
Sung Ho Lee +4 more
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Materials, 2023 A Helmholtz resonator (HR) with an embedded aperture is an effective acoustic metamaterial for noise reduction in the low-frequency range. Its sound absorption property is significantly affected by the aperture shape.
Shaohua Bi +8 more
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Helmholtz Resonator with Sonic Black Hole Neck
International Journal of Acoustics and Vibration, 2023 The acoustic performance of a Helmholtz resonator (HR) with a sonic black hole (SBH) neck is investigated in this study both theoretically and experimentally.
Lihua Peng, Qibo Mao
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On the interaction of Tollmien–Schlichting waves with a wall-embedded Helmholtz resonator
The Physics of Fluids, 2023 The influence of a wall-embedded Helmholtz resonator on the development and stability of Tollmien–Schlichting (TS) waves is investigated numerically and experimentally for a range of frequencies extending from below to above resonance.
T. Michelis, C. de Koning, M. Kotsonis
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Journal of Low Frequency Noise Vibration and Active Control, 2023 Acoustic metamaterials with both ventilation and broadband asymmetric absorption have demonstrated great scientific significance and promising applicability.
Deshi Meng, Lijun Li, Zhenhua Wu
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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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Elastic Helmholtz resonators [PDF]
The Journal of the Acoustical Society of America, 1992 The influence of wall elasticity on the response of a Helmholtz resonator is examined by analyzing the canonical case of a thin elastic spherical shell with a circular aperture subject to plane-wave excitation. By neglecting the thickness of the wall and representing the elasticity via a thin shell theory the problem is reduced to one of solving an ...
A. N. Norris, G. Wickham
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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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Tailoring Plate Thickness of a Helmholtz Resonator for Improved Sound Attenuation [PDF]
, 2016 A Helmholtz resonator with flexible plate attenuates noise in exhaust ducts, and the transmission loss function quantifies the amount of filtered noise at a desired frequency.
Duncan, Scott, Nudehi, Shahin
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