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The theory of the Helmholtz resonator [PDF]
Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, 1916 Abstract The ideal form of Helmholtz resonator is a cavernous space, almost enclosed by a thin, immovable wall, in which there is a small perforation establishing a communication between the interior and exterior gas. An approximate theory, based upon the supposition that the perforations is small, and consequently that the wave ...
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RESEARCH OF THE RESONANCE PROPERTIES OF HELMHOLTZ RESONATORS
ScienceRise, 2020 The object of research. Process of oscillation of the Helmholtz resonators. Investigated problem. Differences between some formulas for the calculation of the resonant frequency of the Helmholtz resonator and the most accurate of them were established.
Yuliia Kopytko +4 more
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Enhancement of Low-Frequency Noise for Muffler by Optimizing the Space between Three 1-Degrees of Freedom Helmholtz Resonator [PDF]
MATEC Web of ConferencesThe Helmholtz resonator is one of the basic elements to attenuate low-frequency noise and increase sound transmission loss in a muffler for particular low frequency zone.
Jatola Ravi, Gupta Amit Kumar
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Applied Sciences, 2023 A 600-km/h maglev train can effectively close the speed gap between civil aviation and rail-based trains, thereby alleviating the conflict between the existing demand and actual capacity.
Dian-Qian Li +4 more
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Helmholtz Resonance in Korean Bells
International Scholastic Journal of Science, 2017 Traditional Korean bells are installed above a shallow well with a gap between the bell and the ground, effectively creating a Helmholtz resonator. During installation, the size of the well and the gap is traditionally adjusted, through trial and error ...
Junghyun Kim
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Low frequency acoustic energy harvester based on a planar Helmholtz resonator
AIP Advances, 2018 A novel acoustic energy harvester (AEH) based on an acoustic Helmholtz resonator is proposed in this research to harvest low frequency acoustic energy.
Ming Yuan +3 more
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International Journal of Environmental Health Engineering, 2015 Aims: The main goal of this paper was to evaluate the effectiveness of Helmholtz resonator in noise reduction of duct equipped with active noise control (ANC). Materials and Methods: Noise frequency band was produced by a propeller fan, which was spread
Farhad Forouharmajd +3 more
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AIP AdvancesAn acoustic frequency-selective Y-shaped waveguide splitter based on in-line Helmholtz resonators is demonstrated analytically via a modified transfer matrix method, computationally through finite element simulations using COMSOL, and experimentally by ...
William M. Robertson +2 more
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Extraordinary acoustic transmission mediated by Helmholtz resonators
AIP Advances, 2014 We demonstrate perfect transmission of sound through a rigid barrier embedded with Helmholtz resonators. The resonators are confined within a waveguide and they are oriented such that one neck protrudes onto each side of the barrier.
Vijay Koju +2 more
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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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