Results 21 to 30 of about 252,123 (184)
Optical Helmholtz resonators [PDF]
Applied Physics Letters, 2014 Helmholtz resonators are widely used acoustic components able to select a single frequency. Here, based on an analogy between acoustics and electromagnetism wave equations, we present an electromagnetic 2D Helmholtz resonator made of a metallic slit-box structure.
Paul Chevalier +3 more
openaire +1 more source
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
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
Experimental and numerical investigation of Helmholtz resonators and perforated liners as attenuation devices in industrial gas turbine combustors [PDF]
, 2014 This paper reports upon developments in the simulation of the passive control of combustion dynamics in industrial gas turbines using acoustic attenuation devices such as Helmholtz resonators and perforated liners.
Houston, B. +6 more
core +1 more source
Engineering Research Express, 2023 Ventilation duct systems are indispensable for air purification and room temperature management in industrial and commercial buildings. The noise generated by blowers for ventilating spaces should be as low as possible. In addition, to power the wireless
C. Tadokoro, Takuma Ito, T. Nagamine
semanticscholar +1 more source
Micromachines, 2020 A soundwave is transmitted by adjacent molecules in the medium, and depending on the type of sound, it exhibits various characteristics such as frequency, sound pressure, etc. If the acoustic wavelength of the soundwave is sufficiently long compared with
Sung Ho Lee +4 more
doaj +1 more source
Helmholtz Resonator Applied to Nanocrystal-Based Infrared Sensing.
Nano letters (Print), 2022 While the integration of nanocrystals as an active medium for optoelectronic devices progresses, light management strategies are becoming required. Over recent years, several photonic structures (plasmons, cavities, mirrors, etc.) have been coupled to ...
Claire Abadie +19 more
semanticscholar +1 more source
Asymptotics of the meta-atom: plane wave scattering by a single Helmholtz resonator [PDF]
Philosophical Transactions of the Royal Society A, 2022 Using a combination of multipole methods and the method of matched asymptotic expansions, we present a solution procedure for acoustic plane wave scattering by a single Helmholtz resonator in two dimensions.
M. J. Smith +4 more
semanticscholar +1 more source