Results 101 to 110 of about 252,123 (184)

Photoacoustics Modelling using Amplitude Mode Expansion Method in a Multiscale T-cell Resonator

open access: yes, 2018
The photoacoustic (PA) effect consisting of the generation of an acoustic signal based on the absorption of light has already demonstrated its potential for various spectroscopic applications for both gaseous and solid samples. The signal produced during
Baumann, Bernd   +3 more
core  

Noise Elimination of a Multi-tone Broadband Noise with Hybrid Helmholtz Mufflers Using a Simulated Annealing Method

open access: yesArchives of Acoustics, 2013
Noise control is essential in an enclosed machine room where the noise level has to comply with the occupational safety and health act. In order to overcome a pure tone noise with a high peak value that is harmful to human hearing, a traditional ...
Min-Chie CHIU
doaj  

Numerical investigation on acoustic damping characteristics of dual Helmholtz resonators in presence of a grazing flow

open access: yesJournal of Low Frequency Noise, Vibration and Active Control
In this study, the acoustic damping performances of the dual Helmholtz resonators were numerically evaluated using a 3D model. The grazing flow passes tangentially through the resonator neck, with a Mach number range of 0 ≤ Ma ≤ 0.1.
He Zhao, Dan Zhao, Xu Dong
doaj   +1 more source

Helmholtz Resonance in a Water Bottle

open access: yesInternational Scholastic Journal of Science, 2011
The resonance that occurs when blowing across the top of a water bottle filled with different volumes of water was studied. It was shown that, contrary to popular belief, a water bottle is not an ideal Helmholtz resonator. Resonance in a water bottle
Annirudh Balachandran,   +2 more
doaj  

Two approaches to the solution of resonance and guiding girotropic filling structures boundary value problems

open access: yesФизика волновых процессов и радиотехнические системы, 2015
The T and L methods of boundary value problems solving to concern electrodynamic girotropic filling structures have been developed in the cylindrical coordinate system.
E.A. Mihalitsyn   +2 more
doaj  

The response of Helmholtz resonator to external excitation. Part I: Acoustically induced resonance

open access: yesArchives of Acoustics, 2004
The first of two companion papers theoretical and experimental results are presented for a Helmholtz resonator subject to external excitation by an acoustic plane wave.
M. Meissner
doaj  

Ultra-broadband sound-absorbing metastructure with Helmholtz resonator and porous material modulation crown

open access: yesMaterials & Design
Dazuo Wang   +4 more
semanticscholar   +1 more source

Sunroof Boom [PDF]

open access: yes, 1999
Allwright, D.J., Stokes, N.
core  

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