Results 201 to 210 of about 1,130 (256)
Sound Absorption Performance of Biobased Miura-Ori Origami Panel Absorbers Made from Impermeable Paper Membrane. [PDF]
Polymers (Basel)Čurović L +5 more
europepmc +1 more source
Multi-Resonant Metamaterial Absorber for Electromagnetic Absorption in S-, C-, X-, and Ku- Bands. [PDF]
Sensors (Basel)Din IU, Khan D, Ahmad S, Denidni TA.
europepmc +1 more source
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 +2 more
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METHOD FOR ADJUSTING A HELMHOLTZ RESONATOR AND AN ADJUSTABLE HELMHOLTZ RESONATOR
The Journal of the Acoustical Society of America, 2013In a method for adjusting a Helmholtz resonator ( 10 ), in which a resonator volume ( 11 ) is connected to a space ( 13 ) to be provided with damping along an axis ( 29 ) via a constriction ( 12 ) having an acoustic impedance, the acoustic impedance of the constriction ( 12 ) is altered in order to adjust the Helmholtz resonator ( 10 ).
Bruno Schuermans, Jaan Hellat
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Helmholtz resonator with extended neck
The Journal of the Acoustical Society of America, 2003Acoustic performance of a concentric circular Helmholtz resonator with an extended neck is investigated theoretically, numerically, and experimentally. The effect of length and shape of, and the perforations on the neck extension is examined on the resonance frequency and the transmission loss.
Ahmet, Selamet, Iljae, Lee
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Leakage effect in Helmholtz resonators
The Journal of the Acoustical Society of America, 2009The effect of leakage in Helmholtz resonators has been investigated in this predominantly experimental study combined with a computational effort. A prototype has been built with varying levels of intentional leakage due to holes in the baffle and gaps between the baffle and the housing.
Ahmet, Selamet +2 more
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On the adjustment of Helmholtz resonators
Applied Acoustics, 2014Abstract A Helmholtz resonator is placed in a room with distinct acoustic modes, and is tuned to one of the corresponding resonant frequencies. The optimal resonator damping ratio is investigated, as a goal-dependent value. For example, minimizing reverberation time requires a different damping ratio from minimizing the sound pressure level.
J. Klaus +3 more
exaly +2 more sources
Journal of Sound and Vibration, 1976
Abstract This paper develops the theory of the excitation of a Helmholtz resonator by external disturbances located arbitrarily close to the mouth of the resonator. The classical approach of Rayleigh is thereby extended to situations in which the disturbance at the mouth is not necessarily equivalent to a uniform, time dependent pressure perturbation.
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Abstract This paper develops the theory of the excitation of a Helmholtz resonator by external disturbances located arbitrarily close to the mouth of the resonator. The classical approach of Rayleigh is thereby extended to situations in which the disturbance at the mouth is not necessarily equivalent to a uniform, time dependent pressure perturbation.
openaire +2 more sources