Results 111 to 120 of about 1,334 (158)
Some of the next articles are maybe not open access.
Applied Acoustics, 2010
Abstract Acoustic characteristics of a dual Helmholtz resonator which consists of a pair of cylindrical neck and cavity connected in series (neck–cavity–neck–cavity) are established primarily in terms of a lumped-parameter theory. The results are then compared to (a) a two-dimensional analytical approach by applying a pressure/velocity matching ...
M.B. Xu, A. Selamet, H. Kim
openaire +1 more source
Abstract Acoustic characteristics of a dual Helmholtz resonator which consists of a pair of cylindrical neck and cavity connected in series (neck–cavity–neck–cavity) are established primarily in terms of a lumped-parameter theory. The results are then compared to (a) a two-dimensional analytical approach by applying a pressure/velocity matching ...
M.B. Xu, A. Selamet, H. Kim
openaire +1 more source
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.
openaire +2 more sources
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
The Journal of the Acoustical Society of America, 1952
The explanation of the acoustical action of multiple Helmholtz resonators, except for one and two cavities, has not been developed. Application of Lagrange's method is made to obtain the equations of motion of the fluid displacements. The equation for the frequencies of resonance is obtained by placing the determinant of the coefficients of the ...
C. S. McGinnis, V. F. Albert
openaire +1 more source
The explanation of the acoustical action of multiple Helmholtz resonators, except for one and two cavities, has not been developed. Application of Lagrange's method is made to obtain the equations of motion of the fluid displacements. The equation for the frequencies of resonance is obtained by placing the determinant of the coefficients of the ...
C. S. McGinnis, V. F. Albert
openaire +1 more source
The Journal of the Acoustical Society of America, 1989
For electronically reproducing the total sound produced by a musical instrument, the musical instrument comprises a plurality of components each of which produces one aspect of the total sound, an electronic acoustic reproduction system comprises vibration transducer means mounted on the instrument for receiving the one aspect of the total sound from ...
Joseph F. Hayes, Warwick H. Holmes
openaire +1 more source
For electronically reproducing the total sound produced by a musical instrument, the musical instrument comprises a plurality of components each of which produces one aspect of the total sound, an electronic acoustic reproduction system comprises vibration transducer means mounted on the instrument for receiving the one aspect of the total sound from ...
Joseph F. Hayes, Warwick H. Holmes
openaire +1 more source
SPLITTING OF THE POLES OF A HELMHOLTZ RESONATOR
Russian Academy of Sciences. Izvestiya Mathematics, 1994Summary: It is shown that in a neighborhood of a two-fold eigenvalue of the Neumann problem there are two poles of the Green's function of the Helmholtz resonator. Asymptotic expressions for them with respect to a small parameter \(\varepsilon\) (the linear size of the hole) are constructed, and the principal terms of the asymptotics are written out ...
openaire +1 more source
Helmholtz resonance of harbours
Journal of Fluid Mechanics, 1975The resonant response of a harbour H of depth scale d and area A to excitation of frequency ω through a mouth M of width a is calculated in the joint limit a2/Aω2A/gd↓0. The results are relevant to the tsunami response of narrow-mouthed harbours. 16 is assumed that an adequate approximation to the radiation impedance of the external domain is available
Miles, John W., Lee, Y. K.
openaire +2 more sources
The Helmholtz resonator revisited
European Journal of Physics, 2018Abstract Helmholtz resonances are cavity resonances. They have played an important role in the development of acoustics and are now used in technical applications. They also contribute to the sound quality of some musical instruments.
Hans G Dosch, Matthias Hauck
openaire +1 more source
Helmholtz resonator loudspeaker
The Journal of the Acoustical Society of America, 1998A Helmholtz resonator loudspeaker having a capsule shape that may be truncated at one or both ends. When the housing is truncated, dampening material may be added at the truncated portion. Legs or a stand aid in the physical stability and to further assist the acoustics.
openaire +1 more source
Resonant frequencies of cylindrical Helmholtz resonators
The Journal of the Acoustical Society of America, 1975A simple analysis predicts the Helmholtz and higher modes of cylindrical resonators. Formulas for the quarter-wave tube, the closed tube, and the classic Helmholtz resonator are special cases. It is found that the classic Helmholtz formula begins to lose accuracy for resonator lengths L≳λ/16.
Ronald L. Panton, John M. Miller
openaire +1 more source