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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
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Resonant Frequency of Slotted Ring Resonator
30th European Microwave Conference, 2000, 2000The slotted ring resonator has some promising features for the realisation of compact microwave filters. For the first time, using the finite difference technique and conformal mapping method, the effects of geometrical parameters (i.e.: the resonator length, inner radius, gap width and wall thickness) on the resonant frequency of this resonator, are ...
Dariush Mirshekar-Syahkal +2 more
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Acoustic resonance frequencies of deformed spherical resonators. II
The Journal of the Acoustical Society of America, 1982The effects of imperfect spherical shape on the modes of a spherical acoustic resonator are considered. The resonator boundary is described by a series of spherical harmonics r=a+εa∑ clkYlk, where ε is a small parameter. It is convenient to summarize the results by considering deformations which do not change the resonator volume.
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Frequency-resonance-enhanced vibrational resonance in bistable systems
Physical Review E, 2011The dynamics in an overdamped bistable system subject to the action of two periodic forces (assuming their frequencies are ω and Ω, and amplitudes are A and B, respectively) is studied. For the usual vibrational resonance, the nonmonotonic dependence of signal output of the low frequency ω on the change of B for a fixed Ω, the condition Ω≫ω is always ...
Chenggui, Yao, Yan, Liu, Meng, Zhan
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Resonant Frequencies of Circular Substrate Integrated Resonators
IEEE Microwave and Wireless Components Letters, 2008In this letter, the characterization of circular resonators realized in substrate integrated waveguide technology is presented. Resonances are found by setting up the equations of the scattering for an ensemble of metallic posts in parallel plates waveguide and considering the nontrivial solution to the corresponding homogeneous problem.
ARNIERI, EMILIO +3 more
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Resonant lines for frequency control
Electrical Engineering, 1935Vacuum tube oscillators for radio frequency signals above 25 megacycles may be controlled with a high degree of precision by resonant lines, and at lower frequencies may be used to obtain a larger power output than is obtainable from crystal oscillators.
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Resonant frequency of rectangular dielectric resonator antenna
2017 8th Annual Industrial Automation and Electromechanical Engineering Conference (IEMECON), 2017In this paper, Rectangular Dielectric Resonator Antenna (RDRA) is investigated theoretically. To investigate the RDRA, the antenna is assumed as a cavity. The wave equation is solved inside the cavity antenna. Simple transcendental equation is given here to predict the resonant frequency of RDRA. One antenna prototype is simulated to verify our theory.
Sougata Hanra +8 more
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Resonant frequency tunableness of solidly mounted resonators
Proceedings of the 2010 Symposium on Piezoelectricity, Acoustic Waves and Device Applications, 2010The performance of solidly mounted resonator (SMR) depends on the thickness control of each layer. Since thickness variation is inevitable in film deposition, the resonant frequency will shift from the desired value. In order to calculate the required electrode thickness for a given resonant frequency, an SMR is treated as a combination of two ...
Chien-hao Liu, Yuan-fang Chou
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The Journal of the Acoustical Society of America, 2008
A device for detecting a resonant frequency comprises a sound source, a switch, a mixer, and a sound meter. The switch and mixer are capable of switching between a first state in which the switch and mixer output a measurement signal and a second state in which the switch and mixer output a synthesized signal containing the measurement signal and the ...
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A device for detecting a resonant frequency comprises a sound source, a switch, a mixer, and a sound meter. The switch and mixer are capable of switching between a first state in which the switch and mixer output a measurement signal and a second state in which the switch and mixer output a synthesized signal containing the measurement signal and the ...
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1998
Elastic constants are NOT CONSTANT!! They are NOT fundamental, immutable properties of a material. On the contrary, they are sensitive to variations in microstructure (e.g., due to heat treatment), crystallographic orientation and composition (even within prescribed limits).
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Elastic constants are NOT CONSTANT!! They are NOT fundamental, immutable properties of a material. On the contrary, they are sensitive to variations in microstructure (e.g., due to heat treatment), crystallographic orientation and composition (even within prescribed limits).
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