Acoustic transfer admittance of cylindrical cavities

Guianvarc'H, Cécile; Durocher, Jean-Noël; Bruneau, Michel; Bruneau, Anne‐Marie

doi:10.1016/j.jsv.2005.08.019

Cited by 13 publications

(18 citation statements)

References 8 publications

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“…The absolute value of the displacement field of the membrane, shown in Figures 3and 4for an incident pressure p inc = 1Pa,r espectively for ap lanar backing electrode (ε 0 = 18 µm, α = 0) and aconvex one (ε 0 = 18 µm, α = 0.4),isaquantity of interest (asmentioned belowin the conclusion [16,17]). …”

Section: Resultsmentioning

confidence: 99%

“…Moreover, this theoretical refinement would be appropriate when precise analysis of both the shape and the local, r-dependant impedance is needed (asfor example in the reciprocity calibration technique [16])o ri n the measurement of thermo-physical properties in ag asfilled spherical resonator wherein acoustic resonances occur [17], among others. Actually,i nt he lower frequency range (upto20kHz for example)and for usual dimensions (half or quarter inches), lumped circuit elements that could be deriveda ssuming appropriate approximations would provide accurate modelling in the usual situations (such modelling is beyond the scope of this paper).…”

Section: Resultsmentioning

confidence: 99%

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Fluid Layer Trapped Between a Plane, Circular Membrane and an Axisymmetrically Curved, Smooth Backing Wall: Analytical Model of the Dynamic Behaviour

Suu¹,

Durand²,

Bruneau³

2008

Acta Acustica united with Acustica

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Current electrostatic transducers are designed with aplanar perforated backing electrode while nowadays some authors suggest that anon planar backing wall would enhance their performances. Accurate analytic results for these newshapes of backing electrode are not available until nowwhereas current applications (metrology,miniaturisation)arise which need more refined modelling. Therefore the present paper aims at providing an analytical description of the strong coupling between afl uid layer trapped between an axisymmetrically curved smooth backing wall and acircularvibrating membrane (the thickness of the fluid layer depends on the radial coordinate) using modelling wherein viscosity,h eat conduction, inertia and compressibility of the fluid are considered, beyond realistic boundary conditions (nos lip condition and no temperature variations near the walls). Solutions are givenasthe sum of an expansion on eigenfunctions of the membrane in vacuo and an extended power series (using Frobenius method)toovercome the limitations of astandard electrical equivalent network analysis in the frequencyr ange of interest (upt o1 00 kHz for circular membranes approximately one millimetre in diameter). The results obtained provide tools for optimising the design of such small electrostatic transducers.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Fluid Layer Trapped Between a Plane, Circular Membrane and an Axisymmetrically Curved, Smooth Backing Wall: Analytical Model of the Dynamic Behaviour

Suu¹,

Durand²,

Bruneau³

2008

Acta Acustica united with Acustica

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show abstract

“…However, the acoustic transfer impedance of the coupler including the thermal conductivity effect of fluid must be modelled precisely to obtain the accurate sensitivity of microphones from the electrical transfer impedance [16]. The microphone parameters influence the acoustic transfer impedance which is derived from analytical calculations [12].…”

Section: Measurement Methodology and Instrumentationmentioning

confidence: 99%

Analysis of the Effect of Microphone Parameters in Reciprocity Calibrations Using Taguchi Method

Garg

Maji

2015

MAPAN

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The paper presents parametric study investigating the relative influence of the various microphone parameters affecting the closed coupler reciprocity measurements while computing the sensitivity of reference standard microphones using the well known MP.EXE program used by National Metrology Institutes of various countries. A design of experiments perspective using L 9 (3 4 ) orthogonal array and analysis of variance (ANOVA) method is presented for LS1P and LS2P microphones. The relative importance of microphone parameters on its sensitivity is evaluated in terms of percentage contribution using ANOVA methodology.

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“…where P 0 is the static pressure, V pa is the amplitude of volume variation in pistonphone, V p0 is the static volume of pistonphone, κ is the adiabatic index, E pv is the temperature transfer function of pistonphone, 26,27,[31][32][33] ω is the angular frequency, T p is the leakage time constant of pistonphone. 30 Underlined symbols represent complex quantities.…”

Section: Sensitivity Models (In Brief)mentioning

confidence: 99%

Theoretical study on the phase sensitivity of condenser type acoustic transducers at low frequencies

Liu

Zhang

et al. 2021

Journal of Low Frequency Noise, Vibration and Active Control

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The phase sensitivity of the condenser type acoustic transducers at low frequencies is crucial for locating large-scale natural and manmade activities, but is now commonly calibrated based on comparison methods. Although the primary method, which traces its sensitivity back to the international standard unit is few studied. Recently, the explicit sensitivity models of the condenser type acoustic transducers based on the laser-pistonphone technique are built, and can be used to study the phase responses of acoustic transducers at infrasonic frequencies. So that, in this paper, the phase sensitivities of acoustic transducers when its rear vent connected to the calibrating sound field or outside atmosphere are studied in detail. Secondly, time domain analysis of generated sound pressures by displacement excitation are derived to reveal the mechanism of phase variation. Calculations show two distinct sensitivities with 90° phase lead and −10° phase lag limits for vent in field and vent out field calibrations, which are dominated by the pressure leakage and heat conduction effects at infrasonic frequencies.

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Acoustic transfer admittance of cylindrical cavities

Cited by 13 publications

References 8 publications

Fluid Layer Trapped Between a Plane, Circular Membrane and an Axisymmetrically Curved, Smooth Backing Wall: Analytical Model of the Dynamic Behaviour

Fluid Layer Trapped Between a Plane, Circular Membrane and an Axisymmetrically Curved, Smooth Backing Wall: Analytical Model of the Dynamic Behaviour

Analysis of the Effect of Microphone Parameters in Reciprocity Calibrations Using Taguchi Method

Theoretical study on the phase sensitivity of condenser type acoustic transducers at low frequencies

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