acoustic mode

acoustic mode

[ə′küs·tik ′mōd]
(solid-state physics)
The type of crystal lattice vibrations which for long wavelengths act like an acoustic wave in a continuous medium, but which for shorter wavelengths approach the Debye frequency, showing a dispersive decrease in phase velocity.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
However, this show sees Hart in solo acoustic mode where he shows his mastery of the form which his mentors - Lead Belly, Charlie Patton, Skip James etc - entrusted to him.
Here, the upper frequency of interest was initially chosen to be 450 Hz, in order to include the effect of the second circumferential acoustic mode. The maximum allowable element size was thus calculated as
In the cylindrical waveguide, there is just one propagating acoustic mode below some cut-off frequency.
A comparison of the natural frequencies between the analytical solution and the numerical solution is presented in Table 1, and Figure 2 illustrates the first three numerical acoustic mode shapes of the freezer cavity.
On the basis of the established simulation model, the correctness of the finite element modeling and simulation computation was verified from three aspects, acoustic mode, cavity acoustic response, and in-cavity acoustic response of laying MF material.
It was clarified that the self-sustained oscillations were amplified by coupling between instability in the shear layer and the acoustic mode in the direction of cavity depth.
This analysis exploited knowledge of the climatology of the region and the spatially averaged, acoustic mode resolving thermometry that provided depth resolution.
Ultimately, this indicates that the phase velocity or eigenvalue found for the problem is identical to the acoustic eigenvalue and indicates that the stress (or traction) eigenvector for this value is equivalent to an acoustic mode eigenvalue.
where [[mu].sub.uw] = [square root of ([(u[pi]/a).sup.2] + [(w[pi]/b).sup.2]) - [([omega]/[c.sub.a]).sup.2], u and w are the acoustic mode numbers, U and W are the numbers of acoustic modes used in the x and y directions, and [L.sub.uw] and [N.sub.uw] are coefficients to be determined in the following step.
For example, an air space or room is considered as a single SEA acoustic subsystem and the energy per acoustic mode is determined.
Catch Emma in her more familiar acoustic mode at Boston Bar (Beer Engine) tonight from 8.00pm, and at G Casino (with The Undercovers) THRILL: Emma meets Kylie at Ricoh Arena on August 7 at 8pm.
Call: 01792 475715 The Guns @Barfly, Cardiff (Thursday): They're top of high-energy, full-throttle rock, but how will they fare here in stripped down acoustic mode? Info: 029 2039 6589 The Doors Alive @Barfly, Cardiff (Saturday): Leather-trousered tribute larks from the Lizard King copyists.

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