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  • 1
    Online Resource
    Online Resource
    Acoustic resonances of thin cylindrical shells and the resonance scattering theory
    Acoustical Society of America (ASA) ; 1988
    In:  The Journal of the Acoustical Society of America Vol. 84, No. 2 ( 1988-08-01), p. 681-688
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 84, No. 2 ( 1988-08-01), p. 681-688
    Abstract: An experimental and theoretical study is presented of the properties of circumferential waves on thin-walled elastic, air-filled cylindrical shells immersed in water, and of their excitation by normally incident acoustic pulses of short duration. A spectral decomposition of the multiple echo pulses using the Numrich–de Billy method, and subsequent analysis by the resonance scattering theory (RST), reveal for an aluminum shell the presence of an ℓ=2 wave that can be identified with the S0 Lamb wave on a plate, and of an ℓ=0 wave that at low frequencies corresponds to a water-borne circumferential wave, not given by the Lamb theory of free-plate vibrations but by its extension to a plate with one-sided fluid loading. Calculations of complex pole resonances on aluminum and steel shells, as well as of the corresponding circumferential wave speeds and attenuations, serve to clarify the physical situation.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.396847
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1988
    detail.hit.zdb_id: 1461063-2
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  • 2
    Online Resource
    Online Resource
    HELICAL SURFACE WAVES ON A DIELECTRIC ROD
    Informa UK Limited ; 1986
    In:  Electromagnetics Vol. 6, No. 3 ( 1986-01), p. 209-216
    Details
    In: Electromagnetics, Informa UK Limited, Vol. 6, No. 3 ( 1986-01), p. 209-216
    Type of Medium: Online Resource
    ISSN: 0272-6343 , 1532-527X
    URL: Article
    DOI: 10.1080/02726348608915212
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 1986
    detail.hit.zdb_id: 2029053-6
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  • 3
    Online Resource
    Online Resource
    Acoustic resonances of thin cylindrical shells: Plate waves and the resonance scattering theory
    Acoustical Society of America (ASA) ; 1988
    In:  The Journal of the Acoustical Society of America Vol. 84, No. S1 ( 1988-11-01), p. S58-S58
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 84, No. S1 ( 1988-11-01), p. S58-S58
    Abstract: An experimental and theoretical study of acoustic backscattering from thin cylindrical shells immersed in water is described. Previous studies showed no general agreement for acoustic scattering from thin elastic shells. In the low-frequency domain (ka & lt; 150) and for shells such that the inner-outer radius b/a tends towards unity, two surface waves have been observed: a fast wave that exhibits a dispersion curve similar to that of the S0 plate mode, and a slow wave. This latter is observed in a limited frequency domain (outside the domain of the S0 wave), whose extent depends on the value of the ratio b/a for a given material. The previous studies interpreted this wave as the A0 plate mode, or as Stoneley-type mode. Presented here are relevant experimental results for duraluminum shells with b/a = 0.96. A comparison with theoretical calculations from the resonance scattering theory shows good agreement, as well as with the simple model of a solid plane plate. A theory of the physical properties of the slow wave, analyzed as a water-borne wave on a solid plate bounded by water on one side, and by air on the other has been developed.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.2026383
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1988
    detail.hit.zdb_id: 1461063-2
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  • 4
    Online Resource
    Online Resource
    Acoustic ringing response of the individual resonances of an elastic cylinder
    Acoustical Society of America (ASA) ; 1986
    In:  The Journal of the Acoustical Society of America Vol. 80, No. 4 ( 1986-10-01), p. 1161-1169
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 80, No. 4 ( 1986-10-01), p. 1161-1169
    Abstract: The results of a theoretical and experimental study concerning the ringing response of the individual resonances of a submersed elastic cylinder, insonified at normal incidence by sinusoidal pulses of relatively long duration, are presented. This ringing consists of a series of superimposed responses, comprising the specular reflection, and a succession of creeping waves which at resonance add in phase to synthesize the ringing response of an individual elastic-body resonance, provided the pulse spectrum is sufficiently narrow; off resonance, the ringing disappears. Analytically and experimentally obtained echoes from cylindrical targets support this interpretation and are correlated with complex-frequency poles of the scattering amplitude.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.393806
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1986
    detail.hit.zdb_id: 1461063-2
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  • 5
    Online Resource
    Online Resource
    Sound scattering from elastic objects and their complex eigenfrequencies
    Acoustical Society of America (ASA) ; 1982
    In:  The Journal of the Acoustical Society of America Vol. 71, No. S1 ( 1982-04-01), p. S68-S68
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 71, No. S1 ( 1982-04-01), p. S68-S68
    Abstract: A variety of surface waves is created at a smooth elastic target during acoustic scattering, including internal Rayleigh-and whispering-gallery type elastic waves, and external Franz-type creeping waves. Previously, we studied these using a Watson transformation, searching for poles of the scattering amplitude in the complex mode-number plane. The Singularity Expansion Method (SEM) of radar scattering instead characterizes the amplitude by its poles in the complex frequency plane. It is shown that each surface wave contributes a well-defined set of complex-frequency poles, and that the phase and group velocity dispersion curves of both elastic-type and Franz-type waves may be obtained from this set of poles. This approach is here carried through for the case of spherical and infinite-cylindrical elastic targets, and the ensuing dispersion curves are shown to characterize the surface waves as to Rayleigh or whispering gallery type. [H. Überall is also at Catholic University, Washington, DC, sponsored by the Office of Naval Research.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.2019517
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1982
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  • 6
    Online Resource
    Online Resource
    Acoustically induced stresses in elastic cylinders and their visualization
    Acoustical Society of America (ASA) ; 1987
    In:  The Journal of the Acoustical Society of America Vol. 82, No. 4 ( 1987-10-01), p. 1378-1385
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 82, No. 4 ( 1987-10-01), p. 1378-1385
    Abstract: The interior field in elastic cylinders immersed in a fluid and subject to an incident acoustic plane wave has been studied here via an application of the resonance scattering theory (RST), first formulated by Flax et al. [J. Acoust. Soc. Am. 63, 723 (1978)]. The interior field has been shown to consist solely of resonant amplitudes, with a substantial amount of penetration of the incident field into the scatterer occurring only at and near-resonance frequencies. Experimental measurements of stress distributions in a finite glass cylinder isonified by a normally incident acoustic pulse and viewed by axially transmitted light are presented as a function of ka (range of 5–55). The results show that the largest variations in light intensity occur for specific values of ka that correspond to resonance modes of the elastic glass cylinder. A model of the dynamics of the interior motions inside such a cylinder, and corresponding strain equations, are developed and combined with birefringence expressions for the purpose of predicting the light distributions. The elastic body is shown to undergo resonances in the radial and angular directions, except for the merely radial motions of the breathing mode. Calculated light distributions are shown to correspond to measured distributions.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.395272
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1987
    detail.hit.zdb_id: 1461063-2
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  • 7
    Online Resource
    Online Resource
    Eigenfrequencies of elastic cylinders and shells; surface waves generated by normally and non-normally incident sound
    Acoustical Society of America (ASA) ; 1985
    In:  The Journal of the Acoustical Society of America Vol. 78, No. S1 ( 1985-11-01), p. S76-S77
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 78, No. S1 ( 1985-11-01), p. S76-S77
    Abstract: We obtain the characteristic equation of an elastic cylinder, or cylindrical shell, immersed in a fluid and enclosing another fluid for vibrations containing both azimuthal and axial components. Numerical solutions are found for aluminum and steel cylinders, in the form of distinct “layers” of roots in the complex frequency plane, which may be interpreted as the resonances of azimuthal or helical surface waves around the shell. Rayleigh waves, Stoneley waves, and Lamb (whispering gallery) waves are identified and the interaction of Rayleigh and Stoneley branches at low frequency is clarified. Surface wave speeds and attenuations are obtained as functions of frequency. [Work supported by the Office of Naval Research.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.2022991
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1985
    detail.hit.zdb_id: 1461063-2
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  • 8
    Online Resource
    Online Resource
    A generalization of Rosen’s mathematical formalism for probabilistic dynamical theories
    Springer Science and Business Media LLC ; 1969
    In:  Lettere al Nuovo Cimento Vol. 1, No. 4 ( 1969-2), p. 214-216
    Details
    In: Lettere al Nuovo Cimento, Springer Science and Business Media LLC, Vol. 1, No. 4 ( 1969-2), p. 214-216
    Type of Medium: Online Resource
    ISSN: 0375-930X , 1827-613X
    URL: Article
    DOI: 10.1007/BF02752483
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1969
    detail.hit.zdb_id: 2455604-X
    detail.hit.zdb_id: 2426247-X
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  • 9
    Online Resource
    Online Resource
    Propagation of acoustic surface-wave pulses
    Acoustical Society of America (ASA) ; 1982
    In:  The Journal of the Acoustical Society of America Vol. 72, No. S1 ( 1982-11-01), p. S98-S98
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 72, No. S1 ( 1982-11-01), p. S98-S98
    Abstract: Surface waves on impenetrable or on elastic objects, produced by acoustic scattering or by other mechanisms, show pronounced dispersion effects. Their dispersion curves may be obtained from the resonances exhibited by their amplitude function either in the complex frequency plane (“SEM” or singularity expansion method poles) or in the complex mode number plane (“Watson poles” or “Regge poles”) [such acoustic resonances have recently been observed and analyzed by Maze, Taconet, and Ripoche, Phys. Lett. A 84, 309 (1981)]. Accordingly, the propagation of surface-wave pulses, and their arrival times, are determined by their group velocity. This is demonstrated by summing the normal-mode series of the surface wave portion of scattering amplitudes on spherical and cylindrical surfaces, using a stationary-phase approach. At the stationary points, which determine the pulse arrival times, there occurs a coherent summation (constructive interference) of the normal modes, and the stationary condition is recognized to lead to the correct propagation of the pulses with group velocity. [H. Überall is also at Catholic University, Washington, DC and is additionally supported by ONR.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.2020180
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1982
    detail.hit.zdb_id: 1461063-2
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  • 10
    Online Resource
    Online Resource
    Interior dynamics of acoustic scattering from elastic cylindrical targets
    Acoustical Society of America (ASA) ; 1985
    In:  The Journal of the Acoustical Society of America Vol. 77, No. S1 ( 1985-04-01), p. S78-S78
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 77, No. S1 ( 1985-04-01), p. S78-S78
    Abstract: The interior fields in a glass cylinder, immersed in water and subject to an incident acoustic plane wave, are studied via an application of the resonance theory of acoustic scattering. They consist of resonant amplitudes only, and substantial penetration of the incident field into the scatterer occurs only at or near resonance frequencies. The dynamics of the interior motions is investigated here; the results are compared to, and agree with, experimentally measured fields inside glass cylinders by the method of optic-elastic birefringence. The elastic body is shown to undergo resonances in the radial and angular directions, except for the case of the breathing mode. [Supported by the Office of Naval Research.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.2022509
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1985
    detail.hit.zdb_id: 1461063-2
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