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  • Acoustical Society of America (ASA)  (26)
  • 1
    Online Resource
    Online Resource
    Acoustical Society of America (ASA) ; 1985
    In:  The Journal of the Acoustical Society of America Vol. 78, No. 2 ( 1985-08-01), p. 738-746
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 78, No. 2 ( 1985-08-01), p. 738-746
    Abstract: The coupled elastic and acoustic response of a system of cylindrical and toroidal shells enclosing an acoustic medium is presented in two parts. The first part develops the theory to model the elastodynamics of cylindrical and toroidal segments of shell. The elastic simulation is based on transfer matrices while the acoustic simulation adapts a Green’s function and curved surface elements. Equilibrium of the acoustic pressure and internal elastic reactions of the shell and compatibility between the acoustic and elastic accelerations at the shell–fluid interface determine the coupled response. The second part discusses numerical results based on the theory for both shell configurations with a plane of symmetry as well as asymmetric ones.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    RVK:
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1985
    detail.hit.zdb_id: 1461063-2
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  • 2
    Online Resource
    Online Resource
    Acoustical Society of America (ASA) ; 2012
    In:  The Journal of the Acoustical Society of America Vol. 132, No. 3 ( 2012), p. 1876-
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 132, No. 3 ( 2012), p. 1876-
    Type of Medium: Online Resource
    ISSN: 0001-4966
    RVK:
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2012
    detail.hit.zdb_id: 1461063-2
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  • 3
    Online Resource
    Online Resource
    Acoustical Society of America (ASA) ; 1993
    In:  The Journal of the Acoustical Society of America Vol. 93, No. 1 ( 1993-01-01), p. 324-327
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 93, No. 1 ( 1993-01-01), p. 324-327
    Abstract: The analysis of shells damped by a constrained viscoelastic layer is extended to toroidal segments. The absorber consists of thin curved strips bonded to the torus with a thin viscoelastic layer. When applied to the torus, the absorber is most effective on response modes with two or more circumferential waves. In this way it resembles the damped cylinder. However, for a given weight of absorber, the torus is damped more than the cylinder. The reason is that the torus induces and couples those circumstantial harmonics that are damped most effectively by this absorber.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    RVK:
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1993
    detail.hit.zdb_id: 1461063-2
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  • 4
    Online Resource
    Online Resource
    Acoustical Society of America (ASA) ; 2009
    In:  The Journal of the Acoustical Society of America Vol. 125, No. 4_Supplement ( 2009-04-01), p. 2753-2753
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 125, No. 4_Supplement ( 2009-04-01), p. 2753-2753
    Abstract: There are marked differences in how native speakers of Sinhala and English perceive the English /w/-/v/ distinction; Sinhala speakers who have learned English as a second language are typically near chance at identification and have less than half the discrimination sensitivity of native English speakers. This poor discrimination ability is remarkable because the acoustic cues for /w/ and /v/ are varied, being contrastive in formant frequencies, amount of frication, and amplitude envelopes. The present project explored these differences in auditory sensitivity by manipulating speech and nonspeech stimuli, with the aim of investigating how close an auditory stimulus needs to be to natural speech in order for cross-language perceptual differences to emerge. Synthesized VCV speech stimuli were created to model natural recordings. Nonspeech stimuli were created by removing dynamics from the stimuli (e.g., flat pitch and amplitude, no formant movement), producing a “buzz” that was acoustically similar to the speech stimuli. Discrimination results for these stimuli will be reported for native speakers of Sinhala and English, in order to evaluate whether cross-language specialization for speech may occur at a precategorical auditory-phonetic level of processing, or whether specialization is contingent on the stimuli being perceived as intelligible speech.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    RVK:
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2009
    detail.hit.zdb_id: 1461063-2
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  • 5
    Online Resource
    Online Resource
    Acoustical Society of America (ASA) ; 1996
    In:  The Journal of the Acoustical Society of America Vol. 99, No. 6 ( 1996-06-01), p. 3513-3527
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 99, No. 6 ( 1996-06-01), p. 3513-3527
    Abstract: The analysis of transient linear elastic waves in Ref. [J. Acoust. Soc. Am. 94, 172–184 (1993)] is extended to 2-D axisymmetric finite layered periodic and weakly coupled media. Two essential features distinguishing 2-D propagation are flexure and increased dispersion. To allow separation of z and r eigenproblems, a boundary condition that approximates simple supports is adopted that yields nonorthogonal eigenfunctions in the modal analysis.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    RVK:
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1996
    detail.hit.zdb_id: 1461063-2
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  • 6
    Online Resource
    Online Resource
    Acoustical Society of America (ASA) ; 1985
    In:  The Journal of the Acoustical Society of America Vol. 77, No. 3 ( 1985-03-01), p. 1027-1037
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 77, No. 3 ( 1985-03-01), p. 1027-1037
    Abstract: Presented are several methods to study a system of tiles bonded elastically to a finite flexible plate responding to an impulse. First, a one-dimensional (1-D) approximation to the system is constructed using Timoshenko beam theory and transfer matrices. This simulates a strip one tile wide. Modal analysis determines the transient response to an impulse of short duration. Also presented are parametric studies of the effect of bond stiffness and the effect of stiffening from inplane stresses produced by large out-of-plane deflections. A two-dimensional (2-D) model is constructed from the eigenfunctions of the 1-D model in a Galerkin method using pairwise products of the 1-D modes as trial functions. Comparison of the two models establishes a factor applied to peak impulse pressure for results to agree.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    RVK:
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1985
    detail.hit.zdb_id: 1461063-2
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  • 7
    Online Resource
    Online Resource
    Acoustical Society of America (ASA) ; 1983
    In:  The Journal of the Acoustical Society of America Vol. 74, No. 5 ( 1983-11-01), p. 1583-1596
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 74, No. 5 ( 1983-11-01), p. 1583-1596
    Abstract: Longitudinal and transverse standing waves in rigid cylindrical and conical cavities enclosing an inhomogeneous medium are studied. First, the inhomogeneity in speed of sound c is analyzed in terms of c gradient location, intensity, and shape. The energy transmission of longitudinal waves is optimum when the c gradient is located at pressure nodes. The energy transmission efficiency of transverse waves improves when a cone connects c1 and c2 regions of different cross section. The inhomogeneity in both density and speed of sound is then considered and differences between the two types of inhomogeneity are explained.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    RVK:
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1983
    detail.hit.zdb_id: 1461063-2
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  • 8
    Online Resource
    Online Resource
    Acoustical Society of America (ASA) ; 2016
    In:  The Journal of the Acoustical Society of America Vol. 139, No. 4 ( 2016-04-01), p. 1799-1809
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 139, No. 4 ( 2016-04-01), p. 1799-1809
    Abstract: Cross-language differences in speech perception have traditionally been linked to phonological categories, but it has become increasingly clear that language experience has effects beginning at early stages of perception, which blurs the accepted distinctions between general and speech-specific processing. The present experiments explored this distinction by playing stimuli to English and Japanese speakers that manipulated the acoustic form of English /r/ and /l/, in order to determine how acoustically natural and phonologically identifiable a stimulus must be for cross-language discrimination differences to emerge. Discrimination differences were found for stimuli that did not sound subjectively like speech or /r/ and /l/, but overall they were strongly linked to phonological categorization. The results thus support the view that phonological categories are an important source of cross-language differences, but also show that these differences can extend to stimuli that do not clearly sound like speech.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    RVK:
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2016
    detail.hit.zdb_id: 1461063-2
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  • 9
    Online Resource
    Online Resource
    Acoustical Society of America (ASA) ; 1982
    In:  The Journal of the Acoustical Society of America Vol. 71, No. 6 ( 1982-06-01), p. 1335-1346
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 71, No. 6 ( 1982-06-01), p. 1335-1346
    Abstract: The acoustic propagation in a rigid torus is analyzed using a Green’s function method. Three types of surface elements are developed; a flat quadrilateral element used in modeling polygonal cavities, a curved conical element appropriate for surfaces with one curvature, and a toroidal element developed for such doubly curved surfaces as the torus. Curved elements are necessary since the acoustic pressure is sensitive to slope discontinuities between consecutive surface elements especially near cavity resonances. The acoustic characteristics of the torus are compared to those of a bend of square cross section for a frequency range that includes the transverse acoustic resonance. Two equivalences between the different sections are tested; the first conserves curvature and cross-sectional dimension while the second matches transverse resonance and duct volume. The second equivalence accurately matches the acoustic characteristics of the torus up to the cutoff frequency corresponding to a mode with two circumferential waves.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    RVK:
    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
    Acoustical Society of America (ASA) ; 1985
    In:  The Journal of the Acoustical Society of America Vol. 78, No. 2 ( 1985-08-01), p. 747-757
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 78, No. 2 ( 1985-08-01), p. 747-757
    Abstract: General systems of cylindrical and toroidal shells enclosing an acoustic medium are studied by their response to acoustic excitation by a plane wave with harmonic time dependence. Noteworthy features are: (i) at frequencies low compared to the fundamental the torus’ cross section deforms as an ogive due to meridional curvature, (ii) coupled elastic resonances lag resonances of the empty system, (iii) additional circumferential harmonics appear besides 0 and 1 when the exciting frequency is closest to resonances of the shell’s cross section, (iv) longitudinal acoustic resonances lag resonances of the system with rigid walls, and (v) nonresonant response peaks occur at coincidence. The present analysis demonstrates the inadequacy of beam theory to model the response of short and thin shell configurations at frequencies above the fundamental elastic resonance.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    RVK:
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1985
    detail.hit.zdb_id: 1461063-2
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