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  • 1
    Online Resource
    Online Resource
    Determination of radiated sound power from acoustic sources using the VBSP method and a transparent acoustic boundary
    Acoustical Society of America (ASA) ; 2022
    In:  The Journal of the Acoustical Society of America Vol. 151, No. 4_Supplement ( 2022-04-01), p. A227-A227
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 151, No. 4_Supplement ( 2022-04-01), p. A227-A227
    Abstract: Significant progress has been made to develop a vibration-based sound power (VBSP) method as an alternative means to determine the radiated acoustic energy from structures. This method has been validated for flat plates, cylindrical-shells, simple curved plates, and arbitrarily curved panels. However, many acoustic sources, such as a blender or motor, have sound power contributions that are enclosed within the structure and therefore cannot be scanned properly using a vibrometer. A rigid enclosure with a single mylar face for one side of the enclosure was fabricated to enclose the acoustic source, such as an “acoustic tent” around the structure of interest, so that the VBSP method could be applied to and obtain the radiated sound power. Due to the nature of the sources, this application of the VBSP method will have limitations that are not present in the aforementioned work. A calibration curve was developed to account for the effects that the tent had on the sources used for testing and used to correct the experimental VBSP sound power measurements from the acoustic tent. Results will be shown comparing the sound power obtained from the VBSP method with the sound power of the source in a reverberation chamber using ISO 3741. Funding for this work was provided by the National Science Foundation (NSF). [Funding for this work was provided by the National Science Foundation (NSF).]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/10.0011144
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2022
    detail.hit.zdb_id: 1461063-2
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  • 2
    Online Resource
    Online Resource
    Looking Backward, Looking Forward: MLA Members Speak
    Modern Language Association (MLA) ; 2000
    In:  PMLA/Publications of the Modern Language Association of America Vol. 115, No. 7 ( 2000-12), p. 1986-2078
    Details
    In: PMLA/Publications of the Modern Language Association of America, Modern Language Association (MLA), Vol. 115, No. 7 ( 2000-12), p. 1986-2078
    Type of Medium: Online Resource
    ISSN: 0030-8129 , 1938-1530
    URL: Article
    DOI: 10.2307/463623
    RVK:
    EA 1000
    Language: English
    Publisher: Modern Language Association (MLA)
    Publication Date: 2000
    detail.hit.zdb_id: 2439580-8
    detail.hit.zdb_id: 209526-9
    detail.hit.zdb_id: 2066864-8
    SSG: 7,11
    SSG: 7,24
    SSG: 7,12
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  • 3
    Online Resource
    Online Resource
    Time domain wave separation using multiple microphones
    Acoustical Society of America (ASA) ; 2010
    In:  The Journal of the Acoustical Society of America Vol. 128, No. 1 ( 2010-07-01), p. 195-205
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 128, No. 1 ( 2010-07-01), p. 195-205
    Abstract: Methods of measuring the acoustic behavior of tubular systems can be broadly characterized as steady state measurements, where the measured signals are analyzed in terms of infinite duration sinusoids, and reflectometry measurements which exploit causality to separate the forward and backward going waves in a duct. This paper sets out a multiple microphone reflectometry technique which performs wave separation by using time domain convolution to track the forward and backward going waves in a cylindrical source tube. The current work uses two calibration runs (one for forward going waves and one for backward going waves) to measure the time domain transfer functions for each pair of microphones. These time domain transfer functions encode the time delay, frequency dependent losses and microphone gain ratios for travel between microphones. This approach is applied to the measurement of wave separation, bore profile and input impedance. The work differs from existing frequency domain methods in that it combines the information of multiple microphones within a time domain algorithm, and differs from existing time domain methods in its inclusion of the effect of losses and gain ratios in intermicrophone transfer functions.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.3392441
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2010
    detail.hit.zdb_id: 1461063-2
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  • 4
    Online Resource
    Online Resource
    Experimental techniques for the visualization of the acoustic fields radiating from brass musical instruments
    Acoustical Society of America (ASA) ; 2017
    In:  The Journal of the Acoustical Society of America Vol. 142, No. 4_Supplement ( 2017-10-01), p. 2544-2544
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 142, No. 4_Supplement ( 2017-10-01), p. 2544-2544
    Abstract: Radiation from brass instrument bells under artificial excitation can be visualized using a number of experimental techniques. In this work, we present two different approaches: Schlieren optical imaging using a high speed camera and acoustic 2D scanning using a linear microphone array. The potentials and limitations of both methods, as well as their methodological requirements, are discussed. Examples of measurements on several instruments are presented. Schlieren optical imaging is applicable for the detection of large amplitude wavefronts formed by nonlinear wave steepening and is this is particularly sensitive to the high frequencies that form within these waves. The 2D scanning linear microphone array on the other hand can, in principle, measure all frequencies and the use of the exponential sine sweep method allows any nonlinear behaviour (in the loudspeaker and microphone or in the air) to be removed to get an accurate measurement of the linear radiation field for any frequency of choice within the measurement bandwidth.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.5014298
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2017
    detail.hit.zdb_id: 1461063-2
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  • 5
    Online Resource
    Online Resource
    Acoustic reflectometry in the manufacture of reproductions of historical wind instruments
    Acoustical Society of America (ASA) ; 2001
    In:  The Journal of the Acoustical Society of America Vol. 110, No. 5_Supplement ( 2001-11-01), p. 2649-2649
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 110, No. 5_Supplement ( 2001-11-01), p. 2649-2649
    Abstract: Acoustic reflectometry has become a well-established technique for investigating the internal bore profile of cylindrically symmetrical ducts. Although the method has previously been applied with some success to the study of musical wind instrument bores, there are practical problems which limit the accuracy of bore reconstruction of instruments which are long or widely flaring, or which have side finger holes. This paper reports on a collaboration with Christopher Monk Instruments Ltd., a London-based firm specializing in the reproduction of cornetts and serpents. These are lip-reed instruments with side finger holes, and a curved bore center line which inhibits the use of conventional bore measuring techniques. It is demonstrated that acoustic reflectometry can provide bore profiles of these instruments with sufficient precision to be a valuable guide in their construction or repair. The precautions necessary to achieve this level of accuracy are described, and prospects for further refinements are discussed. [The collaboration of Keith Rogers and Jeremy West of CMI Ltd. is gratefully acknowledged. Work supported by the Engineering and Physical Sciences Research Council, U.K.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4776996
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2001
    detail.hit.zdb_id: 1461063-2
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  • 6
    Online Resource
    Online Resource
    Book reviews
    Informa UK Limited ; 1994
    In:  African Studies Vol. 53, No. 1 ( 1994-01), p. 151-176
    Details
    In: African Studies, Informa UK Limited, Vol. 53, No. 1 ( 1994-01), p. 151-176
    Type of Medium: Online Resource
    ISSN: 0002-0184 , 1469-2872
    URL: Article
    DOI: 10.1080/00020189408707796
    RVK:
    EQ 1000
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 1994
    detail.hit.zdb_id: 2026322-3
    SSG: 6,31
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  • 7
    Online Resource
    Online Resource
    Characterization of free field radiation in brass instrument horns under swept sine excitation using a linear microphone array
    Acoustical Society of America (ASA) ; 2017
    In:  The Journal of the Acoustical Society of America Vol. 141, No. 5_Supplement ( 2017-05-01), p. 3723-3723
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 141, No. 5_Supplement ( 2017-05-01), p. 3723-3723
    Abstract: A linear array with 23 microphones is used to scan a planar section of the sound field radiated into an anechoic environment by a range of brass instruments excited by a sinusoidal sine sweep. The planar section contains the symmetry axis of the bell and covers a rectangular area of 0.9 by 0.6 metres, starting at the plane of the bell and extending away from it along the longest side. The linear microphone array is perpendicular to the symmetry axis and is stepped along the axis. The resulting matrix of signals is processed to separate the linear and non-linear parts of the response; the three-dimensional pressure distribution in the sound field is deduced on the assumption that the field is cylindrically symmetric. This data then allows the visualization and further analysis of the frequency dependence of radiated wave fronts in brass instrument bells. Comparison is drawn between the observations and the predictions of several popular radiation models.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4988158
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2017
    detail.hit.zdb_id: 1461063-2
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