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  • 1
    Online Resource
    Online Resource
    The Use of Acoustic Vectors Decomposition of Sound Fields to Vibroacoustic Protection on Ships
    Walter de Gruyter GmbH ; 2017
    In:  Archives of Acoustics Vol. 42, No. 2 ( 2017-06-27), p. 207-212
    Details
    In: Archives of Acoustics, Walter de Gruyter GmbH, Vol. 42, No. 2 ( 2017-06-27), p. 207-212
    Abstract: In this paper, numerous examples will be illustrated as principles of applying the sound intensity measurements to practical problems at the noise abatement on ships and offshore constructions. The paper presents the results of transmission loss measurements together with flanking transmission for ship bulkheads and partitions with doors and windows. Investigations carried out with sound intensity measurement techniques will be compared against those made by classical methods. Finally for a few examples, the graphic presentation of spatial distribution of sound intensity vectors risen close to vibrating ship cabin partitions and inside the cabin will be shown in 2D and 3D graphical form. As a result, a two-dimensional acoustic wave flow map of time-averaged active intensity vectors propagated along curved streamlines and a vector perpendicular to measured plane are graphically illustrated. The technique of acoustic vectors decomposition of sound fields described, can enrich the knowledge of the mechanism of acoustic energy flux through ship partitions.
    Type of Medium: Online Resource
    ISSN: 2300-262X
    URL: Article
    DOI: 10.1515/aoa-2017-0023
    Language: Unknown
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2017
    detail.hit.zdb_id: 2636265-X
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  • 2
    Online Resource
    Online Resource
    Acoustic Intensity Imaging Methods for in-situ Wave Propagation
    Polish Academy of Sciences Chancellery ; 2010
    In:  Archives of Acoustics Vol. 35, No. 2 ( 2010-01-31)
    Details
    In: Archives of Acoustics, Polish Academy of Sciences Chancellery, Vol. 35, No. 2 ( 2010-01-31)
    Type of Medium: Online Resource
    ISSN: 0137-5075
    URL: Article
    DOI: 10.2478/v10168-010-0025-1
    Language: Unknown
    Publisher: Polish Academy of Sciences Chancellery
    Publication Date: 2010
    detail.hit.zdb_id: 2636265-X
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  • 3
    Online Resource
    Online Resource
    Silent Ships - a New Challenge for the Shipbuilding Industry
    Science Publishing Group ; 2021
    In:  American Journal of Modern Physics Vol. 10, No. 4 ( 2021), p. 71-
    Details
    In: American Journal of Modern Physics, Science Publishing Group, Vol. 10, No. 4 ( 2021), p. 71-
    Type of Medium: Online Resource
    ISSN: 2326-8867
    URL: Article
    DOI: 10.11648/j.ajmp.20211004.12
    Language: English
    Publisher: Science Publishing Group
    Publication Date: 2021
    detail.hit.zdb_id: 2717146-2
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  • 4
    Online Resource
    Online Resource
    The Analysis of Vibration Transmitted by Hydraulic Drilling Machines in Underwater Working Conditions
    SAGE Publications ; 1992
    In:  Journal of Low Frequency Noise, Vibration and Active Control Vol. 11, No. 3 ( 1992-09), p. 89-92
    Details
    In: Journal of Low Frequency Noise, Vibration and Active Control, SAGE Publications, Vol. 11, No. 3 ( 1992-09), p. 89-92
    Abstract: There is little knowledge of the effect of whole-body vibration on a diver working under water. During underwater work the diver is subject to the direct influence of the tool vibration as well as vibration transmitted to his body. The sole aim of this study was hand-arm vibration from hydraulic drills. The test proved that the allowed vibration level was exceeded, especially within the low frequency region from 6.3 Hz up to 125 Hz. These initial results have been applied to the design of a new tool with reduced vibration levels.
    Type of Medium: Online Resource
    ISSN: 1461-3484 , 2048-4046
    URL: Article
    DOI: 10.1177/026309239201100303
    Language: English
    Publisher: SAGE Publications
    Publication Date: 1992
    detail.hit.zdb_id: 2025887-2
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  • 5
    Online Resource
    Online Resource
    Experimental Acoustic Flow Analysis Inside a Section of an Acoustic Waveguide
    Polish Academy of Sciences Chancellery ; 2013
    In:  Archives of Acoustics Vol. 38, No. 2 ( 2013-06-1), p. 211-216
    Details
    In: Archives of Acoustics, Polish Academy of Sciences Chancellery, Vol. 38, No. 2 ( 2013-06-1), p. 211-216
    Abstract: Noise propagation within ducts is of practical concern in many areas of industrial processes where a fluid has to be transported in piping systems. The paper presents experimental data and visualization of flow in the vicinity of an abrupt change in cross-section of a circular duct and on obstacles inside where the acoustic wave generates nonlinear separated flow and vortex fields. For noise produced by flow wave of low Mach number, laminar and turbulent flows are studied us- ing experimental sound intensity (SI) and laser particle image velocimetry (PIV) technique adopted to acoustics (A-PIV). The emphasis is put on the development and application of these methods for better understanding of noise generation inside the acoustic ducts with different cross-sections. The intensity distribution inside duct is produced by the action of the sum of modal pressures on the sum of modal particle velocities. However, acoustic field is extremely complicated because pressures in non-propagating (cut-off) modes cooperate with particle velocities in propagating modes, and vice versa. The discrete frequency sound is strongly influenced by the transmission of higher order modes in the duct. By under- standing the mechanism of energy in the sound channels and pipes we can find the best solution to noise abatement technology. In the paper, numerous methods of visualization illustrate the vortex flow as an acoustic velocity or sound intensity stream which can be presented graphically. Diffraction and scattering phenomena occurring inside and around the open-end of the acoustic duct are shown.
    Type of Medium: Online Resource
    ISSN: 0137-5075
    URL: Article
    DOI: 10.2478/aoa-2013-0025
    Language: Unknown
    Publisher: Polish Academy of Sciences Chancellery
    Publication Date: 2013
    detail.hit.zdb_id: 2636265-X
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  • 6
    Online Resource
    Online Resource
    Multi-Modal Acoustic Flow Decomposition Examined in a Hard Walled Cylindrical Duct
    Polish Academy of Sciences Chancellery ; 2015
    In:  Archives of Acoustics Vol. 39, No. 2 ( 2015-03-1), p. 289-296
    Details
    In: Archives of Acoustics, Polish Academy of Sciences Chancellery, Vol. 39, No. 2 ( 2015-03-1), p. 289-296
    Abstract: Flow fields could be of great interest in the study of sound propagation in aeroengines. For ducts with rigid boundaries, the fluid-resonant category may contribute significantly to unwanted noise. An understanding of the multi-modal propagation of acoustic waves in ducts is of practical interest for use in the control of noise in, for example, aero-engines, automotive exhaust and heating or ventilation systems. The purpose of our experiments was to test the acoustic energy transmission of duct modes based on studies carried out by the sound intensity technique. Sound intensity patterns in circular duct are discussed of modal energy analysis with particular reference to proper orthogonal decomposition and dynamic mode decomposition. The authors try to justify some advantages of the sound intensity experimental research in this area. In the paper, the wide-band sound signal propagated from source approximated with loudspeaker in hard-walled duct is imaged using a sound intensity - based approach. For a simple duct geometry, the sound intensity field is examined visually and by performing a modal decomposition greater insight into the acoustic structures is obtained. The image of sound intensity fields below and above “cut-off” frequency region are found to compare acoustic modes which might resonate in duct.
    Type of Medium: Online Resource
    ISSN: 2300-262X
    URL: Article
    DOI: 10.2478/aoa-2014-0033
    Language: Unknown
    Publisher: Polish Academy of Sciences Chancellery
    Publication Date: 2015
    detail.hit.zdb_id: 2636265-X
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  • 7
    Online Resource
    Online Resource
    OVERVIEW OF THE EXPERIMENTAL DETERMINATION OF ACOUSTIC FLOW ON THE BASIS OF SOUND INTENSITY MEASUREMENTS
    AGHU University of Science and Technology Press ; 2014
    In:  Mechanics and Control Vol. 33, No. 1 ( 2014), p. 26-
    Details
    In: Mechanics and Control, AGHU University of Science and Technology Press, Vol. 33, No. 1 ( 2014), p. 26-
    Type of Medium: Online Resource
    ISSN: 2083-6759
    URL: Article
    DOI: 10.7494/mech.2014.33.1.26
    Language: English
    Publisher: AGHU University of Science and Technology Press
    Publication Date: 2014
    detail.hit.zdb_id: 2863533-4
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  • 8
    Online Resource
    Online Resource
    The application of sound intensity technique in research on noise abatement in ships
    Elsevier BV ; 1995
    In:  Applied Acoustics Vol. 44, No. 4 ( 1995), p. 341-351
    Details
    In: Applied Acoustics, Elsevier BV, Vol. 44, No. 4 ( 1995), p. 341-351
    Type of Medium: Online Resource
    ISSN: 0003-682X
    URL: Article
    DOI: 10.1016/0003-682X(94)00031-P
    Language: English
    Publisher: Elsevier BV
    Publication Date: 1995
    detail.hit.zdb_id: 1501311-X
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