The dynamics of low-frequency signal acoustic intensity vector vortex structure in shallow sea
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摘要
Spatiotemporal vector and phase properties of interference field of low-frequency signalling tone between three local vortices in a real shallow sea wave-guide have been studied.It has been demonstrated that in the field of constructive interference,components of particle velocity field and acoustic pressure are coherent.As a consequence the transfer of signal energy alog the axis of a shallow sea wave-guide is accomplished with plane wave.Physical objects are detected in the field of destructive interference,which,according to known deterministic signs,can be defined as local vortices of the intensity vector.A large-scale vorticity with acoustic intensity vector curl,components different from zero originates in the vicinity of local vortices.Regular particle displacements of local vortices have been detected against combined receiving device phase centre along the axis of a wave-guide.It has been demonstrated that the structure of vortices depends on signal/noise ratio.Local vortices and vorticity form vortex structure of vector acoustic field.Signalling tone with frequency of 88 ± 1 Hz from near-surface moving sound source was taken into consideration.Introduced results of full-scale experiment expand our concepts of real fundamental properties of shallow sea acoustic field and are to be considered in theoretical models.
Spatiotemporal vector and phase properties of interference field of low-frequency signalling tone between three local vortices in a real shallow sea wave-guide have been studied.It has been demonstrated that in the field of constructive interference,components of particle velocity field and acoustic pressure are coherent.As a consequence the transfer of signal energy alog the axis of a shallow sea wave-guide is accomplished with plane wave.Physical objects are detected in the field of destructive interference,which,according to known deterministic signs,can be defined as local vortices of the intensity vector.A large-scale vorticity with acoustic intensity vector curl,components different from zero originates in the vicinity of local vortices.Regular particle displacements of local vortices have been detected against combined receiving device phase centre along the axis of a wave-guide.It has been demonstrated that the structure of vortices depends on signal/noise ratio.Local vortices and vorticity form vortex structure of vector acoustic field.Signalling tone with frequency of 88 ± 1 Hz from near-surface moving sound source was taken into consideration.Introduced results of full-scale experiment expand our concepts of real fundamental properties of shallow sea acoustic field and are to be considered in theoretical models.
Spatiotemporal vector and phase properties of interference field of low-frequency signalling tone between three local vortices in a real shallow sea wave-guide have been studied.It has been demonstrated that in the field of constructive interference,components of particle velocity field and acoustic pressure are coherent.As a consequence the transfer of signal energy alog the axis of a shallow sea wave-guide is accomplished with plane wave.Physical objects are detected in the field of destructive interference,which,according to known deterministic signs,can be defined as local vortices of the intensity vector.A large-scale vorticity with acoustic intensity vector curl,components different from zero originates in the vicinity of local vortices.Regular particle displacements of local vortices have been detected against combined receiving device phase centre along the axis of a wave-guide.It has been demonstrated that the structure of vortices depends on signal/noise ratio.Local vortices and vorticity form vortex structure of vector acoustic field.Signalling tone with frequency of 88 ± 1 Hz from near-surface moving sound source was taken into consideration.Introduced results of full-scale experiment expand our concepts of real fundamental properties of shallow sea acoustic field and are to be considered in theoretical models.
引文
[1] Zhuravlev V A,Kobozev I K,Kravtsov Yu A.Dislocation phase front in oceanic wave-guide and their expression in acoustic measurements.Acoust.Phys.,1989;35(2):260-265
[2] Zhuravlev V A,Kobozev I K,Kravtsov Yu A.Energy flows in the vicinity of dislocations phase front wave field.J.Exp.Theor.Phys.,1993;104(5):3769-3783
[3] Eliseevnin V A,Tuzhilkin Yu I.Acoustic power flux in a wateguide.Acoust.Phys.,2001;47(6):688-694
[4] Shchurov V A,Kuleshov V P,Tkachenko E S.Interference phase spectra of wideband surface source in the shallow sea.Proceedings of the 22nd Session of Russian Acoustical Society,GEOS,Moscow,2010;2:248-251
[5] Shchurov V A,Kuleshov V P,Cherkasov A V.Vortex properties of the acoustic intensity vector in a shallow sea.Acoust.Phys.,2011;57(6):851-856
[6] Shchurov V.Comparison of the vorticity of acoustic intensity vector at 23 Hz and 110 Hz frequencies in the shallow sea.Appl.Phys.Res.,2011;3(2):179-189
[7] Shchurov V A,Lyashkov A S.On some peculiarities of the energy characteristics of the interference acoustic field in a shallow sea.Acoust.Phys.,2013;59(4):406-415
[8] Dall'Osto D R.Properties of the acoustic vector field in underwater waveguides.Doctoral dissertation,University of Washington,2013
[9] Shchurov V A.Large-and small-scale acoustic vortices intensities assessment.Proceedings of Meetings on Acoustics,2015;24:070012
[10] Nye J F,Berry M V.Dislocations in wave trains.Proc.R.Soc.London,Ser.A,1974;336(1605):165-190
[11] Baranova N B,Zel'dovich B Ya.Dislocation surfaces wave front and zeros the amplitude.J.Exp.Theor.Phys.,1981;80(5):1789-1797
[12] Shchurov V A.Vector acoustics of the ocean.Vladivostok,Dalnauka,2006:296
[13] Schurov V A,Cherkasov A V,Kasatkin B A et al.Anomalous features of the intensity vector field structure in acoustic waveguides.Underwater Investigation and Robotics,2012;2(12):4-17
[14] D'Spain G L,Williams D P,Kuperman W F.Energetics of dislocations in ocean acoustic fields.J.Acoust.Soc.Am.,2000;108(5):Abstract.p.2543
[15] D'Spain G L,Williams D P,Rovner G et al.Energy flow in interference fields.Ocean Acoustic Interference Phenomena and Signal Processing,2002:171-203
[16] Mann J A,Tichy J,Romano A J.Instantaneous and time-averaged energy transfer in acoustics fields.J.Acoust.Soc.Am.,1987;82(4):17-30
[17] Urick R J.Principles of underwater sound.McGraw-Hill,1975
[18] Frisk G.Ocean and seabed acoustics:A theory of wave propagation.Prentice-Hall,1994
[2] Zhuravlev V A,Kobozev I K,Kravtsov Yu A.Energy flows in the vicinity of dislocations phase front wave field.J.Exp.Theor.Phys.,1993;104(5):3769-3783
[3] Eliseevnin V A,Tuzhilkin Yu I.Acoustic power flux in a wateguide.Acoust.Phys.,2001;47(6):688-694
[4] Shchurov V A,Kuleshov V P,Tkachenko E S.Interference phase spectra of wideband surface source in the shallow sea.Proceedings of the 22nd Session of Russian Acoustical Society,GEOS,Moscow,2010;2:248-251
[5] Shchurov V A,Kuleshov V P,Cherkasov A V.Vortex properties of the acoustic intensity vector in a shallow sea.Acoust.Phys.,2011;57(6):851-856
[6] Shchurov V.Comparison of the vorticity of acoustic intensity vector at 23 Hz and 110 Hz frequencies in the shallow sea.Appl.Phys.Res.,2011;3(2):179-189
[7] Shchurov V A,Lyashkov A S.On some peculiarities of the energy characteristics of the interference acoustic field in a shallow sea.Acoust.Phys.,2013;59(4):406-415
[8] Dall'Osto D R.Properties of the acoustic vector field in underwater waveguides.Doctoral dissertation,University of Washington,2013
[9] Shchurov V A.Large-and small-scale acoustic vortices intensities assessment.Proceedings of Meetings on Acoustics,2015;24:070012
[10] Nye J F,Berry M V.Dislocations in wave trains.Proc.R.Soc.London,Ser.A,1974;336(1605):165-190
[11] Baranova N B,Zel'dovich B Ya.Dislocation surfaces wave front and zeros the amplitude.J.Exp.Theor.Phys.,1981;80(5):1789-1797
[12] Shchurov V A.Vector acoustics of the ocean.Vladivostok,Dalnauka,2006:296
[13] Schurov V A,Cherkasov A V,Kasatkin B A et al.Anomalous features of the intensity vector field structure in acoustic waveguides.Underwater Investigation and Robotics,2012;2(12):4-17
[14] D'Spain G L,Williams D P,Kuperman W F.Energetics of dislocations in ocean acoustic fields.J.Acoust.Soc.Am.,2000;108(5):Abstract.p.2543
[15] D'Spain G L,Williams D P,Rovner G et al.Energy flow in interference fields.Ocean Acoustic Interference Phenomena and Signal Processing,2002:171-203
[16] Mann J A,Tichy J,Romano A J.Instantaneous and time-averaged energy transfer in acoustics fields.J.Acoust.Soc.Am.,1987;82(4):17-30
[17] Urick R J.Principles of underwater sound.McGraw-Hill,1975
[18] Frisk G.Ocean and seabed acoustics:A theory of wave propagation.Prentice-Hall,1994