Main Article Content
Abstract: - The paper considers the case of wave pocket propagation in a dual-frequency signal form in the shallow sea. The shallow sea is represented by a flat regular waveguide with combined boundaries. As the result of solving the case to determine the energy characteristics of the acoustic field, the basic analytical expressions for estimating the wave packet signal propagation velocity of the indicated type are obtained on the basis of the energy interpretation of the group velocity. The wave packet propagation velocity is described using frequency and coordinate dependencies of the dual-frequency signal velocity, as well as the concurrent observed time-average power stream density and acoustic energy density. The aim of the paper is to determine the peculiarities of the wave packet propagation velocity and main energy characteristics of the acoustic field in the plane regular waveguide with combined boundaries representing the shallow sea. The field is formed by a fixed source.
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Journal author rights
In order for Romanian Journal of Acoustics and Vibration to publish and disseminate research articles, we need publishing rights. This is determined by a publishing agreement between the author and Romanian Journal of Acoustics and Vibration. This agreement deals with the transfer or license of the copyright to Romanian Journal of Acoustics and Vibration and authors retain significant rights to use and share their own published articles. Romanian Journal of Acoustics and Vibration supports the need for authors to share, disseminate and maximize the impact of their research and these rights, in Romanian Journal of Acoustics and Vibration proprietary are defined below:
For subscription articles:
Authors transfer copyright to the publisher as part of a journal publishing agreement, but have the right to: Share their article for personal use (manuscript version); retain patent, trademark and other intellectual property rights (including research data); proper attribution and credit for the published work.
For open access articles:
Authors sign an exclusive license agreement, where authors have copyright but license exclusive rights in their article to the publisher. In this case authors have the right to: share their article in the same ways permitted to third parties under the relevant user license; retain patent, trademark and other intellectual property rights (including research data); proper attribution and credit for the published work.
Rights granted to Romanian Journal of Acoustics and Vibration
For both subscription and open access articles, published in proprietary titles, Romanian Journal of Acoustics and Vibration is granted the following rights:
- The exclusive right to publish and distribute an article, and to grant rights to others, including for commercial purposes;
- For open access articles, Romanian Journal of Acoustics and Vibration will apply the relevant third party user licence (Open access licencses) where Romanian Journal of Acoustics and Vibration publishes the article on its online platforms;
- The right to provide the article in all forms and media so the article can be used on the latest technology even after publication;
- The authority to enforce the rights in the article, on behalf of an author, against third parties, for example in the case of plagiarism or copyright infringement.
 L. Brillouin. Wave propagation and group velocity. New York. L.: Acad. Press. 1960. 154 p.
 J.W. Strett (Lord Relley.). Theory of sound. Vol.1. INTL 1955, 504 p.
 A. Sommerfeld Ein Einwand gegen die Relativtheori der Elektrodynamik und seine. Beseitigung Physikalische Zeitschrift 8:841. 1907. GS: II, pp. 183-184.
 Isakovich M. A. General Acoustics. Nauka. 495 p.
 Vainshtaine L.A. Electromagnet Waves. Radio i svias. 1988. 440 p..
 Kopeikin V.V. Refraction of waves in linear media with frequency dispersion. Nauka 200. 142 p..
 Vovk I.V., Grinchenko V.T., Matsypura V.T. Basics of acoustics. Naukova dumka, 2009. 867 p.
 Waveguide Theory.Hand book . Meleshko V.V.Matsipura V.T., Ulitko I.A.: VD KDU.2013. 415 p.
 Gorelik G. Оscillations and waves. GI FML 1959. 572 p.
 Bulanaya M.A., Vovk I.V., Grinchenko, V.T. Matsypura V.T. Peculiarities of the sound pulse propagation in the planar regular waveguide, Acoustics Bulletin, (11), pp. 9-23
 Gladkih M.D., Korzhyk O.V. Didkovsky V.S. Bezruchko A.O. On the Deformation of a Different- Frequency Pulse Code Signal in an Underwater Sound Channel // Systemi obrobky iformaciy 2015. № 10.pp. 12 – 15.
 Gladkih M.D.,Korzhyk O.V. DidkovskyV.S. Propagation
of a sound pulse information message in a plane- parallel waveguide with ideal boundaries /Electronics and comunikation.Vol. 21, № 3 (92), 2016 pp. 82-96.
 Schurov V.A., Kuznetsov V.P., Cherkasov V.P. Vortex
properties of intensity in shallow sea /Akustichesky zhurnal, 2011, Т.57, № 6, pp. 837- 843.
 Lastovenko V.A., Lisutin V.A. Features of vector acoustic fields in a wave waters of the shallow sea //Zbirnik naukovih prac. Prykladna fisika I matematika, SNUIA, 2014. pp. 192 –198.
 Yaroshenko V.O., Chaika O.C., Korzhyk O.V. Singular points of vector intensity’s Field in the guide with combine Boundaries//Mikrosyst. Electron. Acoust.2018., Vol.23, № 1,pp. 44-54.
 Dall Osto DR, Dahl PH, Choi JW, Property of the acoustic intensity field in a shallow water waveguide. / J. Acoust. Soc. Am. 2012. Mar.131(13),-2023-35, doi:10.112/1.3682063, PMD 2242 3699.