Analysis of hydrodynamic pressure fields of motorboats and pontoons in shallow water

• Autorzy: Bielański J.
• Języki publikacji: EN

Abstrakty

EN

The article presents the results of calculations of the pressure fields generated by a motorboat at the bottom of a shallow sea. Calculations were made using the boundary elements method (BEM), arranged on the surface of the boat and the bottom of the sea. This method is described in [3], and applied on a free surface linearized boundary condition. Results for four different lengths of motorboats, from 2.85 m to 9.5 m, sea depth from 1 m to 10 m, are presented in the form of a surface, approximated by a polynomial function whose coefficients are given. These functional relations allow one to calculate the maximum and minimum hydrodynamic pressure generated by the motor boat length, in the range as above, and the sea depth to about 10 m when flying at speeds of up to 20 m / s. Given functional dependencies can be used, in the field of security and anti-terrorism defences, and can serve to identify the type and size of speedboats, up to about 10 meters and a displacement of about 8 tons.

Słowa kluczowe

EN

hydrodynamic pressure field around speedboats; pressure signature; boundary element method

• Wydawca: Polskie Towarzystwo Akustyczne. Oddział Gdański
• Czasopismo: Hydroacoustics
• Rocznik: 2016
• Tom: Vol. 19
• Strony: 9--16
• Opis fizyczny: Bibliogr. 9 poz., rys., tab.

Twórcy

autor

Bielański J.

• Gdansk University of Technology Faculty of Ocean Engineering and Ship Technology Narutowicza 11/12, 80-233 Gdansk

Bibliografia

• [1] K.J. Bai, R.W. Yeng, Numerical Solution to Free-Surface Flow Problems. 10 th Symposium on Naval Hydrodynamics.
• [2] J. Bielański, Analysis of the hydrodynamic pressure and velocity field flowing around the ship, Scientific and Research Work W.O.i O. PG No. 47/11/PB, Gdańsk 2011, ( in Polish).
• [3] J. Bielański, Hydrodynamic Pressure Field of a Ship in Shallow Water, Library Acoustics and Ultrasound, Publisher IPPT Polish Academy of Sciences, Warsaw 2013.
• [4] R. Canale, S. Chapra, Numerical Methods for Engineers: with Software and Programming Applications, McGraw-Hill, New York, 2002.
• [5] G. Forsythe, M. Malcolm, C. Moler, Computer Methods for Mathematical Computations, Prentice Hall, Englewood Cliffs, 1977.
• [6] E. Kozaczka, The results of measurements of the pressure field. Internal Materials Naval Academy, Gdynia, (in Polish).
• [7] M. Krężelewski, General and Marine Hydrodynamics. T II, Technical University of Gdańsk, 1982, (in Polish).
• [8] S.S. Rao, The Finite Element Method in Engineering, 3rd ed., Butterworth Heinemann, Boston, 1999.
• [9] O.C. Zienkiewicz, R. L. Taylor, The Finite Element Method, 4th ed., Vol. 1, McGrawHill, London, 1989.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017)