Vol. 7, No 1, 2009 pp. 45 - 60
DOI 10.2298/FUPCT0901045V
UDC 534.87

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VIBRATION OF THE VESSEL AND BISPECTRUM OF HYDROACOUSTIC NOISE
Miodrag Vračar¹, Nenad Kovačević^2
1Military Technical Institute, Ratka Resanovića 111030 Belgrade, Serbia
²University Crenfield, College Road, Cranfield, England

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Abstract. The origin of vessels vibrations is dominantly determined by vessels propulsion system, auxiliary systems, pumps, breaking of the waves at the ship hull, etc. All of these systems contribute to the appearance of the underwater sound in water environment. As a source of underwater sound, vessels has the characteristic of directivity. Vibration of the vessel's structure is analyzed using spectra, but hydroacoustic signals are analyzed using spectra and higher order spectral analysis - bispectra. The measuring of the radiated hydroacoustic noise was done simultaneously with multi channel measurements of the vessels vibrations at few characteristics positions of the vessel.
Key words:  hydroacoustic noise of the vessel, vibrations, spectrum, bispectrum

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VIBRACIJE PLOVNOG OBJEKTA I BISPEKTAR HIDROAKUSTČKOG ŠUMA Vibracije plovnog objekata prouzrokuju, pre svega, njegov propulzioni sistemi, pomoćni sistemi, pumpe, udari talasa o trup i dr. Svi ovi sistemi doprinose pojavi podvodnog šuma u vodenoj sredini. Kao izvor podvodnog šuma, plovni objekat poseduje karakterističnu usmerenost. Vibracije strukture plovnog objekta su analizirane pomoću spektara, ali hidroakustički signali su analizirani pomoću spektara višeg reda – bispektara. Merenja izračenog hidroakustičkog šuma su izvršena istovremeno sa višekanalnim merenjima brodskih vibracija u nekoliko karakterističnih položaja.