Vibration and radiated noise of a small ship

• Autorzy: Gloza I.
• Języki publikacji: EN

Abstrakty

EN

Extensive measurements "in situ" both of the sound intensity and the vibration were made of M25, a small ship (length 8 m , beam 4 m, displacement 2 tons) powered by 20 kW a direct-drive low-speed diesel engine. A small ship creates a series of harmonics which amplitudes and frequencies are connected with ship speed. The underwater sound measurement was performed for anchored condition. In this paper, two different methods of measurement were used, which provide complementary information. A static method to measure noise from an anchored ship was used when only the main engine was running. In addition to the radiated noise measurements, vibration measurements were conducted aboard this ship. The coherence function was performed to associate each component of underwater noise with the vibrating part of the engine which generates it. The calculation of the sound intensity was made to locate the main source of noise on board. Underwater noise from small ships elevates the natural ambient by 10 - 20 dB in many area; the effects of this noise on the biological environment have been rarely reported.

Słowa kluczowe

EN

vibration; noise; small ship

• Wydawca: Polskie Towarzystwo Akustyczne. Oddział Gdański
• Czasopismo: Hydroacoustics
• Rocznik: 2008
• Tom: Vol. 11
• Strony: 87--96
• Opis fizyczny: Bibliogr. 7 poz., rys., wykr.

Twórcy

autor

Gloza I.

• Polish Naval Academy, Śmidowicza, 81 - 919 Gdynia, Poland,

Bibliografia

• 1. D. Ross, Mechanics of Underwater Noise, Pergamon, and New York 1976.
• 2. E. Kozaczka, Underwater ship noise. Symposium on Hydroacoustics, Gdańsk-Jurata 2000.
• 3. S. J. Malinowski, I. Gloza, Underwater Nosie Characteristics of Small Chips, Acta Acoustica united with Acoustica, Vol. 88 (2002),
• 4. F. Cervera, H. Estellees, F. Galvez, F. Belmar, Sound intensity in the near field above a vibrating flat plate. “Noise Control Engineering Journal” 45 (1997), 193-199
• 5. P.T. Arveson, D. T. Vendittis, Radiated noise characteristics of a modern cargo ship. J. Acoust. Soc. Am., 107 (1), 118-129, 2000.
• 6. R. J. Urick, Principles of Underwater Sound, Mc Graw-Hill, New York 1975. Chap.10.
• 7. Finn Jacobsen, Sound Intensity , XLVII Otwarte Seminarium z Akustyki OSA’2000.