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1
Content available The old and new procedures for the investigation of underwater signatures
Gloza I., Malinowski S. J., Marchalewski B., Dobrzeniecki J.
Hydroacoustics
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2011
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Vol. 14
55-60
EN
This paper presents the results of old and new techniques for the investigations of underwater acoustic fields radiated by different objects. In the Navy Test and Evaluation Ranges (NTER), we monitor the ship radiated underwater noise, pressure and other signatures. They are of major importance to sea mines, surface ships and submarines. The NTERs contain an accurate measurement system consisting of a bottom-mounted hydrophone array, which is used for different running vessels. We also have a special laboratory ship and a transportable multisensor module, which is the most recent Polish Naval Academy product. Nowadays, the problem of protecting the civilian and military harbor facilities is becoming more and more important. There is always a threat to the ports from submarines and terrorists who dive under the water.
2
Content available Identification of ship’s main noises in the hydroacoustics field
Domagalski J., Dobrzeniecki J.
Hydroacoustics
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2010
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Vol. 13
61-66
EN
Paper presents the results of the structure of the hydroacoustics field of different classes’ vessels measurements. Characteristics of underwater noises were described in the form of spectrograms and graphs worked out for different ship’s speeds. These results are representative for hydroacoustic measurements carried out in the shallow sea.
3
Content available Emission of hydroacoustics noise of ships with adjustment propeller
Domagalski J., Dobrzeniecki J.
Hydroacoustics
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2009
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Vol. 12
39-44
EN
In the present is furnished results of research of underwater emissions of disturbances in work by ship with adjustable propellers. Verification of level of noise emission was purpose of research dispose by shipping propellers depending on their. Noise have been presented from shipping propellers in background of noise from driving matches dating.
4
Content available Acoustic method of valuation of ships' drive mechanism operation
Domagalski J., Dobrzeniecki J.
Hydroacoustics
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2008
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Vol. 11
79-86
EN
The paper is presented the method of valuation of ships drive mechanism operation by comparison of noise level in ship's rooms, vibrations in selected places of drive fastening and acoustic disturbances generated by a ship to water environment. Selected researches results are presented in form of graphs.
5
Content available The method of determination of the acoustic characteristics of the ship
Dobrzeniecki J., Domagalski J.
Hydroacoustics
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2007
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Vol. 10
25-32
EN
The results of the research on the structure of the emission of the noise that are generated by the ship into the water environment are presented in this paper. The results are representative for the measurements that are carried out in the shallow water and presented in spectrograms and diagrams.
6
Content available Setting time periods of the concentration of the acoustic energy generated to water by ships
Dobrzeniecki J., Domagalski J.
Hydroacoustics
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2006
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Vol. 9
39-46
EN
Generating the acoustic energy into the water environmental through the hull of the ship and the ship propeller usually remains in the frequency from the range of single hertz to a few or several kilohertz. In the range of the frequency that was analyzed there are discrete components that are connected with the work of ship’s mechanisms as well as with broadband “noise” that is relevant to phenomenon of cavitation that in some range of work of ship’s propeller can mask discrete components connected for example with the work of the main engine. Fixing the ranges of frequencies in which the acoustic energy from ship’s equipment are concentrated, can facilitate the remote diagnostics of the ship as well as its identification.
7
Struktura pola akustycznego szumów podwodnych jednostki pływającej w polu bliskim
Gloza I., Dobrzeniecki J., Domagalski J.
Prace Naukowe Instytutu Telekomunikacji i Akustyki Politechniki Wrocławskiej. Konferencje
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2001
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Vol. 83, nr 27
269-274
EN
Investigations of acoustical field structure of the underwater ship noise in the near field are presented in the paper. These investigations were done for the purpose ship classification.
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