Investigation of the underwater noise produced by ships by means of intensity method

Kozaczka, Eugeniusz; Domagalski, J.; Gloza, I.

doi:10.2478/v10012-010-0025-0

Cited by 6 publications

(7 citation statements)

References 3 publications

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“…In view of the limitations imposed on the application of the measurement method in question [8,9], the frequency band for processing the measurement results was limited from 6.9 Hz to 1 334 Hz. The accuracy of determination of the level for the frequency of 6.9 Hz should not exceed ±3 dB, and for the upper frequency: ±1 dB.…”

Section: Results Of In Situ Investigationmentioning

confidence: 99%

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Shipping Low Frequency Noise and Its Propagation in Shallow Water

Kozaczka

Grelowska

2011

Acta Phys. Pol. A

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One of the most significant factor influencing acoustical climate of the sea is underwater noise generated by moving ships. If the considered sea area has features of the shallow water, namely the wave frequency fulfils relation f < 10c h , where c denotes phase speed of sound, and h is depths of the sea, then in certain distance from the wave source specific image of sound pressure distribution in the mean of wave modes appears. The modes constitute wave packet propagating with group speed in the direction parallel to the sea surface. The paper presents results of the experimental investigation concerning the distribution of the sound field created by moving ship in the shallow water, in a small distance from the ship. The main acoustical characteristics, describing features of the field are spectrograms in pseudo-3D system: distance and frequency in geometrical form, and sound intensity in the optical one (color). Results presented in such a way pointed individual features of the sound source known often as acoustical signature of the source (ship).

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Section: Results Of In Situ Investigationmentioning

confidence: 99%

“…One of the fundamental features, which differed the sound intensity measurement from the sound pressure one, is the possibility of determining the phase differences between active and passive part of the sound field [7][8][9], which allows to determine direction of propagation of acoustic waves in water.…”

Section: Results Of In Situ Investigationmentioning

confidence: 99%

Shipping Low Frequency Noise and Its Propagation in Shallow Water

Kozaczka

Grelowska

2011

Acta Phys. Pol. A

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“…The ship with the above mentioned settings of its propeller developed the speed of 6,8,12 [kn], respectively. The spectrograms achieved during the tests are presented in Fig.…”

Section: Tests Conducted Inmentioning

confidence: 99%

“…In the frame of the tests, a.o., measurements of underwater noise generated by ships are conducted both in stationary and dynamic trial areas. The results of identification of acoustic wave sources, obtained from the tests performed in a stationary trial area have been presented in the previous publication [7,8,9,10].…”

Section: Introductionmentioning

confidence: 99%

Identification of hydroacoustic wave sources of ship in motion

Kozaczka¹,

Domagalski²

2010

Polish Maritime Research

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This paper deals with results of identification tests of acoustic field spectrum of underwater noise generated by ship in motion. The field is connected with acoustic activity of ship mechanisms and devices in operation. Vibration energy generated by the mechanisms and devices is transferred through ship structural elements to surrounding water where it propagates in the form of acoustic waves of a broad band of frequencies. In the publication results of identification tests of underwater noise generated by a ship in motion, arepresented.

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“…Acoustic methods have been extensively used to locate and identify underwater objects [4]. These applications include locating ships and underwater vehicles [5 7], nding shipwrecks [8], imaging sediments [9] and imaging bubble elds.…”

Section: Introductionmentioning

confidence: 99%

Diver Observations by Means of Acoustic Methods

et al. 2013

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Searching for objects, especially small ones, moving under water near its the free surface, is always not an easy task. Designing tools for the detection of such targets is a real challenge when the possibility of a terrorist attack is a real threat. This paper presents some aspects of diver detection by means of acoustics methods, both active (side scan sonar) and passive ones (linear receiving antenna). This approach is quite e ective because divers can use both breathing apparatus operating in the closed-loop (so-called rebreathers), and popular open-circuit breathing (exhalation of used air or a breathing gas mixture into the water).

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Investigation of the underwater noise produced by ships by means of intensity method

Abstract: ABSTRACT

Cited by 6 publications

References 3 publications

Shipping Low Frequency Noise and Its Propagation in Shallow Water

Shipping Low Frequency Noise and Its Propagation in Shallow Water

Identification of hydroacoustic wave sources of ship in motion

Diver Observations by Means of Acoustic Methods

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