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    Wyświetlanie 1-12 z 12
    Tytuł:
    Badanie struktury dna Zatoki Gdańskiej metodą akustyki nieliniowej
    Investigation of structure of bay of Gdańsk bottom with non-linear acoustic method
    Autorzy:
    Kozaczka, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/222066.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
    Tematy:
    dno morskie
    echosonda parametryczna
    osady denne
    akustyka nieliniowa
    struktura warstwowa
    odwierty
    fala sondująca
    sea bottom
    parametric echo so under
    bottom sediment
    nonlinear acoustics
    layered structure
    boreholes
    sounding wave
    Opis:
    W pracy przedstawiono wyniki badań doświadczalnych i symulacyjnych, których celem jest wyznaczenie parametrów warstwowej struktury dna morskiego. W badaniach empirycznych zastosowano nieinwazyjną metodę sondowania wykorzystującą echosondę parametryczną SES-2000 Standard. Badania te przeprowadzono na akwenie Zatoki Gdańskiej. Wyniki sondowania porównano z danymi otrzymanymi z analizy odwiertów dokonanych przez wyspecjalizowane instytucje. Zwrócono uwagę na czynniki decydujące o dokładności pomiarów, a w szczególności na różne prędkości rozchodzenia się fali sondującej w zależności od rodzaju osadów dennych. Otrzymane wyniki są wstępem do opracowania pełnej procedury badania górnej warstwy dna morskiego wykorzystującej metody akustyki nieliniowej.
    The paper presents the results of experimental and simulation investigations, whose aim are to determine parameters of the sea bottom layered structure. The non-invasive sounding method employing SES-2000 parametric echo sounder was used to conduct empirical investigation. The investigations were conducted in the bay of Gdańsk. The results of the sounding were compared with the data obtained from the analyses of bore-holes made by specialized firms. Attention was paid to the factors responsible for the accuracy of measurement, especially to different speed values of propagation of the sounding wave dependent on the kind of bottom sediments.
    Źródło:
    Zeszyty Naukowe Akademii Marynarki Wojennej; 2012, R. 53 nr 1 (188), 1 (188); 97-106
    0860-889X
    Pojawia się w:
    Zeszyty Naukowe Akademii Marynarki Wojennej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New methods of underwater ship noise classification
    Autorzy:
    Kozaczka, E.
    Kozaczka, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/332374.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The detection, classification, identification and recognition ships noise features have been of the highest importance for scientific and also defense interest. A big effort is made in the passive sonar technologies that allow applying underwater noise for practical purpose. Results are presented which demonstrate the ability of the network to classify man made sources as are underwater ships noise. The paper presents a method based mainly on neural network that is very helpful for classification of these types of sources on the way to recognizing them.
    Źródło:
    Hydroacoustics; 2006, 9; 85-88
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Images of the Seabed of the Gulf of Gdańsk Obtained by Means of the Parametric Sonar
    Autorzy:
    Kozaczka, E.
    Grelowska, G.
    Kozaczka, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537471.pdf
    Data publikacji:
    2010-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.30.Ma
    43.50.Pc
    43.25.Jh
    Opis:
    The main goal of this paper is to present results of the experimental investigation of the seabed by means of parametric echosounder in the form of chosen images. The phenomena of nonlinear interaction between two parallel beams of high intensity gives as a results very narrow beam of low frequency wave, that enables to penetrate the sea bottom. The first step of our investigations was calibration of all the elements of the measuring system. In the second step the marine trials were carried out. For this purpose the mobile measuring set up was installed on the board of sailing boat. The details about the measuring devices can be found below. The main goal of these investigations was to determine the structure of the seabed for different places of the Gulf of Gdańsk. The special features of parametric generation of sound beam allow to penetrate the bottom for more then several meters. At the end of the paper, a set of images that illustrated the results of investigations has been presented.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 1; 91-94
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some methods of the sea bottom recognition
    Autorzy:
    Grelowska, G.
    Kozaczka, S.
    Szymczak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/332558.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    sea bottom recognition
    Gdansk Gulf region
    sonar
    Opis:
    Sea bottom structure recognition nowadays is a matter of great interest due to huge spectrum of potential applications, such as a hydrography, military oceanography, marine geosciences, offshore industry, environmental protection and many others. For that reason a great variety of tools and techniques for sea bottom measurements and modeling is developed. However, each technique leads to specific bottom images and allows to determine only few characteristics of examined area. In the paper are presented experimental results collected in the Gdansk Gulf region obtained by means of three technique: wide side sonar, parametric sonar and multi-beam sonar.
    Źródło:
    Hydroacoustics; 2009, 12; 69-76
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diver Observations by Means of Acoustic Methods
    Autorzy:
    Kozaczka, E.
    Grelowska, G.
    Kozaczka, S.
    Szymczak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400100.pdf
    Data publikacji:
    2013-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.30.Vh
    43.30.Wi
    43.66.Qp
    Opis:
    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 effective 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).
    Źródło:
    Acta Physica Polonica A; 2013, 123, 6; 1098-1100
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Examination of the Upper Layers of the Seabed by the Means of the Acoustic Methods
    Autorzy:
    Kozaczka, E.
    Grelowska, G.
    Szymczak, W.
    Kozaczka, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1504447.pdf
    Data publikacji:
    2011-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.30.Ma
    43.30.Pc
    43.25.Jh
    Opis:
    Propagation of acoustic waves in the sea, in particular in shallow sea, depends on several factors. The basic of them are source power and frequency of acoustic waves, spatial distribution inhomogeneous medium in which acoustic wave propagates, and distributions of speed of sound and density of seawater. The coastal conditions, which limit water medium from above (free surface of the sea) and from bottom (the seabed), are no less important. In this paper we will consider the examination of the layer structure of the seabed by the means of the acoustic methods. By the notion of acoustic methods we mean use of phenomena in the field of nonlinear hydroacoustics. Based on this, the parametric sonar was constructed and was used to the seabed sounding. This parametric sonar is commonly called sub-bottom profiler. The selected results of extensive experimental research, that have been performed in waters of the Gulf of Gdańsk in the years 2008-2010, will be presented in this work.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 6A; 1091-1094
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gdansk Bay sea bed sounding and classification of its results
    Autorzy:
    Grelowska, G.
    Kozaczka, E.
    Kozaczka, S.
    Szymczak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/258594.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    sea bed sounding
    parametric sub-bottom profiler
    sea bed structure
    Opis:
    The main goal of this paper is to describe the results of sounding the Gdansk Bay sea bed by using a SES- 2000 Standard parametric sub-bottom profiler. Quality of data obtained during trials depends inter alia on a proper location of transducer array to reduce influence of pitch, roll and heave motions as well as ship self noise (resulting from bubbles due to propeller and flow around hull, vibration generated by main engine and auxiliary devices). Furthermore, calibration of complementary units such as GPS, heading sensor, MRU-Z motion sensor and navigation devices make sea-bed investigating system capable of working with its whole capability. Results of so prepared surveys have been presented and discussed. They contain also an elaborated map of Gdansk Bay with preliminarily classified sea-bed materials and description of most interesting areas.
    Źródło:
    Polish Maritime Research; 2013, 3; 45-50
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Processing data on sea bottom structure obtained by means of the parametric sounding
    Autorzy:
    Kozaczka, E.
    Grelowska, G.
    Kozaczka, S.
    Szymczak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/259876.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    sea bottom acoustic
    sub-bottom profiler
    sea bed structure
    Opis:
    The aim of the paper is to analyze data obtained during sounding the Gdansk Bay sea bed by means of the parametric echo-sounder. The accuracy of the sea bottom structure investigation needs correct configuration of research equipment and proper calibration of peripheral devices (GPS, heading sensor, MRU-Z motion sensor and navigation instruments which provide necessary data to bathymetrical measurement system, enabling its work with full capability. The parametric sub-bottom profiler delivers two types of data which include different information: envelope and pure echo signal sampled without processing. The first is used to present echograms in real time and the second one is stored during sounding and the obtained data can be analyzed by using post-processing software. Differences in the results are presented and discussed. And, are described also criteria taken into account during determination of the measurement areas and selection of different configurations of the software according to the information to be obtained from trials. Complementary information can be achieved from processing the data by means of the procedures offered by Matlab software, which allows for a clear 3D presentation of the results. The consideration are illustrated by echograms taken in the natural conditions.
    Źródło:
    Polish Maritime Research; 2012, 4; 3-10
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detection of Objects Buried in the Sea Bottom with the Use of Parametric Echosounder
    Autorzy:
    Kozaczka, E.
    Grelowska, G.
    Kozaczka, S.
    Szymczak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/177224.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sea bottom
    sea bottom acoustic
    buried objects
    Opis:
    The paper contains results of a in situ research main task of which was to detect objects buried, partially or completely, in the sea bottom. Object detecting technologies employing acoustic wave sources based on nonlinear interaction of elastic waves require application of parametric sound sources. Detection of objects buried in the sea bottom with the use of classic hydroacoustic devices such as the sidescan sonar or multibeam echosounder proves ineffective. Wave frequencies used in such devices are generally larger than tens of kHz. This results in the fact that almost the whole acoustic energy is reflected from the bottom. On the other hand, parametric echosounders radiate waves with low frequency and narrow beam patterns which ensure high spatial resolution and allows to penetrate the sea bottom to depths of the order of tens of meters. This allows to detect objects that can be interesting, among other things, from archaeological or military point of view.
    Źródło:
    Archives of Acoustics; 2013, 38, 1; 99-104
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Underwater Noise Generated by a Small Ship in the Shallow Sea
    Autorzy:
    Grelowska, G.
    Kozaczka, E.
    Kozaczka, S.
    Szymczak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/177360.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    signal processing
    sound propagation
    underwater ship noise
    propagation in the shallow sea
    Opis:
    Study of the sea noise has been a subject of interest for many years. The first works in this scope were published at the turn of the twentieth century by Knudsen (Knudsen et al., 1948) and G. Wenz (Wenz, 1962). Disturbances called “shipping noise” are one of the important components of the sea noise. In this work the results of an experimental research of underwater noise produced by a small ship of a classic propulsion are presented. A linear receiving antenna composed of two orthogonal components was used in the investigation. Identification of the main sources of acoustic waves related with the ship was achieved. In addition, the intensity of the wave was measured. The research was performed in conditions of the shallow sea.
    Źródło:
    Archives of Acoustics; 2013, 38, 3; 351-356
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Transmit and Receive Characteristics of Laboratory Model for the Parametric Echosounder
    Autorzy:
    Grelowska, G.
    Kozaczka, E.
    Nowicki, A.
    Kozaczka, S.
    Szymczak, W.
    Tymkiewicz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400099.pdf
    Data publikacji:
    2013-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.30.Ma
    43.30.Pc
    43.25.Jh
    Opis:
    Investigation and operation of devices based on nonlinear interaction of high-intensity waves have been carried out for several decades. However, it is still a new tool to study the properties of the water environment and especially the upper layers of the seabed. This paper describes the results of tests of the new device that is intended to be applied for sounding underwater areas. The device has been designed and built in collaboration with the Department of Ultrasound of the Institute of Fundamental Scientific Researches of the Polish Academy of Sciences in Warsaw.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 6; 1094-1097
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical investigation ot the finite amplitude wave pressure distribution radiated by a circular transducer
    Autorzy:
    Dobrociński, S.
    Kozaczka, E.
    Grelowska, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/331684.pdf
    Data publikacji:
    1997
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The paper presents the results of numerical investigations of the circular transducer's nearfield. The investigations were carried out applying the numerical solution (FEM) of the nonlinear acoustics equation. It was assumed that the transducer generated harmonic vibrations. Different pressure distributions at the transducer's surface were taken to determine pressure distributions in its nearfield.
    Źródło:
    Hydroacoustics; 1997, 1; 71-74
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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