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    Wyświetlanie 1-13 z 13
    Tytuł:
    Critical Condition of Sewage Network
    Stan krytyczny sieci kanalizacyjnej
    Autorzy:
    Raganowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/386000.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    sieć kanalizacyjna
    stan krytyczny
    rozkład Weibulla
    metoda Monte Carlo
    sewage network
    critical state of sewerage network
    Weibull distribution
    Monte-Carlo simulation
    Opis:
    W artykule przedstawiono metodykę modelowania statystyczno-stochastycznego krytycznego stanu technicznego sieci kanalizacyjnej. Stan krytyczny badanego obiektu zdfiniowano jako przejście przewodów kanalizacyjnych od stanu konserwycji do stanu rehabilitacji technicznej. Badania modelowe obejmują kolektory betonowe DN 600/1100, DN 800/1200, DN 900/1350 mm, przewody kamionkowe DN 200–400 mm i przyłącza kamionkowe DN 100-200 mm. Modelowanie statystyczne oparto na rozkładzie Weibulla, a estymację jego parametrów na metodzie momentów. Natomiast modelowanie stochastyczne przeprowadzono na podstawie kombinacji rozkładu Weibulla z metodą Monte-Carlo. Ustalenie krytcznego stanu pozwala na szczegółową ocenę techniczną badanej sieci kanalizacyjnej.
    The paper presents the methodology formulated for determining the critical technical state of operating sewer pipes that is based on statistical-stochastic modeling. It describes the theoretical boundary between the area comprised of pipes that do not show any damage or require only maintenance measures and the area comprised of pipes that require renovation. The study includes concrete collectors with dimensions of DN 600/1100, 800/1200, and 900/1350 mm, stoneware pipes of with diameters ranging from DN 200 mm to 400 mm, and stoneware connections (DN 100–200 mm). The statistical modeling phase was carried out using Weibull distribution, and its parameters were evaluated by the method of moments. In contrast, the stochastic studies were based on a combination of the method of moments and Monte-Carlo mathematical simulations. On the basis of the proposed forecasting, it was possible to carry out a qualitative and quantitative analysis of the technical condition of the exploited sewage systems. Quantitative analysis helped us to determine the necessary range of renovation, which is an important operation component of every linear sewage network.
    Źródło:
    Geomatics and Environmental Engineering; 2018, 12, 1; 91-108
    1898-1135
    Pojawia się w:
    Geomatics and Environmental Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Symulacja sygnałów i zakłóceń hydrokustycznych w komputerowych trenażerach sonarów
    The hydroacoustic signal and noise generation in computer sonars training simulators
    Autorzy:
    Raganowicz, A.
    Kilian, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/332640.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    In training simulators of older sonars, made in analog technology, noise, reverberation and echo signals were generated and processed by complicated, analog circuits informs close to real signals. In simulators of new sonar's generation, with computer processing and displaying, the generation of dynamic sonar images, included full signal processing realized by real sonar, is possible directly by personal computer. In this paper some methods of echo signals, reverberations, and noise computer generation for made training simulator of ahead and side looking sonars are presented as well, as changes of sonar's settings simulation and some regards about construction of simulators and simple communication with computer "teacher's" station. Two examples of real and simulated displays (for ahead and side looking sonars) are shown.
    Źródło:
    Hydroacoustics; 2000, 3; 141-146
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic signal processing in passive sonar system with towed array
    Autorzy:
    Raganowicz, A.
    Rudnicki, M.
    Schmidt, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/331645.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    sonar system
    acoustic signal processing
    towed array
    Opis:
    The aim of this document is to introduce acoustic signal processing in passive sonar system with towed array. The concept of the "acoustic signals processing" includes all possible operations on analogue signals such as amplifying, filtering, sampling and most importantly - operations on digital signals obtained in the sampling process. Digital operations executed in the system include: synchronizing, conversion, sorting, creating deflected beams sets, plotting the power density spectrum received signals and imaging the results. Apart from digital signals processing, we focus on reciprocal connections between microcontrollers and processors in which processing is performed. At the end of this document some exemplary imagings of the output are presented, obtained at the marine testing of this system.
    Źródło:
    Hydroacoustics; 2008, 11; 329-338
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Special forms of echo visual representation in an ahead looking sonar
    Autorzy:
    Raganowicz, A.
    Kilian, L.
    Ostrowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/331664.pdf
    Data publikacji:
    2002
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The paper discusses ways to organise visual representation in a multi-beam ahead looking sonars whose function is to detect objects on the bottom and in pelagic zones. Forms of visual representation are shown and illustrated on the basic screen (panoramic representation and setting, alarms) and on the auxiliary screen (type A, B and special). Special forms of visual representation are mainly used in detecting objects in difficult hydrological conditions and when classifying objects. Several types of visual representations are shown, including a historical data example, multiplied type A representation in multiple beams and two types of quasi-spatial displays.
    Źródło:
    Hydroacoustics; 2002, 5; 47-52
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Principles of computing and displaying the results of detection by underwater systems as part of sound velocity measurements
    Autorzy:
    Raganowicz, A.
    Kilian, L.
    Salamon, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/331744.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    hydroacoustics
    underwater systems
    hydrolocation
    hydrocommunication systems
    Opis:
    The paper presents the upgraded system for measurements of sound velocity profiles and for computing and imaging the terms of detection in different hydrolocation and hydrocommunication systems. Three types of computations made by the system's processors are discussed. The most interesting task is to link the propagation routes and ray density with the parameters of the hydroacoustic system to obtain the desired display of the conditions to detect the signal from the background noises. Presented discussion of methodology of determining detection conditions using different forms of range equation gives a more detailed description of this task. In the next part of this paper the software's display function and necessary settings are specified and discussed. In the end two examples of computed detection conditions images (for active and passive sonar) are shown.
    Źródło:
    Hydroacoustics; 2003, 6; 267-274
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Visualisation forms in MCM side scan sonar
    Autorzy:
    Kilian, L.
    Raganowicz, A.
    Sidorko, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/331945.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The article discusses forms of visualisation on the monitors of an MCM side scan sonar with towbody modernised by the DMES. The introduction gives an overview of the structure of the sonar, how it collects signals and the nature of the signals. This forms the basis for how the signals are visualised. Next a description is given of other factors which determine the form of visualisation on the sonar’s monitors. They are the operator’s tasks and the display of the settings, the readings of additional sonar sensors, how the system cooperates with other onboard systems, operator training and ergonomics. Examples of visualisation are included.
    Źródło:
    Hydroacoustics; 2010, 13; 119-126
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Processing the complex signal in the acoustic processor of a sonobuoy system
    Autorzy:
    Raganowicz, A.
    Rudnicki, M.
    Salamon, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/332675.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The article presents digital methods for processing the complex signal in the acoustic processor of a sonobuoy. The overall system design and the complex signal are presented. Two alternative methods for signal processing are discussed: in the time domain and in the frequency domain. Block diagrams of the algorithms of both processing methods are included. The problems involved in the practical implementation of data analysis methods are discussed. The problems are produced by the phenomena occurring in the system’s analogue section and by the complexity of the computation related to how powerful the digital algorithms are. The computation errors in both methods are analysed. The advantages and disadvantages of the different signal processing methods are discussed, with emphasis on the practicality of the device. The advantage of the processing method in the frequency domain is explained. Graphic images of the results of both processing methods are included on the example of real signals received during the study.
    Źródło:
    Hydroacoustics; 2005, 8; 163-170
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Visual representation of the effects of spatial and frequency filters applied in passive sonars
    Autorzy:
    Raganowicz, A.
    Salamon, R.
    Rudnicki, M.
    Kilian, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/331957.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The operator of a passive sonar should be able to discern the direction (bearing) of a submerged, noise-producing object. Interference to bearing comes from reverberations, noise from the sea, man-made noise and noise generated by other objects. The article presents methods of spatial and frequency filtration designed to provide various forms of display of those fragments of the spectrum that are of interest to the operator. The operator makes his selection on the basis of many spectrograms that are produced during the successive listening cycles, displayed on the monitor. The amplitudes of spectral lines in the spectrograms are presented as lines of various lengths and colours. The summation spectrum of the displayed listening cycles is presented, too. The lines from a selected spectral range are shown on the panoramic amplitude graph in the function of the bearing angle. Thanks to that the determination of the location of the source of sound is significantly improved. The source of sound can also be discerned by using a reverse technique whereby a group of spectral lines is determined on the basis of a selected sector of angular observation.
    Źródło:
    Hydroacoustics; 2001, 4; 213-116
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimizing of target detection and tracking processes realized on consoles of passive sonar with linear towed antenna
    Autorzy:
    Raganowicz, A.
    Sadowski, K.
    Dolot, M.
    Kilian, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/332562.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    passive ASW sonar
    imaging
    detection
    tracking
    Opis:
    The long-range passive towed sonar was first modernised a few years ago. Building on operator experience over that period, a concept was developed of optimising the tasks performed by sonar operators, and improving forms of imaging to inform about object detection and support object tracking. The concept was implemented and successfully tested during ships’ manoeuvres. The optimisation of operator tasks was designed to keep listening for signals from an object separate from object tracking. Operator tasks have been made easier by rearranging the imaging, improving interaction between monitors, extending the navigation imagery module, adding new tools for building an acoustic database of potential targets; and improving the recording, browsing and playback of key recorded data. The article gives a more detailed account of the project and its results.
    Źródło:
    Hydroacoustics; 2016, 19; 329-334
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Signal processing in the hydroacoustic ships berthing aid system
    Autorzy:
    Marszal, J.
    Salamon, R.
    Kilian, L.
    Raganowicz, A.
    Szurowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/332707.pdf
    Data publikacji:
    1997
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The berthing of ships is an extremely complicated task that requires decisions on the movement of ships based on a large number of variabies: tide wind, visibility, speed, distance from jetty. Particular difficulties are related to the less maneuverable ships such as very large crude carriers. The presented hydroacoustic ships berthing aid system measures four distances of a ship to the jetty using the sonar echo method. The system computer calculates the bow and stern speed and distances to dolphins from the measured data. The results obtained are simultaneously presented on a large, high luminance display as well as printed out and recorded on computer discs. Additionally the dolphins displacements are measured and the data obtained together with its statistical parameters are recorded.
    Źródło:
    Hydroacoustics; 1997, 1; 237-242
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Workstation for training ASW helicopter navigators and analysing real flight data
    Autorzy:
    Raganowicz, A.
    Kilian, L.
    Marszal, J.
    Schmidt, A.
    Sidorko, T.
    Rudnicki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/332784.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    helicopter navigators
    real flight data
    aviation
    Opis:
    The article presents a training and diagnostic workstation designed for Polish Navy ASW helicopter navigators. Installed at the helicopter base, the workstation is used for training and instruction in operating the device and analysing information gathered by navigators during the flight using the ASW onboard sonar, sonobuoy receiver and magnetometer. The workstation allows instructors to task two operators and monitor their performance under conditions resembling those onboard a plane. The tasks involve the operation of the consoles and collecting information during tactical situations, diagnosing damage and analysing flight data in office environment. The objective is to ensure proper helicopter navigator training and experience given the limited possibility of training flights.
    Źródło:
    Hydroacoustics; 2009, 12; 181-188
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multibeam sonar with hexagonal array
    Autorzy:
    Salamon, R.
    Marszal, J.
    Kilian, L.
    Jedel, A.
    Ostrowski, Z.
    Raganowicz, A.
    Rudnicki, M.
    Wofan, Z.
    Zachariasz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/332250.pdf
    Data publikacji:
    1999
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The paper presents a multi-beam digital sonar that was designed for monitoring and fish stock assessment in in/and waters. The sonar can also be used as a bottom profiler in lakes, rivers and shallow sea areas. The hexagonal piezoelectric transducer array co-operates with a commutator set. The 32 -channel digital beamformer creates 30 narrow receiving beams in every 60o sector of simultaneous observation. The six sectors cover the whole 360o angle range of the sonar. The beamformer digital signal processing is based on second order sampling of echo signals and the phase-shifting principle of beam deflection. The sonar block diagram, beamformer algorithms, as well as transducers designs are discussed.
    Źródło:
    Hydroacoustics; 1999, 2; 133-138
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modernization of ASW sonar SQS-56 at Gdansk University of Technology
    Autorzy:
    Marszal, J.
    Schmidt, J.
    Salamon, R.
    Kilian, L.
    Raganowicz, A.
    Zachariasz, K.
    Ostrowski, Z.
    Jedel, A.
    Rudnicki, M.
    Sidorko, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/331991.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The fast development of electronic technology and digital signal processing methods makes electronic devices, including sonar systems ones, obsolete very quickly. On the other hand the ships mechanical components including mechanical parts of sonars are operational for a few dozens of years. It makes good opportunity to modernize these devices by using modern electronic devices and new digital signal processing methods with application of existing antenna and mechanical systems. The paper presents the modernization of ASW sonar SQS-56 on the Polish frigate ORP “Kościusko”. The aim of modernization, the new parameters of the sonar and block diagram after modernization are presented.
    Źródło:
    Hydroacoustics; 2010, 13; 191-196
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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