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Wyszukujesz frazę "Dymarski, P." wg kryterium: Autor

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    Wyświetlanie 1-15 z 15
    Tytuł:
    Numerical simulation of viscid flow around hydrofoil
    Autorzy:
    Dymarski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/259633.pdf
    Data publikacji:
    2006
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    lepki napływ dookoła wodolotu
    metoda ograniczona
    viscid flow around hydrofoil
    Spalart-Allmaras model
    finite volume method
    SOLAGA
    Opis:
    This paper presents results of application of a viscid fluid model to calculate flow around a finite-span hydrofoil. The presented calculations were performed with the use of SOLAGA software developed by this author. The used theoretical model of viscid liquid motion was described, consisted of averaged liquid motion equations and Spalart-Allmaras one-equation model of turbulence. Also, a numerical model based on the finite volume method was shortly presented. Calculation results were shown in the form of distribution diagrams of pressures, longitudinal component of velocity and longitudinal component of rotation velocity. Additionally, the presented characteristics of the lifting force coefficient and drag force coefficient were compared with experimental data.
    Źródło:
    Polish Maritime Research; 2006, 1; 8-14
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computational simulation of motion of a rescue module during its launching from ship at rough sea
    Autorzy:
    Dymarski, C.
    Dymarski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/259483.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    lifeboat
    rescue boat launch
    innovation
    launch ramp aft
    computational model for simulation lifeboat
    computational model for simulation
    Opis:
    This paper is a continuation of the work titled : “A computational model for simulation of motion of rescue module during its launching from stern ramp of a ship at rough sea”. It presents results of computer simulations of motion of a rescue module with embarked persons during its launching on rollers along stern ramp of a ship at rough sea. The simulations were conducted for a selected ship fitted with a launching ramp , for a few selected scenarios of sea conditions. It was assumed that during this operation the ship drifts across direction of wave propagation.
    Źródło:
    Polish Maritime Research; 2014, 3; 54-60
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Robust Audio Watermarks in Frequency Domain
    Autorzy:
    Dymarski, P.
    Markiewicz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/308461.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    annotation watermarking
    audio watermarking
    digital signature
    dirty paper codes
    LDPC
    Opis:
    In this paper an audio watermarking technique is presented, using log-spectrum, dirty paper codes and LDPC for watermark embedding. This technique may be used as a digital communication channel, transmitting data at about 40 b/s. It may be also applied for hiding a digital signature, e.g., for copyright protection purposes. Robustness of the watermarks against audio signal compression, resampling and transmitting through an acoustic channel is tested.
    Źródło:
    Journal of Telecommunications and Information Technology; 2014, 2; 12-21
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computational model for simulation of lifeboat motions during its launching from ship in rough seas
    Autorzy:
    Dymarski, P.
    Dymarski, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/259137.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ship in rough seas
    life saving appliances (LSA)
    lifeboat launching
    lifeboat motions
    lifeboat launching simulation
    Opis:
    This paper presents a computational model which describes motion of an object of six degrees of freedom (DoF), intended for simulation of spatial motion of one- or two- rope-sling lifeboat or rescue boat during its launching from ship in rough sea. This is a complex model which accounts for sea conditions as well as elasticity and damping properties of davit’s elements and mechanisms, rope and boat hull. Also, are presented results of example calculations for an assumed set of technical parameters of davit and boat as well as sea conditions.
    Źródło:
    Polish Maritime Research; 2012, 3; 45-52
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A numerical model to simulate the motion of a lifesaving module during its launching from the ship’s stern ramp
    Autorzy:
    Dymarski, P.
    Dymarski, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/260530.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    lifeboat
    rescue boat launch
    innovation
    launch ramp aft
    computational model for simulation
    Opis:
    The article presents a numerical model of object motion in six degrees of freedom (DoF) which is intended to be used to simulate 3D motion of a lifesaving module during its launching from a ship using a stern ramp in rough sea. The model, of relatively high complexity, takes into account both the motion of the ship on water in changing sea conditions, and the relative motion of the ramp with respect to the ship. The motion of the ramp changes and strongly depends on its constructional and geometrical parameters. The presented model takes into account the displacement of the submerged part of the ramp, as well as its damping in the water and the interaction with the module moving on it. The results of test simulation of a module launching from the ship in still water are included.
    Źródło:
    Polish Maritime Research; 2014, 2; 34-40
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vertical motions damping model test of a lifeboat lowered onto a flat sea surface
    Autorzy:
    Kniat, A.
    Dymarski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/259924.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    damping
    dynamics
    differential equations
    lowering a lifeboat
    numerical simulations
    Opis:
    The article presents the experiment’s results of the lifeboat model lowered with an initial speed and then released to fall onto a flat water surface. The purpose of the research is to determine the trajectory of the vertical boat motion and describe it with a mathematical model. This is closely related to determining the damping factor since the vertical motion is damped and the lifeboat gets balanced and stops moving after some time. The procedure of selecting parameters in the mathematical model to adjust to the results of the experiment was described in details. The summary describes the imperfections of the presented damping model and their probable causes.
    Źródło:
    Polish Maritime Research; 2018, S 1; 51-55
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technology concept of TLP platform towing and installation in waters with depth of 60 m
    Autorzy:
    Dymarski, C.
    Dymarski, P.
    Żywicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/259818.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    platform anchoring
    towing
    TLP platform installation
    Opis:
    The article is part of the design and research work conducted at the Gdansk University of Technology, Faculty of Ocean Engineering and Ship Technology, in cooperation with a number of other research centres, which concerns offshore wind farms planned to be built in the Polish zone of the Baltic sea in the next years. One of most difficult tasks in this project is building suitable foundations for each power unit consisting of a tower and a wind turbine mounted on its top. Since the water regions selected for building those wind farms have different depths, there was need to study different possible technical variants of this task, with the reference to both the foundation structures themselves, and the technology of their transport and setting, or anchoring. The article presents the technology of towing, from the shipyard to the setting place, and installation of the foundation having the form of a floating platform of TLP (Tension Leg Platform) type, anchored by tight chains to suction piles in the waters with depth of 60 m.
    Źródło:
    Polish Maritime Research; 2017, S 1; 59-66
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and strength calculations of the tripod support structure for offshore power plant
    Autorzy:
    Dymarski, C.
    Dymarski, P.
    Żywicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/259944.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    offshore wind turbine
    support structure
    Morison equation
    FEM
    Opis:
    The support structure being the object of the analysis presented in the article is Tripod. According to the adopted assumptions, it is a foundation gravitationally set in the water region of 60 m in depth, not fixed to the seabed, which can be used for installing a 7MW wind turbine. Due to the lack of substantial information on designing and strength calculations of such types of structures in the world literature, authors have made an attempt to solve this problem within the framework of the abovementioned project. In the performed calculations all basic loads acting on the structure were taken into account, including: the self mass of the structure, the masses of the ballast, the tower and the turbine, as well as hydrostatic forces, and aero- and hydrodynamic forces acting on the entire object in extreme operating conditions.
    Źródło:
    Polish Maritime Research; 2015, 1; 36-46
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Searching for critical conditions during lifeboat launching – simulations
    Autorzy:
    Dymarski, C.
    Dymarski, P.
    Kniat, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/260445.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    lifeboat launching
    numerical simulations
    kinematics
    Opis:
    The article describes numerical simulations of the process of lifeboat launching at the ship’s side. The research aimed at finding the values of ship motion parameters which appear to be most dangerous for people in the lowered lifeboat due to the generated accelerations. The simplified model of ship hull motion adopted at this research stage bases on a superposition of harmonic motions with given amplitudes and periods in six degrees of freedom. The range of the amplitude of motion for each degree of freedom corresponds approximately to that of possible motion of the PANAMAX type ship on the Baltic sea. In total, 120 960 cases of ship hull motion were examined.
    Źródło:
    Polish Maritime Research; 2017, S 1; 53-58
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effective method for determining environmental loads on supporting structures for offshore wind turbines
    Autorzy:
    Dymarski, P.
    Ciba, E.
    Marcinkowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/258490.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    offshore wind turbine
    support structure
    Morison force coefficients
    CFD
    sea wave statistics
    Baltic Sea
    Opis:
    This paper presents a description of an effective method for determining loads due to waves and current acting on the supporting structures of the offshore wind turbines. This method is dedicated to the structures consisting of the cylindrical or conical elements as well as (truncates) pyramids of polygon with a large number of sides (8 or more). The presented computational method is based on the Morison equation, which was originally developed only for cylindrically shaped structures. The new algorithm shown here uses the coefficients of inertia and drag forces that were calculated for non-cylindrical shapes. The analysed structure consists of segments which are truncated pyramids on the basis of a hex decagon. The inertia coefficients, CM, and drag coefficients, CD, were determined using RANSE-CFD calculations. The CFD simulations were performed for a specific range of variation of the period, and for a certain range of amplitudes of the velocity. In addition, the analysis of influence of the surface roughness on the inertia and drag coefficients was performed. In the next step, the computations of sea wave, current and wind load on supporting structure for the fifty-year storm were carried out. The simulations were performed in the time domain and as a result the function of forces distribution along the construction elements was obtained. The most unfavourable distribution of forces will be used, to analyse the strength of the structure, as the design load.
    Źródło:
    Polish Maritime Research; 2016, 1; 52-60
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    QoS Conditions for VoIP and VoD
    Autorzy:
    Dymarski, P.
    Kula, S.
    Huy, T. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/307870.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    delay jitter
    packet loss rate
    PESQ
    POLQA
    quality of service
    VoD
    VoIP
    VQM
    VQmon
    Opis:
    This paper concerns quality evaluation of the telecommunication services: VoIP (representing the RT interactive class) and VoD (representing the MM streaming class). Subjective and objective methods and tools for perceived quality measurement are analyzed and compared. Subjective tests are performed for selected video sequences using the Double-Stimulus Impairment Scale (DSIS) method. Thus the objective algorithms (VQM and VQmon) are calibrated. Speech quality is measured using the objective methods: PESQ and POLQA. Threshold values for network parameters (packet loss rate, delay jitter) are set, that guarantee the acceptable service quality.
    Źródło:
    Journal of Telecommunications and Information Technology; 2011, 3; 29-37
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of structure of tension leg platform for 6 MW offshore wind turbine based on FEM analysis
    Autorzy:
    Żywicki, J.
    Dymarski, P.
    Ciba, E.
    Dymarski, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/260390.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    offshore wind turbine
    TLP
    support structure
    FEM
    Opis:
    The article presents the calculation and design stages of the TLP platform serving as a supporting construction of a 6 MW offshore wind turbine. This platform is designed to anchor at sea at a depth of 60 m. The authors presented the method of parameterization and optimization of the hull geometry. For the two selected geometry variants, the load and motion calculations of the platform subjected to wind, wave and current under 50-year storm conditions were performed. The maximum load on the structure was determined in these extreme storm conditions. For these loads, the MES calculation of the designed platform was performed for the selected variant. Authors have presented a method for calculating maximum wind, wave and current stresses on the structure during the worst storm in the past 50 years. For these loads the MES endurance calculations of the designed platform were made. Based on the results of these calculations, the required structural changes and recalculations have been made in succession to the structural design of the platform, which meets the design requirements and has the required ad hoc strength. The article contains stress analysis in „difficult” nodes of constructions and discusses ways of solving their problems. The work is part of the WIND-TU-PLA project from the NCBR Research Agreement (Agreement No. MARTECII / 1/2014).
    Źródło:
    Polish Maritime Research; 2017, S 1; 230-241
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A method for the accurate numerical prediction of the tip vortices shed from hydrofoils
    Autorzy:
    Flaszyński, P.
    Szantyr, J. A.
    Dymarski, P.
    Kraskowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/259231.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    marine propulsors
    vortex generation
    numerical methods
    experimental techniques
    Opis:
    The possibly accurate numerical prediction of the detailed structure of vortices shed from the tips of hydrofoils is an important element of the design process of marine propellers. The concentrated tip vortices are responsible for the propeller cavitation erosion and acoustic emission. The purpose of the project described in this paper was to develop the numerical method for prediction of the tip vortex structure. In the course of the project the numerical calculations were confronted with the results of experimental measurements. This led to creation of the specific method of construction of the computational grid and to selection of the optimum turbulence model. As a result the reliable method for the accurate numerical prediction of the concentrated tip vortices for different hydrofoil geometry and flow conditions has been developed and validated. This method enables elimination of the unfavourable phenomena related to the tip vortices in the course of the propeller design calculations.
    Źródło:
    Polish Maritime Research; 2010, 2; 10-17
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An experimental and numerical study of the vortices generated by hydrofoils
    Autorzy:
    Szantyr, J. A.
    Biernacki, R.
    Flaszyński, P.
    Dymarski, P.
    Kraskowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/258826.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    marine propulsors
    vortex generation
    numerical methods
    experimental techniques
    Opis:
    The article presents the results of the research project concerning the process of formation of the tip vortices shed from hydrofoils of different geometry in different flow conditions. Three hydrofoils resembling the contemporary marine propeller blades have been selected for the study. The experimental part of the project consisted of the LDA measurements of the velocity field in three cross-sections of the vortex generated by the hydrofoils in the cavitation tunnel. The numerical part of the project consisted of calculations of the corresponding velocity field by means of three computer codes and several selected turbulence models. The comparative analysis of the experimental and numerical results, leading to the assessment of the accuracy of the numerical methods, is included.
    Źródło:
    Polish Maritime Research; 2009, 3; 11-17
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A design proposal of driving system for roof segments and gantry crane of ecological floating dock
    Autorzy:
    Dymarski, C.
    Łubiński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/260321.pdf
    Data publikacji:
    2005
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    floating dock
    shipboard equipmen
    gantry crane driving mechanisms
    systems of movable roof segments
    Opis:
    In the conceptual design of an ecological floating dock, has been assumed to be applied a roof system consisted of six movable segments whose aim is to shelter dock’s working space from environmental influence. The dock has to be also equipped with a gantry crane. Each of the devices is fitted with a traction system whose drive is the subject of this paper. The driving system consisted of synchronous electric motors with external frequency control of their rotational speed, is proposed. Such system may ensure the same rotational speed at both supports, unambiguously determined by voltage frequency and independent of load. The solution could make it possible to avoid dangerous skewing displacements of the structures on rail tracks during service. Additionally, a simplified procedure of determining the main loads necessary for calculation and selection of the devices and traction systems is also presented.
    Źródło:
    Polish Maritime Research; 2005, S 1; 65-69
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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