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Wyszukujesz frazę "roll motion" wg kryterium: Temat

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Numerical and analytical approaches for roll motion analysis in regular longitudinal waves
    Autorzy:
    Peşman, E.
    Kolukısa, D. C.
    Taylan, M.
    Tematy:
    parametric roll motion
    bifurcations
    panel method
    AQWA
    Pokaż więcej
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Powiązania:
    https://bibliotekanauki.pl/articles/258476.pdf  Link otwiera się w nowym oknie
    Opis:
    In this study numerical and analytical approaches were investigated in terms of accuracy of their results, practicality of solution and ability to reproduce the main features of the parametric roll phenomenon such as loss of stability and bifurcations in parametric roll motion analysis of ships. In general, single-degree-of-freedom analytical approach is based on reducing number of degrees of freedom from 3 to 1 by using the quasi-static Froude-Krylov assumption, incorporating heave and pitch effects by means of a time varying restoring moment. On the other hand, numerical approaches to motion of six and four degrees of freedom are based on three dimensional diffraction/radiation and potential flow theories. In summary, this paper reveals that analytical approaches are sufficiently adequate to obtain accurate practical results for this relatively complex phenomenon.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modified pid control design for roll fin actuator of nonlinear modelling of the fishing boat
    Autorzy:
    Alarçin, F.
    Demirel, H.
    Su, M. E.
    Yurtseven, A.
    Tematy:
    stability analyses
    nonlinear roll motion
    modified PID
    CFD
    Pokaż więcej
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Powiązania:
    https://bibliotekanauki.pl/articles/258902.pdf  Link otwiera się w nowym oknie
    Opis:
    This study aims to reduce roll motion of a fishing boat which arises from disturbing hydrodynamic effects by means of fin roll stabilizer. It is assured that roll motion with nonlinear damping and restoring moment coefficients are down to the desired level through classical PID and modified PID algorithms. At the time of sailing, stability, a very important concept, was examined using Lyapunov direct method taking initial conditions into consideration, and it was noted that the system was generally stable. In addition, NACA 0015 model was used for the fin roll stabilizer, and flow analysis was carried out with Computational Fluid Dynamics (CFD) method. In the simulation results, when the same gains were used, modified PID controller algorithms were relatively more effective compared to PID in the fin roll stabilizer system.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control design of fin roll stabilization in beam seas based on Lyapunov’s direct method
    Autorzy:
    Karakas, Safak C.
    Ucer, Erdem
    Pesman, Emre
    Tematy:
    fin stabilizers
    Lyapunov function
    roll motion
    white noise
    Pokaż więcej
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Powiązania:
    https://bibliotekanauki.pl/articles/258999.pdf  Link otwiera się w nowym oknie
    Opis:
    The aim of this study is to design a controller based on Lyapunov’s direct method for fin roll stabilization systems for ships in beam seas. A third order mathematical model consisting of uncoupled roll motion of a ship and fin hydraulic system dynamics is considered. In the model, random wind force is defined by Gaussian white noise. Both controlled and uncontrolled roll motions are presented considering stall effect by roll-time history and safe basin graphics. It is observed from the results that fin control system is successful to reduce erosion percentages of safe basins and roll amplitudes.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ship nonlinear roll motion identification using artificial neural network
    Autorzy:
    Mousavi, Seyed Mohamadreza
    Khoogar, Ahmad Reza
    Ghassemi, Hassan
    Tematy:
    nonlinear roll motion
    dynamic identification
    DTMB 5415
    roll decay
    artificial neural network
    Pokaż więcej
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Powiązania:
    https://bibliotekanauki.pl/articles/24202591.pdf  Link otwiera się w nowym oknie
    Opis:
    The solution of the nonlinear equation for a ship’s rotational motion around its longitudinal axis, even with simplifying assumptions, is complicated. This oscillatory motion, which is known as the roll motion, is generated when the ship sails in the waves, and the irregular behavior of the waves causes time-varying dynamics. Calculating the ship’s roll response is possible by determining roll equation coefficients. In the current study, the coefficients were determined from the dynamic response of the ship using a training feed-forward neural network. The training was carried out in two modes: as a free swing in calm water and forced oscillation in irregular waves. The DTMB 5415 vessel was selected as the case study ship. The results of the simulation by the neural network were validated by numerical analysis and model test results.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Overview of Roll Stabilizers and Systems for Their Control
    Autorzy:
    Kula, K.S.
    Tematy:
    Marine Controllers
    Roll Stabilizer
    Fin Stabilizer
    Non-Linear Process
    Multivariable Dynamic Process
    Roll Motion
    Computer Techniques
    Anti-Roll Tanks
    Pokaż więcej
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Powiązania:
    https://bibliotekanauki.pl/articles/117383.pdf  Link otwiera się w nowym oknie
    Opis:
    Ship roll motion in waves can be characterized as a strongly non-linear and multivariable dynamic process which is more affected by disturbances, in general, than by the maximal controlling parameter. The article presents methods of roll motion compensation, the majority of which have been used on ships for many years. Although they are not capable of reducing permanently the error to zero, their potential has still not been used to the full. The operational efficiency of roll motion compensators can be improved using control systems. Research activities are in progress to check the applicability of advanced control methods making use of modern computer techniques. Some of them are mentioned in this paper.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the modeling of car passenger ferryship design parameters with respect to selected sea-keeping qualities and additional resistance in waves
    Autorzy:
    Cepowski, T.
    Tematy:
    sea-keeping qualities
    roll-on/roll-off ferryship
    rolling
    motion sickness index
    lateral accelerations
    additional resistance in waves
    ship design parameters
    modeling
    artificial neural networks
    optimization
    Pareto method
    Pokaż więcej
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Powiązania:
    https://bibliotekanauki.pl/articles/258828.pdf  Link otwiera się w nowym oknie
    Opis:
    This paper presents the modeling of car passenger ferryship design parameters with respect to such design criteria as selected sea-keeping qualities and additional resistance in waves. In the first part of the investigations approximations of selected statistical parameters of design criteria of ferryship were elaborated with respect to ship design parameters. The approximation functions were obtained with the use of artificial neural networks. In the second part of the investigations design solutions were searched for by applying the singleand multi-criterial optimization methods. The multi-criterial optimization was performed by using Pareto method. Such approach made it possible to present solutions in such form as to allow decision makers (shipowner, designer) to select solutions the most favourable in each individual case.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of optimum hull form for passenger car ferry with regard to its sea-keeping qualities and additional resistance in waves
    Autorzy:
    Cepowski, T.
    Tematy:
    sea-keeping qualities
    roll-on/roll-off ferry ship
    rolling
    transverse accelerations
    vertical accelerations
    motion sickness index
    additional resistance in waves
    ship hull form
    ship design parameters
    artificial neural networks
    fuzzy logic
    Pokaż więcej
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Powiązania:
    https://bibliotekanauki.pl/articles/258898.pdf  Link otwiera się w nowym oknie
    Opis:
    This paper presents a method which makes it possible to determine optimum hull form of passenger car ferry with regard to selected sea-keeping qualities and additional resistance in waves. In the first phase of investigations a hull form characterized by the highest qualities was selected from the list of similar ships. Next, its optimum dimension ratios were determined. Design criteria were formulated by using a method based on deterministic scenarios, but objective functions of partial targets were determined in the form of artificial neural networks. To select the best design variants elements of fuzzy logic were used, that made it possible a.o. to show merits of the design by means of linguistic variables. Such approach made it possible to find the best hull form and its dimensions from the point of view of all considered criteria simultaneously.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of vehicle body roll angle on the motion stability and maneuverability of the vehicle
    Autorzy:
    Parczewski, K.
    Wnęk, H.
    Tematy:
    stability of vehicle motion
    suspensions
    interaction of the road and tires
    roll angle of vehicle body
    stabilność ruchu pojazdu
    zawieszenie
    interakcja drogi i opon
    Pokaż więcej
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Powiązania:
    https://bibliotekanauki.pl/articles/133587.pdf  Link otwiera się w nowym oknie
    Opis:
    The article discusses the impact of design solutions of vehicle suspensions into angles of body roll. It was shown which type of suspensions is better from this point of view. There were examined the dependence of the suspensions parameters on the vehicle body roll angle. The influence of camber angle on the force transmitted to the tire contact with the road surface was analysed. The lateral forces were measured on the test stand. There was tested dependency of lateral forces from the sideslip angle for different angles of camber. Was analysed change of lateral forces generated by camber angle on the vehicle which was made on a scale ~ 1:5 during tests carried out on the testing track. For this purpose, two tests have been selected: first one allowing the measurement in steady motion conditions, the second one with dynamic change of direction of vehicle motion. The graphs show the effect of camber angles on the controllability and stability of the vehicle motion.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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