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    Wyświetlanie 1-6 z 6
    Tytuł:
    Approach parameters in marine navigation - graphical interpretations
    Autorzy:
    Lenart, A. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/117260.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    anti-collision
    graphical interpretations
    approach parameters
    marine navigation
    closest point of approach (CPA)
    tome to the closest point of approach (TCPA)
    collision avoidance
    tactical manoeuvres
    Opis:
    In this paper approach parameters widely used collision avoidance systems such as the distance at closest point of approach and time to the closest point of approach and less known and used as the distance on course, the distance abeam and any distance and the times intervals to their occurrences are derived, analyzed and graphically interpreted in the combined coordinate system for position and motion. They can be used in collision avoidance systems and for reversed purposes - manoeuvring to required approach parameters, intentional approaches and naval tactical manoeuvres.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 3; 521-529
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Prevention of Landslides Using the Analytic Hierarchy Process (AHP) in a Geographic Information System (GIS) Environment in the Province of Larache, Morocco
    Autorzy:
    El Hamdouni, Ikram
    Ait Brahim, Lahsen
    El Mahsani, Abderahman
    Abdelouafi, Abdellah
    Powiązania:
    https://bibliotekanauki.pl/articles/2055772.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    landslides
    heuristic approach
    analytic hierarchy process (AHP)
    predictive parameters
    Opis:
    Landslides are one of the natural hazards that many countries around the world are facing. In Morocco, the Rif regions are the most affected by these phenomena. Each year they cause enormous damage to the road network and infrastructure, especially in our study region, the province of Larache. The study region is subject to several opening up and road construction projects, which is why it is necessary to predict and identify the most vulnerable areas beforehand, in order to propose measures and techniques which are adequate for protection and reinforcement. The main goal of this study is to develop a susceptibility map to ground movements using a multi-criteria spatial assessment approach, and in order to reduce subjectivity, we have used a method for analyzing such complex decisions, which is the analytic hierarchy process (AHP) implemented in the geographic information system (GIS). Seven factors have been considered as conditioning factors in the occurrence of landslides, which are: lithology, fracturing density, slope, aspect, land use, density of the hydrographic network, and altitude. To verify the results obtained, we performed a correlation analysis of ground movements, already inventoried and verified in the field, with the susceptibility classes that were calculated. This analysis is accompanied by a statistical study.
    Źródło:
    Geomatics and Environmental Engineering; 2022, 16, 2; 77-93
    1898-1135
    Pojawia się w:
    Geomatics and Environmental Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic response of a spur gear system with uncertain parameters
    Autorzy:
    Guerine, A.
    Hami, A. E.
    Walha, L.
    Fakhfakh, T.
    Haddar, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/280323.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    uncertainty
    spur gear system
    polynomial chaos approach
    gear parameters
    Opis:
    In this paper, we propose a new approach for taking into account uncertainties based on the projection on polynomial chaos. The new approach is used to determine the dynamic response of a spur gear system with uncertainty associated to gear system parameters. The simulation results are obtained by the polynomial chaos approach for dynamic analysis under uncertainty. The proposed approach is an efficient probabilistic tool for uncertainty propagation. It has been found to be an interesting alternative to the parametric studies. The polynomial chaos results are compared with Monte Carlo simulations.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2016, 54, 3; 1039-1049
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non-line analysis of stiffness in compression conditions
    Autorzy:
    Kahsin, M.
    Stecki, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/259810.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    numerical simulations
    uncertainty of model parameters
    reliability of results
    statistical approach
    limit load
    Opis:
    The analyzes were aimed at demonstrating the influence of parameters describing the deformation of the structure on the uncertainty of critical force, and the impact of technological imperfections on stress uncertainty in compression conditions. In a linear buckling analysis, the problem is considered only for the initial, permanent state of the stiffness matrix. In the case of demonstrating the influence of initial deformations on the behavior of the structure under load, it is necessary to visualize changes in stiffness over time. To this end, a non-linear MES analysis was carried out, which will take into account local changes in the stiffness of the model through a gradual increase in the load. Thus, the difference in stiffness is taken into account, which in the linear problem is infinite. The analysis was used to examine the local and global sensitivity of the parameters describing: plating thickness as well as deformation caused by the technological process on the stress value reduced by Huber hypothesis, and the value of normal stress. To take into account the influence of non-specified values of the magnitude of geometric deviations, and their simultaneous influence on the range of obtained results, the Experimental Planning Method and the Surface Method of Answers were used.
    Źródło:
    Polish Maritime Research; 2018, 2; 100-107
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Applying simulation studies to define further development of the Przemyslowy Canal in Szczecin
    Autorzy:
    Gucma, L.
    Boć, R.
    Bąk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/116081.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    port manoeuvering
    Port of Szczecin
    Przemyslowy Canal in Szczecin
    applying simulation study
    navigation safety
    safety of navigation
    parameters of waterways
    harbour approach channels design
    Opis:
    The increasing sizes of ships and lack of functionality of the existing solutions determine the interest in rebuilding the already existing solutions. Simulation models allow to analyse the possible modernisation variants taking into account the variability of elementary parameters. The article presents analysis results for the Przemyslowy Canal in Szczecin with respect to navigation safety and regulating traffic regulations in the Przemyslowy Canal taking into consideration the interests of all subjects involved. The paper applies real-time simulation methods based on manoeuvring simulators. After a thorough analysis that took into account the safety of navigation, further possibilities of development have been determined. Study results are aimed at designing new solutions in case of modernization of the Przemyslowy Canal in Szczecin.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 3; 547-552
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of speed dependent fault parameters in a coupled rotor-bearing system
    Autorzy:
    Lal, M.
    Satapathy, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/140014.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    speed-dependent dynamic parameters
    rotor-bearing-coupling
    misalignment
    analytical approach
    multiple faults
    Lagrange's method
    parametry dynamiczne zależne
    wirnik-łożysko-sprzęgło
    niewspółosiowość
    podejście analityczne
    błędy wielokrotne
    metoda Lagrange'a
    Opis:
    In rotating machineries, misalignment is considered as the second most major cause of failure after unbalance. In this article, model-based multiple fault identification technique is presented to estimate speed-dependent coupling misalignment and bearing dynamic parameters in addition with speed independent residual unbalances. For brevity in analysis, a simple coupled rotor bearing system is considered and analytical approach is used to develop the identification algorithm. Equations of motion ingeneralized co-ordinates are derived with the help of Lagrange’s equation and least squares fitting approach is used to estimate the speed-dependent fault parameters. Present identification algorithm requires independent sets of forced response data which are generated with the help of different sets of trial unbalances. To avoid/suppress the ill-conditioning of regression equation, independent sets of forced response data are obtained by rotating the rotor in clock-wise and counter clock-wise directions, alternatively. Robustness of algorithm is checked for different levels of measurement noise.
    Źródło:
    Archive of Mechanical Engineering; 2018, LXV, 3; 327-347
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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