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    Wyświetlanie 1-7 z 7
    Tytuł:
    A graphical method for Great Circle Routes
    Autorzy:
    Hsu, T. P.
    Chen, C. L.
    Hsieh, T. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/259336.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    transoceanic shipping
    great circle route
    waypoints
    celestial meridian diagram
    Opis:
    A great circle route (GCR) is the shortest route on a spherical earth model. Do we have a visual diagram to handle the shortest route? In this paper, a graphical method (GM) is proposed to solve the GCR problems based on the celestial meridian diagram (CMD) in celestial navigation. Unlike developed algebraic methods, the GM is a geometric method. Appling computer software to graph, the GM does not use any equations but is as accurate as using algebraic methods. In addition, the GM, which emphasizes the rotational surface, can depict a GCR and judge its benefit.
    Źródło:
    Polish Maritime Research; 2017, 1; 12-21
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A systematic approach for solving the great circle track problems based on vector algebra
    Autorzy:
    Chen, C. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/260175.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    great circle
    vector algebra
    multiple products
    spherical trigonometry
    Opis:
    A systematic approach, based on multiple products of the vector algebra (S-VA), is proposed to derive the spherical triangle formulae for solving the great circle track (GCT) problems. Because the mathematical properties of the geometry and algebra are both embedded in the S-VA approach, derivations of the spherical triangle formulae become more understandable and more straightforward as compared with those approaches which use the complex linear combination of a vector basis. In addition, the S-VA approach can handle all given initial conditions for solving the GCT problems simpler, clearer and avoid redundant formulae existing in the conventional approaches. With the technique of transforming the Earth coordinates system of latitudes and longitudes into the Cartesian one and adopting the relative longitude concept, the concise governing equations of the S-VA approach can be easily and directly derived. Owing to the advantage of the S-VA approach, it makes the practical navigator quickly adjust to solve the GCT problems. Based on the S-VA approach, a program namely GCTPro_VA is developed for friendly use of the navigator. Several validation examples are provided to show the S-VA approach is simple and versatile to solve the GCT problems.
    Źródło:
    Polish Maritime Research; 2016, 2; 3-13
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computation of the azimuth of the Great Circle in Cartesian coordinates
    Autorzy:
    Felski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/320573.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    azimuth
    Great Circle
    Cartesian coordinates
    Opis:
    The commonly known method of calculations connected with the Great Circle sailing and with similar tasks is executed by navigators with geographical coordinates. This paper deals with the possibility of azimuth calculations of the direction between two points on the Earth surface with 3-D Cartesian coordinate system.
    Źródło:
    Annual of Navigation; 2011, 18; 45-53
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficiency of a voluntary speed reduction algorithm for a ship’s great circle sailing
    Autorzy:
    Wang, H.
    Mao, W.
    Eriksson, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/117253.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    great circle sailing
    algorithm, ship’s sailing route
    route planning
    Dynamic Programming (DP)
    great circle route
    great circle (orthodrome)
    Estimated Time of Arrival (ETA)
    Opis:
    The great-circle is the shortest distance between two points on the surface of the earth. When planning a ship’s sailing route (waypoints and forward speeds) for a specific voyage, the great circle route is commonly considered as a reference route, especially for ocean-crossing seaborne transport. During the planning process, the upcoming sea weather condition is one of the most important factors affecting the ship’s route optimization/planning results. To avoid encountering harsh conditions, conventional routing optimization algorithms, such as Isochrone method and Dynamic Programming method, have been developed/implemented to schedule a ship’s optimal routes by selecting waypoints around the great circle reference route based on the ship’s operational performances at sea. Due to large uncertainties in sea weather forecast that used as inputs of these optimization algorithms, the optimized routes may have worse performances than the traditional great circle sailing. In addition, some shipping companies are still sailing in or making charting contracts based on the great circle routes. Therefore, in this study, a new optimization algorithm is proposed to consider the voluntary speed reduction with optimal speed configuration along the great circle course. The efficiency of this method is investigated by comparing these two methods for optimal route planning with respect to ETA and minimum fuel consumption. A container ship sailing in the North Atlantic with full-scale performance measurements are employed as the case study vessels for the comparison.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 2; 301-308
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On computational algorithms implemented in marine navigational software used in marine navigation electronic devices and systems
    Autorzy:
    Weintrit, A.
    Kopacz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/320655.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    ECDIS
    great circle
    rhumb-line
    sailing calculations
    Opis:
    In the paper the authors attempt to present the computational problem related to the navigational algorithm (meridian arc formula) implemented in the software applied in marine navigation electronic devices and systems, such as GNSS (GPS, GLONASS, Galileo), AIS, ECDIS/ECS, and other marine GIS. From the early days of the development of the basic navigational software built into satellite navigational receivers, it has been noted that for the sake of simplicity and a number of other reasons, this navigational software is often based on the simple methods of limited accuracy. It is surprising that even nowadays the use of navigational software is still used in a loose manner, sometimes ignoring basic computational principles and adopting oversimplified assumptions and errors such as the wrong combination of spherical and ellipsoidal calculations in different steps of the solution of a particular sailing problem. The lack of official standardization on both the ‘accuracy required’ and the equivalent ‘methods employed’, in conjunction to the ‘black box solutions’ provided by GNSS navigational receivers and navigational systems (ECDIS and ECS) suggest the necessity of a thorough examination of the issue of sailing calculations for navigational systems and GNSS receivers.
    Źródło:
    Annual of Navigation; 2012, No. 19, part 2; 171-184
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sphere – to – spheroid comparison – numerical analysis
    Autorzy:
    Lenart, A. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/259642.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    sphere in navigation
    great circle distance
    geodesics
    direct and inverse geodesic solutions
    numerical simulations
    Opis:
    Differences of orthodromic distances calculated on the sphere in comparison to the spheroid are numerically analyzed in the full range of departure point latitudes, courses over the ground and orthodromic distances for the global and limited range of latitudes. Optimum solutions for the radii of the sphere are provided.
    Źródło:
    Polish Maritime Research; 2017, 4; 4-9
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    THE ESSENTIAL CONNECTION BETWEEN MODERN SCIENCE AND UTOPIAN SOCIALISM
    Autorzy:
    Redpath, Peter A.
    Powiązania:
    https://bibliotekanauki.pl/articles/507570.pdf
    Data publikacji:
    2014
    Wydawca:
    International Étienne Gilson Society
    Tematy:
    agent intellect
    ancient
    artist
    colleges
    creative free spirit
    creator
    destroy
    explanation
    false
    fairy tale
    force
    freedom
    general will
    God
    great idea
    history
    humanities
    idea
    illumine
    imagination
    intellect
    light
    literature
    meditation
    metaphysics
    modern science
    modern socialism
    morality
    nature
    philosopher
    philosophy
    positivism
    propaganda
    psychology
    pure reason
    reality
    reason
    science
    scientific
    scientist
    seeker
    selfcreator
    sight
    social science
    social system
    socialism
    sophistry
    speculative
    surrealism
    system
    theology
    tolerance
    totalitarianism
    truth
    universal methodic doubt
    universities
    utopian socialism
    Vienna Circle
    violence
    violent
    virtue
    West
    will
    wisdom
    Opis:
    The chief aim of this paper is to demonstrate beyond reasonable doubt how, through an essential misunderstanding of the nature of philosophy, and science, over the past several centuries, the prevailing Western tendency to reduce the whole of science to mathematical physics unwittingly generated utopian socialism as a political substitute for metaphysics. In short, being unable speculatively, philosophically, and metaphysically to justify this reduction, some Western intellectuals re-conceived the natures of philosophy, science, and metaphysics as increasingly enlightened, historical and political forms of the evolution of human consciousness toward creation of systematic science, a science of clear and distinct ideas. In the process they unwittingly wound up reducing contemporary philosophy and Western higher education largely into tools of utopian socialist political propaganda.
    Źródło:
    Studia Gilsoniana; 2014, 3; 203-220
    2300-0066
    Pojawia się w:
    Studia Gilsoniana
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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