Temat: hull - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: On graphs with a unique minimum hull set
Autorzy:: Chartrand, Gary
Zhang, Ping
Tematy:: geodetic set
geodetic number
convex hull
hull set
hull number
hull graph; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Powiązania:: https://bibliotekanauki.pl/articles/743417.pdf Link otwiera się w nowym oknie
Opis:: We show that for every integer k ≥ 2 and every k graphs G₁,G₂,...,Gₖ, there exists a hull graph with k hull vertices v₁,v₂,...,vₖ such that link $L(v_i) = G_i$ for 1 ≤ i ≤ k. Moreover, every pair a, b of integers with 2 ≤ a ≤ b is realizable as the hull number and geodetic number (or upper geodetic number) of a hull graph. We also show that every pair a,b of integers with a ≥ 2 and b ≥ 0 is realizable as the hull number and forcing geodetic number of a hull graph.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Estimation of the vessels sailing resistance in the preliminary analyses
Autorzy:: Charchalis, Adam
Tematy:: merchant vessel
hull dimensions parameters
hull coefficient
hull resistance
hull power of the vessel; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/247078.pdf Link otwiera się w nowym oknie
Opis:: In this article is presented the methodology of calculation of principal parameters of hull a vessel and resistance components. The approximate method is based on the analysis of the results of model tests and surrender tests presented in the literature. Ship owners' preliminary assumptions for new ship consist of deadweight, speed-shipping line and others. This goal needs definition of principal dimensions of a vessel, which are the basis for further calculations of hull’s resistance and evaluation of necessary power of main engine to fulfil shipping requirements. The route and its environment, type of cargo, quantity to be moved, and value of the cargo and port facilities are typical features, which will be considered when evolving the size, speed, and specification of a suitable ship. Specific service requirements will be similarly considered when evolving vessels such as warships, passenger ships or fishing vessels. Selection of main dimensions of vessel is limited by related to seaways or harbours characteristic and limitations rules regarding buoyancy, stability, hull strength, manoeuvring capability, etc. The influence of the main dimensions of the ship and their coefficients of maritime and strength properties of the ship were presented. Moreover, formulas for calculation of the ship's resistance components, such as friction resistance, and wave shape, as well as the results of calculations for different types of ships, for the assumed deadweight and speed of sailing, are presented.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Estimating the main dimensions of the ship’s hull
Autorzy:: Charchalis, A.
Tematy:: seagoing ships
hull coefficient
hull dimensions parameters; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/247088.pdf Link otwiera się w nowym oknie
Opis:: Preliminary ship owner's assumptions for new ship consist of deadweight, speed-shipping line and others. Taking it as a base, in early stage of design one has to select propulsion type. This goal needs definition of principal dimensions of a vessel, which are the base for further calculations of hull’s resistance and evaluation of necessary power of main engine to fulfil shipping requirements. Selection of main dimensions of vessel is limited by rules regarding buoyancy, stability, hull strength, manoeuvring capability, and limitations related to seaways or harbours characteristic. In this article is presented the methodology of calculation of principal parameters of a vessel, necessary for calculation of displacement in relation to vessel’s type, volumetric coefficients, Froude number, and others values affecting ship’s dimensions. It is about midship section coefficient, waterline coefficient, prismatic coefficient. Those values are necessary for calculation of hull resistance. In the article, are presented major constraints for designing of new vessels coming from ship-owner assumptions such as seafaring limitations. In the table is presented comparison of results of calculations above-mentioned values of three type of vessels representing same displacement. There are also presented different calculation methods of transverse midship section coefficient and wet area coefficient, for 3 types of vessels (container vessel, bulk carrier and tanker with displacement of 120000 t.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Dimensional constraints in ship design
Autorzy:: Charchalis, A.
Tematy:: ship principal dimensions
hull volumetric coefficients
hull design; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/245380.pdf Link otwiera się w nowym oknie
Opis:: The paper presents general rules for calculations of ship’s hull principle dimensions at preliminary stage of design process. There are characterized and defined basic assumptions of design process and limitations for calculations of dimensions and some criteria numbers. Limitations are an outcome of shipping routes what is related to shipping restrictions, diminishing of hull drag, achieving of required strength of hull and safety of shipping requirements. Shipping limitations are because of canals and straits dimensions or harbours drafts. In order to diminish propulsion power, what is related to economically justified solution, selected form and dimensions of hull must ensure minimizing of resistance, including skin friction and wavemaking resistance. That is why proper selection of coefficients of hull shape and dimensional criteria according to ship owner’s requirements i.e. deadweight (DWT) or cargo capacity (TEU), speed and seakeeping. In the paper are analyzed dimensional constraints due to shipping region, diminishing of wavemaking and skin friction resistance or application of Froude Number, ships dimensional coefficients (block coefficient, L/B, B/T, L/H) and coefficients expressing relations between capacity and displacement. The scope of applicability above presented values for different modern vessels construction were analyzed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Designing constraints in evaluation of ship propulsion power
Autorzy:: Charchalis, A.
Tematy:: seagoing ships
hull coefficient
hull dimensions parameters
propulsion power; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/244237.pdf Link otwiera się w nowym oknie
Opis:: Preliminary ship owners' assumptions for new ship consist of deadweight (for container vessel load capacity TEU), speed shipping line and others. Taking it as a base, in early stage of design one has to select propulsion type. This goal needs definition of principal dimensions of a vessel, which are the base for further calculations of hull’s resistance and evaluation of necessary power of main engine (engines) to fulfil shipping requirements. Selection of main dimensions of vessel is limited by rules regarding buoyancy, stability, hull strength, manoeuvring capability, and limitations related to seaways or harbours characteristic. In this paper is presented the methodology of calculation of principal parameters of a vessel, necessary for calculation of displacement in relation to vessel’s type, volumetric coefficients, Froude number, and others values affecting ship’s dimensions. It is about midship section coefficient, waterline coefficient, prismatic coefficients and hull feature and area coefficients. Those values are necessary for calculation of hull resistance. In the table are presented comparison of results of calculations above mentioned values and movement resistance and propulsion power of three container vessels representing different load capacity and one bulk carrier. There are also presented different calculation methods of transverse midship section coefficient and wet area coefficient, for 5000TEU container vessel.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Model tests of fast units on the open waters of Jeziorak Lake
Autorzy:: Brzoska, E.
Grygorowicz, M.
Krężelewski, M.
Rogalski, A.
Tematy:: fast units
single hull
twin hull
model tests
speedboats; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/258512.pdf Link otwiera się w nowym oknie
Opis:: Paper presents model tests of fast units carried out in the years 1956-2000 in the Experimental Centre of the Gdansk University of Technology Shipbuilding Institute on Jeziorak Lake. The experimental tests included single- and twin-hull hydrofoils, amphibian hovercraft, side-wall hovercraft and also speedboats and SWATH type catamarans. The aim of those tests was to acquire data for developing the design and safety criteria as well as computer programs for predicting the hydrodynamic properties of fast units. The gathered experimental material was used in the theoretical studies, publications and conference papers.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: The hull number of strong product graphs
Autorzy:: Santhakumaran, A.
Ullas Chandran, S.
Tematy:: strong product
geodetic number
hull number
extreme hull graph; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Powiązania:: https://bibliotekanauki.pl/articles/743965.pdf Link otwiera się w nowym oknie
Opis:: For a connected graph G with at least two vertices and S a subset of vertices, the convex hull $[S]_G$ is the smallest convex set containing S. The hull number h(G) is the minimum cardinality among the subsets S of V(G) with $[S]_G = V(G)$. Upper bound for the hull number of strong product G ⊠ H of two graphs G and H is obtainted. Improved upper bounds are obtained for some class of strong product graphs. Exact values for the hull number of some special classes of strong product graphs are obtained. Graphs G and H for which h(G⊠ H) = h(G)h(H) are characterized.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Energy saving procedures for fishing vessels by means of numerical optimization of hull resistance
Autorzy:: Abramowski, T.
Sugalski, K.
Tematy:: CFD
hull shape optimization
fishing boat
hull resistance
OpenFoam
simulation; Pokaż więcej
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Powiązania:: https://bibliotekanauki.pl/articles/135190.pdf Link otwiera się w nowym oknie
Opis:: This paper presents the general method for hull shape optimization of fishing boats with the objective of reducing resistance. In particular, it presents an example of the results of the application of resistance-reducing devices such as the ducktail, the cylindrical bulb and the streamlined bulbous bow. The resistance was determined using computational fluid dynamics (CFD). For the purpose of flow simulation, the OpenFoam system, distributed under an open source license, was used. The turbulent, unsteady flow with free surface liquid around the analyzed hulls was computed and investigated for potential resistance reduction. Ultimately, the calculation results were generalized by the parameterization of dimensionless geometric variables for the shape of a bulbous bow and were given in a form suitable for practical application in the hull design process.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Metoda wyznaczania linii ugięcia kadłuba okrętu
The method of determining the line of the ship hull deflection
Autorzy:: Pawlędzio, A.
Tematy:: kadłub okrętu
fale
konstrukcja kadłuba
ship hull form
waves
hull design; Pokaż więcej
Wydawca:: Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Powiązania:: https://bibliotekanauki.pl/articles/223227.pdf Link otwiera się w nowym oknie
Opis:: W niniejszym opracowaniu rozpatruje się zagadnienie wyznaczenia linii ugięcia kadłuba okrętu na wodzie spokojnej oraz na fali. Obliczenia testowe przeprowadzono dla zamkniętego odcinka rury, a następnie po zweryfikowaniu numerycznej metody obliczeniowej z rozwiązaniem analitycznym dla okrętu typu 207M. Opisywane rozwiązanie bazuje na metodzie elementów skoń-czonych [2]. Przyjęty model belkowy konstrukcji kadłuba okrętu składa się z dwudziestu elemen-tów o stałej długości.
The paper presents the method for determining the line of ship’s hull. Test computations were carried out for a closed section of a tube and then, after verifying the numerical computation method with the analytical solution, for the ship type 207M. The calculating process described is based on the finite element method. The adopted beam model of ship’s hull consists of 20 ele-ments of constant length.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Numerical analysis of initial and boundary conditions influence on the crew of tracked vehicle and the ground
Autorzy:: Barnat, W.
Panowicz, R.
Niezgoda, T.
Dybcio, P.
Tematy:: hull design
tracked vehicle; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/243703.pdf Link otwiera się w nowym oknie
Opis:: The problem of vehicle's impact resistance is broadly discussed in many articles and standardizations concerning special structures. In this paper, the numerical analysis results of an armoured vehicle loaded with blast wave are presented. Effects of ground proximity such as wave reflection are also taken into account. What is more, the tracking system was also included in calculations. The ground was modelled using Mie-Grüneisen equation of state. In the research an ALE coupling algorithm was used to model interaction between fluid (Euler domain) and structure (Lagrange domain). Euler description is used for air and blast wave propagation modelling, whereas structure is described by Lagrange equations of mass, momentum and energy conservation. The ALE coupling algorithm is implemented in MSC Dytran software. The problem was solved using explicit integration of movement equations over time. The research showed that ground and wheels considerably affect the simulation results. The pressure impulse on the vehicle's bottom increased by 40 per cent compared to the model in which these effects were not considered. Furthermore, the quality of the results increased as the solution obtained is more physical. Proposed method is a useful tool in hull design process. As well as that, the method will be further developed to include more detailed model of the vehicle.
Dostawca treści:: Biblioteka Nauki

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