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1
Content available Estimation of hydrodynamic coefficients from results of real ship sea trials
Kim D.
Polish Maritime Research
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2018
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nr 4
65--72
EN
This paper suggests an estimation method for ship’s hydrodynamic coefficients, which is based on the system identification method that calculates an optimum value in a mathematical way. For the purpose of modelling existing ships, this study collects real ship sea trial data as benchmarks. Prior to the optimization, a sensitivity analysis is carried out for easy and effective optimization. The simulation results using optimized coefficients agree well with corresponding benchmarks. Following this, with various trim and draught conditions, this study suggests new estimation formulas that concern all trim and draught conditions. Simulation results applying the estimation formulas are satisfactory in regard to a corresponding benchmark, compared to a result obtained by using an existing regression formula.
2
Content available Bank effect and operation of inland waterways vessels
Kobyliński L.
Zeszyty Naukowe / Akademia Morska w Szczecinie
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2014
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nr 37 (109)
50--55
EN
Inland waterways vessels operate in waters of restricted depth and restricted width with cross-section of the waterway of different profile. These conditions affect hydrodynamic forces acting on the vessel and in consequence they affect their operation. There are several hydrodynamic effects present in inland waterways. Restricted depth and cross-section of the canal or river affects resistance of the vessel and hydrodynamic characteristics of the propeller and in consequence propulsive efficiency. Another effect is caused by modification of pressure distribution around vessel body resulting in change of draft, so called squat. Finally in narrow fairway lateral forces on the vessel are created and in case of non-symmetrical position of the vessel, those forces are also non-symmetric and causing that the vessel is pushed to one side. This affects safe handling of the vessel and requires understanding and skill of operator. This problem is discussed in the paper.
3
Content available remote Problems of handling ships equipped with AZIPOD propulsion systems
Kobyliński L.
Prace Naukowe Politechniki Warszawskiej. Transport
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2013
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z. 95
231--245
EN
Large ships, mainly large cruise vessels, built during last two decades are quite often equipped with revolutionary propulsion devices known under the name AZIPODs. There are many reasons for choosing AZIPODs as main propulsion units, the main reason being excellent manoeuvring characteristics achieved. However in case of large propulsion units, having power of 15-25 MW, used for propulsion there are also some disadvantages and limitations, the last mainly related to operational factors. Handling of ships equipped with AZIPODS is different from handling conventional ships and in certain manoeuvring situations safety of the ship and of the propulsion units might be endangered.. Therefore some limitations imposed on handling procedures are necessary and it is essential that pilots and masters of ships fitted with AZIPODs must be specially trained.
PL
Duże statki, przede wszystkim wycieczkowce, budowane w ostatnich dwu dekadach wyposażane są zwykle w nowoczesne pędniki azymutalne znane pod nazwą komercyjną AZIPODY. AZIPODY są stosowane głównie dlatego, że zapewniają one statkowi doskonałe właściwości manewrowe. AZIPODY jako główne jednostki napędowe wykazują ponadto wiele zalet, jednakże w przypadku stosowania napędów o dużej mocy, rzędu 15-25 MW występują także pewne niekorzystne zjawiska i konieczne jest wprowadzanie pewnych ograniczeń, głównie w odniesieniu do manewrowania nimi. Manewrowanie statkami wyposażonymi w napęd AZIPODAMI różni się od manewrowania statkami konwencjonalnymi i w niektórych sytuacjach manewrowych bezpieczeństwo statku jak i jednostek napędowych może być narażone. W związku z tym wymagane jest zastosowanie specyficznych ograniczających procedur manewrowania i konieczne jest aby zarówno kapitanowie tych statków jak i piloci portowi przechodzili specjalne przeszkolenie.
4
Content available remote Some problems of berthing of ships with non-conventional propulsions
Koziol W., Galor W.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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2007
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Vol. 1, no. 3
319--324
EN
The berthing manoeuvre of ship is the last stage of navigation process. The safety of berthing depends on velocity due impact the quay. In case of ships with non-conventional propulsion (mainly two stern screws and few thrust propellers) the berthing manoeuvres are different then other ships. The paper presents an analysis the kind of ships power and their manoeuvrability features in aspect of safety berthing.
5
Content available Wind effect simulation system in model tests of ship manoeuvrability
Bednarek A., Jóźwiak R.
Polish Maritime Research
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2007
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S 2
64--67
EN
Dependence on hydro-meteorological conditions in the test area is an “Achilles’ heel” of physical experiment used for assessment of ship manoeuvrability. Aerodynamic forces and moments generated on the ship upperworks distort significantly the measured values. The paper presents new testing tool in the form of physical simulation of wind effect enabling quantitative evaluation of distortion of the measurement results. Another feature of the system enabling compensation of real atmospheric conditions prevailing during the experiment is also presented. The wind effects simulation arrangement includes board data acquisition and processing system, automatic control system and executive system consisting of industrial fans.
6
Content available remote A desktop ship manoeuvrability prediction system
Górnicz T.
Archives of Civil and Mechanical Engineering
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2007
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Vol. 7, no 3
115-123
EN
This paper presents low-cost, reasonable accurate system for model design factors influencing a ship's manoeuvrability. The presented system is based on modified Abkowitz's mathematical model, with both linear and non-linear differential equations.
PL
W pracy przedstawiono strukturę niedrogiego, umiarkowanie dokładnego systemu do określania parametrów, mających kluczowy wpływ na właściwości manewrowe statków. Zaproponowane rozwiązanie zostało opracowane na podstawie zmodyfikowanego modelu Abkowitza, zarówno dla liniowych i nie liniowych równań ruchu.
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