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1
Content available A method for preliminary estimation of the length of midship body block to be inserted during ship’s conversion
Michalski J. P.
Polish Maritime Research
|
2017
|
nr 1
42--46
EN
The paper presents a method for preliminary estimation of the length of the midship body block, which inserted in the original hull, increases the deadweight of the ship in line with a required quantity. The method may be useful for establishing the scope of conversion to better adjust the ship for transportation tasks. The problem is formulated by using a mathematical model so selected that its solution, under set of assumptions, is obtained in a closed analytical form. The presented method can be useful for application to pre-investment analysis of the ship conversion costs and functional profits.
2
Content available Parametrical method for determining optimal ship carrying capacity and performance of handling equipment
Michalski J. P.
Polish Maritime Research
|
2016
|
nr 2
19--24
EN
The paper presents a method of evaluating the optimal value of the cargo ships deadweight and the coupled optimal value of cargo handling capacity. The method may be useful at the stage of establishing the main owners requirements concerning the ship design parameters as well as for choosing a proper second hand ship for a given transportation task. The deadweight and the capacity are determined on the basis of a selected economic measure of the transport effectiveness of ship – the Required Freight Rate. The mathematical model of the problem is of a deterministic character and the simplifying assumptions are justified for ships operating in the liner trade. The assumptions are so selected that solution of the problem is obtained in analytical closed form. The presented method can be useful for application in the preliminary ship design or in the simulation of pre-investment transportation task studies.
3
Content available Parametric method for evaluating optimal ship deadweight
Michalski J. P.
Polish Maritime Research
|
2014
|
nr 2
3--8
EN
The paper presents a method of choosing the optimal value of the cargo ships deadweight. The method may be useful at the stage of establishing the main owners requirements concerning the ship design parameters as well as for choosing a proper ship for a given transportation task. The deadweight is determined on the basis of a selected economic measure of the transport effectiveness of ship – the Required Freight Rate (RFR). The mathematical model of the problem is of a deterministic character and the simplifying assumptions are justified for ships operating in the liner trade. The assumptions are so selected that solution of the problem is obtained in analytical closed form. The presented method can be useful for application in the pre-investment ships designing parameters simulation or transportation task studies.
4
Content available A parametric method for preliminary determination of underwater vehicles deadweight
Michalski J. P.
Polish Maritime Research
|
2012
|
nr 2
11-16
EN
This paper describes a method useful for determination of load carrying capacity of underwater vehicle, elaborated on the basis of investigations of series of vehicles of systematically changed geometrical dimensions. By using the set of the series of vehicles their structural mass and displacement – at a given structural material and assumed maximum permissible submersion depth – were determined, and next – approximation formulae for deadweight of vehicles were obtained. Vehicle’s form may be consisted of one or a few cylindrical floats of circular cross-section, ended with caps. The floats are joined together with a space pipe frame. Acceptability of design solutions results from comparison of working stress values in float’s shell plating with permissible stresses as well as critical stresses. The presented method may be useful in the preliminary stage of designing the underwater vehicles - i.e. may serve for preliminary determination of a vehicle deadweight – at its given, or determined, geometrical dimensions, maximum permissible submersion depth, as well as a selected structural material.
5
Content available Preliminary Designing Method of External Pressure Vessels for Sea Subsurface Applications
Michalski J. P.
Polish Maritime Research
|
2010
|
nr 2
3-9
EN
This paper describes a unique engineering method intended for the preliminary designing of marine echo-location systems. The solved designing problem consists in determining geometrical parameters and selecting structural materials for a vessel of a buoyancy necessary to contain measuring instruments of a given mass, as well as its maximum gabarites and operational submersion depth. The assumed variability range of the system’s parameters determines a space of permissible applicability parameters of the method. Stress level related to permissible and critical stresses was assumed to be safety criterion for the vessel. The method may be applied also to solving converse problems consisting in determining maximum permissible submersion depth for a vessel made of assumed structural materials and having given geometrical parameters. The presented description of the method is illustrated by an example of its application.
6
Content available Parametric method for determination of motion characteristics of underwater vehicles, applicable in preliminary designing
Michalski J. P.
Polish Maritime Research
|
2009
|
nr 2
3-10
EN
This paper describes a method for preliminary designing the autonomous underwater vehicles (AUV), especially useful in the case when requirements concerning kinematic and dynamic parameters of vehicle motion are given in design assumptions. Concept of the method is based on dynamic equations which describe vehicle planar motion in vertical and horizontal directions, resulting from action of screw propellers or water ballast, respectively. The motion equations were determined by applying simplifications concerning both geometrical description of vehicle’s form and flow phenomena. Their solutions were obtained in the form of closed analytical expressions which are both of cognitive and practical merits as they can serve to assess influence of vehicle’s design parameters on its motion characteristics and simultaneously are convenient to formulate design optimization problems. Application of the method was illustrated by the attached examples dealing with determination of kinematic and dynamic characteristics of motion of the vehicle „Scylla” of set geometrical configuration and propulsion parameters.
7
Content available A parametric method for evaluation of resistance of swath ships
Michalski J. P.
Polish Maritime Research
|
2008
|
nr 1
3-10
EN
This paper contains formulation of a parametric method for evaluation of SWATH ship’s hull resistance. The method was elaborated on the basis of numerical calculation results obtained by using structural methods based on ship hydrodynamic theory and performed for sufficiently large series of body forms with systematically changing ship form parameters. Also, results of verifying investigations dealing with features of the method in question are presented by comparing the obtained resistance characteristics with those achieved by other authors as well as with ship model experimental test results. The obtained results of the verification indicate that the elaborated method can be useful in preliminary designing the SWATH ships.
8
Content available A method for selection of parameters of ship propulsion system fitted with compromise screw propeller
Michalski J. P.
Polish Maritime Research
|
2007
|
nr 4
3-9
EN
This paper concerns an algorithmic method for preliminary selection of parameters of ship propulsion system fitted with fixed screw propeller in the case when the ship’s operation is associated with significant changes of waterway depth and width, hull resistance of the ship and its service speed. Mathematical model arguments of the considered design problem are main ship design parameters identified in the preliminary design stage. Structure of the formulated model complies with formal requirements for continuous- discrete mathematical optimization problems. The presented examples of application of the method concern an inland waterways ship fitted with compromise screw propeller optimized in the sense of minimization of fuel consumption for passing a given route distance within a given time. The elaborated method may be especially useful in designing such ships as : coasters, inland waterways ships, tugs, pushers, trawlers, mine sweepers, icebreakers etc.
9
Content available remote Statistical data of hull main parameters useful for preliminary design of SWATH ships
Michalski J. P.
Archives of Civil and Mechanical Engineering
|
2007
|
Vol. 7, no 3
161-166
EN
The paper presents investigations of statislical relations between main design parameters of the SWATH ship hull shapes, carried out on bibliographical data or more than eighty ships. The statistical relations are presented in the form or histograms of: ship length L, length to breadth ratio LlB, Icngth lo depth ratio L/H, length to pontoon diamcter ratio L/D. Also approximated cxpressions are presented of thc relations between the ship length and vertical clearance Gap and between draught T and pontoon diameter D. The presented statistical expressions, supplemented with assumptions about relations between main dimensions and derived dimensions, may be used for determination or the fast SWATH ship main design parameters at the preliminary design stage or may be a basis for rational selection or the range of variation of main dimensions in a SWATH ship hull shape series.
PL
W pracy przedstawiono badania dotyczące statystycznych relacji głównych parametrów projektowych kadłuba statków typu SWATH, wykonanych w oparciu o zebrane w literaturze przedmiotu dane o ponad osiemdziesięciu statkach. Zależności statystyczne przedstawiono w postaci histogramów: długości statku L, histogramów wartości stosunków długości do szerokości UB, długości do wysokości bocznej UH, długości pływaków do ich średnicy UD. Ponadto przedstawiono zależności aproksymacyjne przedstawiające relacje między długością statku, a jego prześwitem Gap oraz zanurzeniem T, a średnicą pływaków D. Przedstawione zależności statystyczne, uzupełnione założeniami o relacjach między wymiarami głównymi i wymiarami pochodnymi, mogą służyć do wyznaczania głównych parametrów projektowych statków typu SW A TH na etapie projektowania wstępnego lub stanowić podstawę do racjonalnego doboru zakresu zmienności wymiarów głównych serii kształtów kadłuba statków typu SWATH.
10
Content available A method of predicting main propulsion power for inland waterways push trains
Michalski J. P.
Polish Maritime Research
|
2006
|
S 2
43-46
EN
This paper presents a method of predicting effective power demand (brake horse power – B.H.P.) for propulsion of inland waterways push train, useful in the preliminary design stages. By using it, on the basis of known main particulars of a given push train, i.e. its length, breadth, draught and speed, a generalized Admiralty formula can be determined and then the pusher propulsion power can be preliminarily predicted by making use of the elaborated structure of the formula. Application of the method is illustrated on the example of a two-segment push train of inland waterways passenger ship designed in the frame of the Eureka INCOWATRANS E!3065 project.
11
Content available A method for predicting propeller-hull interaction, applicable to preliminary design of inland waterways ships
Michalski J. P.
Polish Maritime Research
|
2006
|
S 2
80-84
EN
This paper presents a proposal of a parametric method for predicting the characteristics of wake fraction, w(x) and thrust deduction, t( ) x , of ship hull of the draught close to waterway depth. The method makes it possible to take into account an influence of low waterway depth in preliminary selecting propulsion system parameters of ships intended for operating in shallow waters, e.g. of inland waterways ships. The mathematical model of the problem was determined with taking into account the aspect of coding easiness of calculation algorithm to be applied to computer software useful in computer aided design. Application of the method was demonstrated with the use of the example characteristics of the passenger ship intended for operating in shallow waters on Berlin-Kaliningrad route, whose design was elaborated in the frame of the EU Eureka INCOWATRANS E!3065 project.
12
Content available A design concept of ecological tourist – passenger ship intended for Berlin-Królewiec (Kaliningrad) inland waterway service
Hołówko W., Michalski J. P., Rosochowicz K.
Polish Maritime Research
|
2006
|
S 2
5-9
EN
This paper presents a design concept of a novel passenger segment ship intended for navigating on Berlin- -Królewiec (Kaliningrad) inland waterway route, characteristic of application novel structural materials and engineering processes which make it possible to design structures in an innovative way and provide high operational merits for inland waterways ship. Conceptual, functional and technical assumptions for the designed ship as well as its service program was described. Exceptional features of the designed ship are : the general architectural concept which makes the ship free passing under small-clearance bridges and navigating in narrow and shallow waterways, possible, manufacturing technology of its hull structure made of „sandwich” panels as well as its combustion-electric engine (or combustion-hydraulic engine) propulsion system working on alternative ecological gas fuels.
13
Content available An algorithm for preliminary estimating hull structure mass and mass centre height of inland navigation ships
Michalski J. P.
Polish Maritime Research
|
2005
|
nr 1
8-12
EN
The paper presents an algorithm for preliminary calculation of mass and mass centre height of hull structure of inland navigation ships. It was elaborated basing on requirements of the Rules for the Classification and Construction of Inland Navigation Ships of Polish Register of Shipping, with application of a simplified method of estimating mass of hull plating stiffeners. The algorithm deals with the dimensioning of scantlings of structural members of classical ships intended for shipping dry cargo, and dry and liquid bulk cargoes; however it does not cover ships of entirely different structural arrangement such as roll-on-roll-offships fitted with heavy decks, as the dimensioning of their scantlings is based on different models.
14
Content available A parametric method for preliminary determining of mass characteristics of inland navigation ships
Michalski J. P.
Polish Maritime Research
|
2005
|
nr 3
9-14
EN
This paper presents a method for estimation of mass characteristics of vessels, elaborated with the use of an algorithm based on requirements of the Rules for the Classification and Construction of Inland Waterways Vessels of Polish Register of Shipping, and on a simplified method [6] for determination of mass of hull plating stiff"eners. The dimensioning method of hull structure scantlings based on this algorithm concerns classical vessels intended for the carrying of general cargo, dry and liquid bulk cargoes, which determine the range of the method application. The method does not cover vessels of different construction, e.g. roll-on-roll-off type vessels equipped with heavy decks, as the dimensioning of their scantlings is based on different relationships and models.
15
Content available Parametric method of preliminary prediction of the ship building costs
Michalski J. P.
Polish Maritime Research
|
2004
|
S 1
16-19
EN
Paper presents results of studies on a parametric method of predicting ship building costs - useful in the preliminaly design. Conception and theoretical basis of the method are presented, devised are also approximation formulae for estimating the building costs of the ship hull, ship equipment and the power plant with propulsion system. Factors of importance for the ship building costs are identified and a computational algorithm formulated. The useful character of the method is illustrated by examples of building cost predictions for four different ship types designed in the Eureka project E!2772, i.e.: SINE 202 universal container carrier, SINE 203 oil product tanker, SINE 204 ro-ro ship and SINE 205 river-sea ship.
16
Content available Parametric method of prediction of the ship operating costs
Michalski J. P.
Polish Maritime Research
|
2004
|
S 1
20-23
EN
Paper presents results of studies on a parametric method of predicting ship operating costs - useful in the preliminary ship design. Conception and theoretical basis of the method are presented, identified are also factors of significant importance for the ship operating costs, taking into account changes in the value of money. Approximation formulae for estimating the operating cost components have been developed as well as a computational algorithm based on a minimum Required Freight Rate (RFR). The useful character of the method is illustrated by examples of operating cost predictions for four different ship types designed in the Eureka project E!2772, i.e.: SINE 202 universal container carrier, SINE 203 oil product tanker, SINE 204 ro-ro ship and SINE 205 river-sea ship.
17
The TEMPUS program - "Computational Geometry for Ships" i.e. our first step towards the European Union
Michalski J. P., Oleksiewicz B.
Marine Technology Transactions. Technika Morska
|
2004
|
Vol. 15
151-160
EN
The paper presents an origin, scope, and realisation of the Joint European Project "COMPUTATIONAL GEOMETRY FOR SHIPS" organised and run at the Faculty of Ocean Engineering and Ship Technology, Gdansk University of Technology in 1993-1995, within the European Union Program TEMPUS. The project offered advanced courses in the modern methodology of geometric modelling and hydrodynamic evaluation of ship forms for students of the faculty and young engineers from the Polish shipbuilding industry. The project was financed from the European PHARE fund.
PL
W artykule przedstawiono genezę, zakres merytoryczny, zasady organizacji i opis realizacji Projektu p.t. "COMPUTATIONAL GEOMETRY FOR SHIPS", prowadzonego w latach 1993-1995 na Wydziale Oceanotechniki i okrętownictwa Politechniki Gdańskiej, w ramach Programu TEMPUS. Celem Projektu było zapoznanie studentów Wydziału, oraz młodych pracowników polskiego przemysłu okrętowego, z najnowszymi osiągnięciami w zakresie komputerowych metod modelowania geometrycznego i analizy hydrodynamicznej kształtu kadłuba okrętu. Projekt finansowany był z Europejskiego funduszu PHARE.
18
Optimisation of inland vessels ' route speed
Michalski J. P.
Marine Technology Transactions. Technika Morska
|
2004
|
Vol. 15
285-296
EN
Findings of the research into the method of speed selection and assessment of inland vessels' propulsion power demand, useful both at the predesign stages and in the inland fleet operation manamegent, e.g. while setting the itinerary of the cruise ships are presented in this paper. To solve the problem, a non-linear optimisation method - with some bounds - based on minimization of the used fuel cost and on the voyage duration as the criterion for assessment of perfection of the designed vessel was applied. Application of the method is illustrated by the push-train designed within the INCOWATRANS E!3065 Eureka Scheme.
19
A method of choosing the service speed of liner trade ships at the stage of establishing owners requirements
Michalski J. P.
Marine Technology Transactions. Technika Morska
|
1999
|
Vol. 10
227-236
EN
The paper presents a mathematical model of a method of choosing the service speed of liners ships. The method can be useful at the stage of establishing the main owners requirements conceming the ship design parameters. The ship speed is determined on the basis of a selected economic measure of the transport effectiveness of ship - the Required Freight Rate (RFR). The mathematical model ofthe problem is of a deterministic character and the sirnplifying assumptions are justified for ships operating in the liner trade. The assumptions are so selected that solution is obtained in analytical closed form. The presented method can be useful for application in the preinvestment simulation designing studies. After appropriate adaptation the method mayaIso be applied to other means of transport.
PL
W pracy przedstawiono model matematyczny uproszczonej metody doboru projektowej prędkości eksploatacyjnej statku, na etapie formułowania jego głównych założeń projektowych. Prędkość wyznaczana jest w oparciu o wybrane kryterium ekonomiczne miary efektywności transportowej statku - RFR - wymaganej minimalnej stawki frachtowej. Proponowany model matematyczny zagadnienia ma charakter deterministyczny, a przyjęte założenia odnoszą się w szczególności do statków eksploatowanych w żegludze liniowej. Odpowiedni dobór założeń upraszczających model pozwala na wyznaczenie rozwiązania analitycznego w formie zamkniętej, dogodnej do wyznaczania optymalnej - w zakresie przyjętego modelu - prędkości eksploatacyjnej statku. Przedstawiona metoda może być przydatna do prowadzenia przed inwestycyjnych badań symulacyjnych nad doborem parametrów zamawianego statku, przy uzmiennianiu prognozowanych uwarunkowań techniczno-ekonomicznych w czasie jego przyszłej eksploatacji. Opracowana koncepcja metodologiczna, po stosowej adaptacji, może być zastosowana do wyznaczania prędkości optymalnej również innych środków transportu.
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