PUBLISHER : POLISH MARITIME RESEARCH No 4(54) 2007 Vol 14 CONTENTS 3 JAN P. MICHALSKI Address of Publisher & Editor's Office : A method for selection of parameters of ship propulsion system fitted with compromise screw propeller GDAŃSK UNIVERSITY 10 JAN A. SZANTYR OF TECHNOLOGY Faculty Dynamic interaction of the cavitating of Ocean Engineering propeller tip vortex with the rudder & Ship Technology 15 LESZEK PIASECZNY, ul. Narutowicza 11/12 KRZYSZTOF ROGOWSKI 80-952 Gdańsk, POLAND The effect of blade thickness on microstructure tel.: +48 58 347 13 66 and mechanical properties of ship’s sand-cast propeller fax : +48 58 341 13 66 18 TADEUSZ SZELANGIEWICZ, KATARZYNA ŻELAZNY e-mail : offi[email protected] Mean long-term service parameters Account number : of transport ship propulsion system. Part I BANK ZACHODNI WBK S.A. 24 MONIKA BORTNOWSKA I Oddział w Gdańsku Prediction of power demand for ship motion control system 41 1090 1098 0000 0000 0901 5569 of sea mining ship fitted with tubular winning system Editorial Staff : 31 TOMASZ CEPOWSKI Editor in Chief Kazimierz Kempa Application of artificial neural networks to approximation e-mail : [email protected] Przemysław Wierzchowski Scientific Editor and identification of sea-keeping performance e-mail : [email protected] of a bulk carrier in ballast loading condition Jan Michalski Editor for review matters 40 EUGENIUSZ KOZACZKA, JACEK DOMAGALSKI, e-mail : [email protected] GRAŻYNA GRELOWSKA, IGNACY GLOZA Tadeusz Borzęcki Editor for international relations Identification of hydro-acoustic waves emitted e-mail : [email protected] from floating units during mooring tests Piotr Bzura Managing Editor e-mail : [email protected] 47 TADEUSZ SZELANGIEWICZ, KATARZYNA ŻELAZNY Cezary Spigarski Computer Design Mean long-term service parameters e-mail : biuro@oficynamorska.pl of transport ship propulsion system. Part II 53 ZBIGNIEW SZYDŁO, LESZEK MATUSZEWSKI Domestic price : Experimental research on effectiveness single issue : 20 zł of the magnetic fluid seals for rotary shafts working in water Prices for abroad : 59 MARIUSZ KOPROWSKI single issue : An analysis of lubricating medium flow through - in Europe EURO 15 - overseas US$ 20 unsymmetrical lubricating gap of conical slide bearing 64 MARZENNA POPEK ISSN 1233-2585 The influence of organic polymer on properties of mineral concentrates 68 LESŁAW KYZIOŁ Shooting resistance of non-metallic materials POLISH 74 ZBIGNIEW KORCZEWSKI An overview of the didactic and scientific activity MARITIME at the faculty of mechanical and electrical engineering of the Polish Naval Academy RESEARCH The papers published in this issue have been reviewed by :Photo : C. Spigarski in internet Prof. W. Adamkiewicz ; Prof. Cz. Dymarski ; Prof. J. Girtler www.bg.pg.gda.pl/pmr.html Prof. W. Chądzyński ; Assoc. prof. T. Koronowicz Prof. T. Szelangiewicz ; Prof. Z. Zaczek Editorial POLISH MARITIME RESEARCH is a scientific journal of worldwide circulation. The journal appears as a quarterly four times a year. The first issue of it was published in September 1994. Its main aim is to present original, innovative scientific ideas and Research & Development achievements in the field of : Engineering, Computing & Technology, Mechanical Engineering, which could find applications in the broad domain of maritime economy. Hence there are published papers which concern methods of the designing, manufacturing and operating processes of such technical objects and devices as : ships, port equipment, ocean engineering units, underwater vehicles and equipment as well as harbour facilities, with accounting for marine environment protection. The Editors of POLISH MARITIME RESEARCH make also efforts to present problems dealing with education of engineers and scientific and teaching personnel. As a rule, the basic papers are supplemented by information on conferences , important scientific events as well as cooperation in carrying out interna- tional scientific research projects. Scientific Board Chairman : Prof. JERZY GIRTLER - Gdańsk University of Technology, Poland Vice-chairman : Prof. ANTONI JANKOWSKI - Institute of Aeronautics, Poland Vice-chairman : Prof. MIROSŁAW L. WYSZYŃSKI - University of Birmingham, United Kingdom Dr POUL ANDERSEN Prof. STANISŁAW GUCMA Prof. YASUHIKO OHTA Technical University Maritime University of Szczecin Nagoya Institute of Technology of Denmark Poland Japan Denmark Dr MEHMET ATLAR Prof. ANTONI ISKRA Prof. ANTONI K. OPPENHEIM University of Newcastle Poznań University University of California United Kingdom of Technology Berkeley, CA Poland USA Prof. GÖRAN BARK Prof. JAN KICIŃSKI Prof. KRZYSZTOF ROSOCHOWICZ Chalmers University Institute of Fluid-Flow Machinery Gdańsk University of Technology of PASci of Technology Sweden Poland Poland Prof. SERGEY BARSUKOV Prof. ZYGMUNT KITOWSKI Dr YOSHIO SATO Army Institute of Odessa Naval University National Traffic Safety Ukraine Poland and Environment Laboratory Japan Prof. MUSTAFA BAYHAN Prof. JAN KULCZYK Prof. KLAUS SCHIER Süleyman Demirel University Wrocław University of Technology University of Applied Sciences Turkey Poland Germany Prof. MAREK DZIDA Prof. NICOS LADOMMATOS Prof. FREDERICK STERN Gdańsk University University College London University of Iowa, of Technology United Kingdom IA, USA Poland Prof. ODD M. FALTINSEN Prof. JÓZEF LISOWSKI Prof. JÓZEF SZALA Norwegian University Gdynia Maritime University Bydgoszcz University of Science and Technology Poland of Technology and Agriculture Norway Poland Prof. PATRICK V. FARRELL Prof. JERZY MATUSIAK Prof. TADEUSZ SZELANGIEWICZ University of Wisconsin Helsinki University Technical University Madison, WI of Technology of Szczecin USA Finland Poland Prof. WOLFGANG FRICKE Prof. EUGEN NEGRUS Prof. WITALIJ SZCZAGIN Technical University University of Bucharest State Technical University Hamburg-Harburg Romania of Kaliningrad Germany Russia Prof. BORIS TIKHOMIROV Prof. DRACOS VASSALOS State Marine University University of Glasgow of St. Petersburg and Strathclyde Russia United Kingdom POLISH MARITIME RESEARCH 4(54) 2007 Vol 14; pp. 3-6 DOI: 10.2478/v10012-007-0032-y A method for selection of parameters of ship propulsion system fitted with compromise screw propeller Jan P. Michalski, Assoc. Prof. Gdańsk University of Technology Polish Naval University ABSTRACT 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. Keywords : design of inland waterways ships, ship propellers, ship propulsion INTRODUCTION Polish inland waterways are of small depth and often have AND PROBLEM DESCRIPTION the form of unregulated narrow river beds. In such case are fully justified the reasons for the application to inland navigation A method for selection of rational, or optimum in a given ships the propulsion systems with fixed screw propellers as they, sense, technical solutions of a ship should take into account, in comparison with those with controllable pitch propellers, already in the preliminary design stage, both obligatory and are characterized by : crucial design conditions and constraints. This paper concerns a low manufacturing, assembling and possible repair costs method for determining, in the preliminary design stage, optimum of the propellers values of the parameters of ship propulsion system fitted with higher reliability and resistance against failure during fixed screw propeller in the case where hull resistance and service stranding speed of the ship significantly varies during operation, that often higher power conversion efficiency. takes place in the case of inland navigation. Design process of inland navigation ships should takes For operators of inland navigation ships the high reliability into account the demand of adjusting the ship to future real of propulsion system and easiness of its repair possible to be service tasks including ship operation at significantly variable done even in almost any conditions along trip route are of propulsion performance characteristics of the ship, whose crucial importance. variability results from : CLASSICAL PROBLEM STATEMENT changeable hydrographic conditions in water area of ship operation – shallow waters, narrow canals of variable width, In the standard design method of preliminary selection of winding river bends ship propulsion system parameters the following phases can significant changes of ship draught and displacement during be distinguished : voyage 1st phase of the approximate determining of nominal hull frequent events of ship running aground and re-floating resistance characteristics in function of the speed ν, ship – unavoidable in shallow waters and waterway parameters p hull resistance changes at various hull configurations – in the case of multi-hull