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Investigation of the Aerodynamic Drag Force Exerted on a Powerboat

Czyż Zbigniew, Karpiński Paweł, Boujelbene Chahin

Advances in Science and Technology. Research Journal

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2020

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Vol. 14, no 3

141--148

EN

The aerodynamics of powerboats used in inshore powerboat racing has a significant impact on their performance. The aerodynamic drag forces generated on individual elements of this type of boats were tested. The solid model of the boat developed in the CAD software was used for the calculations. The computational grid was generated, as well as the boundary conditions and the turbulence model, were determined. On the basis of such assumptions, the numerical calculations were carried out using the CFD method. The results from the numerical simulations consist of a description of the velocity and pressure distribution around the tested object and identification of the drag force on the components of the powerboat with a description of the relationship between them. Additionally, the variation of the drag force as a function of speed in the range from 0 to 60 m/s was presented. The tests were performed for 5 values of the angle of attack of the boat to the surface of water in the range from 0° to 12°. The scope of the research allowed for the development of a drag force map depending on the defined parameters. The test results can be used to optimize the shape of the boat structure in order to reduce the aerodynamic drag generated on its individual elements.

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BWTBoat as an innovative solution to the problem of ballast water treament in the light of the ballast convention

Barańska M., Patil S.

Autobusy : technika, eksploatacja, systemy transportowe

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2017

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R. 18, nr 6

59--62, CD

EN

The article discusses the concept of using specialist BWTBoat developed by the Indian Register of Shipping (IRClass) as an innovative solution to the problem of ballast water treatment. The article presents a concept of mobile ballast water treatment boats delivering treated ballast water in reference to the requirements of the International Convention for the Control and Management of Ships' Ballast Water and Sediments (BWMC, adopted under the auspices of International Maritime Organisation in London in 2004), which will come into force on 8 Sep 2017. The article presents the possibility to use BWTBoats as other method of ballast water management.

PL

W artykule omówiona została koncepcja wykorzystania specjalistycznych barek (BWTBoat) opracowana przez Indyjskie Towarzystwo Klasyfikacyjne (IRClass) jako innowacyjne rozwiązanie problemu oczyszczania wód balastowych . Artykuł przedstawia koncepcję mobilnych barek w odniesieniu do wymogów Międzynarodowej Konwencji o Kontroli i Postępowaniu ze Statkowymi Wodami Balastowymi i Osadami (BWMC, przyjętej pod auspicjami Międzynarodowej Organizacji Morskie) w Londynie w 2004r., która wejdzie w życie w dn. 08.09.2017r. Artykuł prezentuje możliwości zastosowania BWTBoats jako innej metody zarządzania wodami balastowymi.

3

Specyfika urządzeń mobilnych na przykładzie rzeczywistych obiektów mechatronicznych

Filipek P., Kamiński T.

Logistyka

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2015

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nr 4

3203--3212, CD2

PL

Artykuł przedstawia zestawienie oraz podział obecnie znanych i stosowanych mobilnych systemów transportowych wraz z konkretnymi przykładami. Zawiera przykłady rzeczywistych obiektów mechatronicznych zbudowanych na Politechnice Lubelskiej w ramach naukowego koła zastosowań mechatroniki ELMECH, wraz z ich specyfikacją.

EN

The article presents parallel and division presently known and using mobile transport system with real examples. Included samples real mechatronics objects with specification to build on Lublin University of Technology by research mechatronics club ELMECH.

4

Zastosowanie odpadów poliestrowo-szklanych do zaprawy poliestrowej

Jastrzębska M., Jurczak W.

Przetwórstwo Tworzyw

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2013

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[R.] 19, nr 5 (155)

499--501

PL

Przy produkcji łodzi z laminatów powstają duże ilości odpadów poliestrowo-szklanych, które trafiają na składowiska. W pracy podjęto ocenę możliwości wykorzystania tych odpadów do zaprawy poliestrowej, która może służyć do uzupełnienia ubytków elementów konstrukcyjnych w dnie łodzi. Odpady poliestrowo-szklane zostały poddane procesowi rozdrobnienia, a następnie zastosowane do wytworzenia zaprawy poliestrowej. W zaprawie częściowo zastąpiono mączkę dolomitową rozdrobnionymi odpadami poliestrowo-szklanymi. Celem przedstawionej pracy było zbadanie przyczepności zaprawy do laminatów poliestrowo-szklanych.

EN

In the production of laminates boats generate large amounts of glass reinforced polyester waste, which, goes to landfills. The paper presents an assessment of the possibility of utilization of glass polyester waste as a filler of mortar, which can be used to supplement the loss of structural elements in the bottom of the boat. The glass reinforced polyester waste was ground and added to produce new composites. In mortar the dolomite dust was partially replaced by glass reinforced polyester waste. The aim of this work was to determine of the adhesion of the mortar to the fiberglass laminates.

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Żaglowce frachtowe z Czerwińska n. Wisłą

Reszka A. W.

Kwartalnik Historii Nauki i Techniki

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2004

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R. 49, nr 2

69--112

EN

Obtaining aggregate from river beds used to be, for many centuries, a well-known and widely practiced procedure in Europe. The excavated material: sand, gravel or stones, was transported to its destination by water, using a variety of boats. The freight boats discussed in the current article were built in Czerwińsk on the Vistula and were used in the first half of the 20th century. The different types of flat-bottomed boats, called respectively bał, krypa and kajlak, had been perfected by boat-builders throughout centuries and were well adapted to sailing on the Vistula, a river whose water levels have always shown a lot o f variation. The knowledge and the skills o f the bargemen, as well as the sailing experience they had, enabled them to use navigational techniques necessary in sailing on rivers that based on utilizing windpower in sailing up-stream and the speed of the river current in sailing down-stream. Square rigging, which had for a long time been typical for sailing on the Vistula, was replaced at the turn o f the 18th and 19th centuries by sprit rigging, which was easier to use and did not require large crews; this type of rigging was imported to Poland form Prussia, and along with it came the terminology for rigging. Sails were the only means of propelling boats up-stream. Sailing down-stream was based on the rafting principle, i.e. on utilizing the phenomenon of planing speed, which consists in a boat gaining acceleration with regard to the speed of the water current in the river, resulting from the boat’s hull skimming against the natural inclined plane formed by the water level of the river compared to the adopted level. The navigation technique involved was a “secret science” and that is why it remains unknown to historians of rafting on the Vistula river. Boats from Czerwińsk, and especially bats were used mainly for transporting construction gravel for building sites in Warsaw at which concrete was used. The bats were built with great care in boatbuilding workshops, which differed very little from workshops that operated in the 16th century. When in motion, the relatively narrow body o f the bat eliminated head resistance, and that is why bats could attain significant speeds under sail. The rapid development of obtaining aggregate by mechanical means at the end of the 1940s caused freight sailboats to be gradually eliminated from the Vistula, as they were unable to withstand

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Metodyka obliczeń numerycznych ułożenia okrętowych linii wałów

Murawski L., Ostachowicz W., Krawczuk M., Żak A.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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1998

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z. 6

255-260

PL

W pracy przedstawiono nową metodę obliczeń optymalnego układania okrętowych linii wałów.; Zaprezentowano specjalistyczne programy komputerowe do wyznaczania linii ugięcia oraz obciążeń wału korbowego i linii wałów oraz do wyznaczania sztywnościowo-tłumieniowych charakterystyk dynamicznych łożysk okrętowych. Przeprowadzono analizę wpływu sposobów modelowania elementów układu napędowego na wyniki obliczeń parametrów pracy układu przeniesienia mocy.

EN

In the paper a new original method of marine shaft line alignment analysis is presented. Specialised numerical algorithms are used to determined shaft line deflection and crankshaft loading and also to determined stiff-dumping dynamic characteristics of the marine bearings. Modelling methods of the power transmission system and its involving on analysis results are discussed.