Comparative analysis of the calculation methods of the marine propeller’s blade thickness

• Autorzy: Murawski L.

Identyfikatory

DOI

10.5604/01.3001.0012.2810

• Języki publikacji: EN

Abstrakty

EN

Strength of the propellers with the skewback greater than 25º has to be numerically analysed according to marine classification societies. The finite element method (FEM) is advised for that kind of calculations. Classical and typical propellers (skewback < 25º) may be designed on the base of empirical equations given by the societies. The minimal thickness of the propeller blade is determined by the equations. Each classification society has their own empirical formula. Sometimes, well-designed propeller for one society has not enough strength according to the other society. What is more, propellers designed according to the empirical formulas might be not optimal. Comparative analysis of the marine propeller’s blade strength has been described in the article. Calculations of the propeller’s blade thickness have been done by two international classification societies’ empirical formulas (ABS and DNV). The results have been compared with Finite Element Method calculations (NASTRAN program). The methodology of propeller static strength vibration analyses is presented. Numerical calculation methodology is based on solidstate mechanics with loadings determined by fluid mechanics calculations. Steady state and transient fluid flow of the propeller’s working conditions were taken into account. In order to determine the optimal modelling method of the propeller several different numerical models were compared, including free model of whole propeller and single blade with boundary conditions placed in the foot. The propeller optimization was the main target of the analyses. Propeller blade thickness might be reduced after FEM method analysis - the propeller mass saving can be achieved.

Słowa kluczowe

EN

marine propeller; strength; vibration; solid structure in fluid; FEM modelling methodology

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2018
• Tom: Vol. 25, No. 2
• Strony: 253--260
• Opis fizyczny: Bibliogr. 12 poz., rys.

Twórcy

autor

Murawski L.

• Gdynia Maritime University Faculty of Marine Engineering Morska Street 83-87, 81-225 Gdynia, Poland tel.: [phone], fax: [phone]

Bibliografia

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• [6] Murawski, L., Shaft line whirling vibrations: effects of numerical assumptions on analysis results, Marine Technology and SNAME News, Vol. 42 (2), pp. 53-61, 2005.
• [7] Murawski, L., Charchalis, A., Simplified method of torsional vibration calculation of marine power transmission system, Marine Structures, Vol. 39, pp. 335-349, 2014.
• [8] Senjanović, I., Vladimir, N., Tomić, M., Hadzić, N., Malenica, S., Some aspects of structural modelling and restoring stiffness in hydroelastic analysis of large container ships, Ships and Offshore Structures, Vol. 9 (2), pp. 199-217, 2014.
• [9] Szantyr, J., The lifting surface program for hydrodynamic analysis of marine propellers, Opracowanie Centrum Techniki Okrętowej, Nr RH-93/R-064, Gdansk 1993.
• [10] American Bureau of Shipping, Guidance notes on propulsion shafting alignment, Houston 2004.
• [11] Det Norske Veritas, Rules for classification of ships, Rotating Machinery, Power Transmission, Chapter 4, Part 4, 2013.
• [12] Germanisher Lloyd, Rules & Guidelines, Naval Ship Technology, Propulsion Plants, Chapter 2, III-1-2, 2012.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).