Stiffness characteristics of main bearings foundation of marine engine

• Autorzy: Murawski L.

Identyfikatory

DOI

10.5604/12314005.1213578

• Języki publikacji: EN

Abstrakty

EN

During shaftline alignment and crankshaft springing analyses, knowledge of stiffness of radial bearings is essential. Dynamic stiffness's characteristics of marine main body are difficult to estimate because of lack of available documentation and complicated shape of the body. In the literature, there is a lack of the detailed data on the stiffness of the crankshaft foundation in the frame of marine main engine. Those parameters are crucial for the shaft line alignment analysis as well as for the analysis of interactions between the shaft line and the crankshaft. Especially for the high power engines, the correct model of the boundary conditions plays a key role during the analysis. The paper presents the methodology of the characteristics determination of the marine engine’s body as well as the example of computations for a MAN B&W K98MC type engine mounted on a ~3000 TEU container ship. The model of main engine body is relatively big – it contains over 800 thousand degree of freedom. The elasticity of ship hull has been estimated and taken into account during analysis. It has been found, that static stiffness parameters recommended by the producer for the shaft line alignment are evaluated correctly, however they represent only the flexibility of the engine’s body, not taking into account the flexibility of the ship’s hull. What is more, the dynamic magnification of vibration amplitudes is not taken into account.

Słowa kluczowe

EN

dynamic stiffness of main engine bearings; shaft line alignment; crankshaft springing; marine propulsion system numerical analysis

• 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: 2016
• Tom: Vol. 23, No. 1
• Strony: 239--246
• Opis fizyczny: Bibliogr. 8 poz., rys.

Twórcy

autor

Murawski L.

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

Bibliografia

• [1] Murawski, L., Shaft line alignment analysis taking ship construction flexibility and deformations into consideration, Marine Structures No 1, Vol. 18, pp. 62-84, 2005.
• [2] Murawski, L., Szmyt, M., Stiffness characteristics and thermal deformations of the frame of high power marine engine, Polish Maritime Research, No 1(51), Vol. 14, pp. 16-22, 2007.
• [3] Zienkiewicz, O. C., Taylor, I. R. L., The Finite Element Method. Fourth edition, V. 1/2. McGraw-Hill, London 1992.
• [4] Bearings, MAN B&W Diesel A/S, Copenhagen 2000.
• [5] Elasto-hydro-dynamic evaluation of main bearing performance, MAN B&W Diesel A/S, Copenhagen 2002.
• [6] Guidance notes on propulsion shafting alignment, American Bureau of Shipping, Houston 2004.
• [7] Shafting alignment for direct coupled low-speed diesel propulsion plants, MAN B&W Diesel A/S, Copenhagen 1995.
• [8] Sulzer RTA-C, Technology Review, Wartsila, Helsinki 2003.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.