Influence of marine main engine foundations on the results of vibration calculations

• Autorzy: Murawski Lech

Identyfikatory

DOI

10.2478/kones-2019-0012

• Języki publikacji: EN

Abstrakty

EN

The article presents an influence of foundations of slow-speed main engine body on the results of numerical analysis of the engine dynamic stiffnesses and thermal deformations. The engine body is much stiffer than its foundation pads and ship hull (double bottom) – boundary conditions of the engine. Especially for the high power, marine engines, the correct model of the boundary conditions plays a key role during the analyses. Therefore, modelling method of engine foundation (boundary conditions) of that kind of model is essential during the analyses. During shaft line alignment and crankshaft springing analyses, knowledge of dynamic stiffnesses characteristics and thermal displacements of radial (main) bearings is significant. Those data of marine main engine body are difficult to estimate because of lack of available documentation and complicated shape of the engine and ship hull. The article 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 (power: 40000 kW, revolutions: 94 rpm) mounted on a 3000 TEU (twenty-foot container equivalent unit) container ship (length: 250 m). Numerical analyses were performed with usage of Nastran software based on Finite Element Method. The FEM model of the engine body comprised over 800 thousand degree of freedom.

Słowa kluczowe

EN

marine engines; shaft line alignment; crankshaft springing; boundary conditions; propulsion system

• 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: 2019
• Tom: Vol. 26, No. 1
• Strony: 95--101
• Opis fizyczny: Bibliogr. 9 poz., rys.

Twórcy

autor

Murawski Lech

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

Bibliografia

• [1] Fonte, M., Duarte, P., Anes, V., Freitas, M., Reis, L., On the assessment of fatigue life of marine diesel engine crankshafts, Engineering Failure Analysis, Vol. 56, pp. 51-57, 2015.
• [2] Song, M. C., Moon, Y. H., Coupled electromagnetic and thermal analysis of induction heating for the forging of marine crankshafts, Applied Thermal Engineering, Vol. 98, pp. 98-109, 2016.
• [3] Murawski, L., Shaft line alignment analysis taking ship construction flexibility and deformations into consideration, Marine Structures, Vol. 18, pp. 62-84, 2005.
• [4] Murawski, L., Statyczno-dynamiczne charakterystyki pracy okrętowych układów napędowych i ich wpływ na drgania konstrukcji kadłubów i nadbudówek statków, Zeszyty Naukowe Instytutu Maszyn Przepływowych Polskiej Akademii Nauk w Gdansku, Nr 542, s. 191, 2006. [5] Simm, A., Wang, Q., Huang, S., Zhao, W., Laser based measurement for the monitoring of shaft misalignment, Measurement, Vol. 87, pp. 104-116, 2016.
• [6] Zienkiewicz, O. C., Taylor, R. L., The Finite Element Method, Vol. 1: The Basis, fifth ed., Butterworth-Heinemann, Oxford 2000.
• [7] Elasto-hydro-dynamic evaluation of main bearing performance, MAN B&W Diesel A/S, Copenhagen 2002.
• [8] Guidance notes on propulsion shafting alignment, American Bureau of Shipping, Houston 2004.
• [9] Shafting alignment for direct coupled low-speed diesel propulsion plants, MAN B&W Diesel A/S, Copenhagen 1995.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).