The influence of shaft line alignment accuracy on the operational reliability of marine propulsion systems

• Autorzy: Murawski L.

Identyfikatory

DOI

10.5604/12314005.1213580

• Języki publikacji: EN

Abstrakty

EN

The paper presents a method of identification parameters of shaft line alignment and its influence on operational reliability of marine propulsion system. The discussion about shaft line parameters (bearings' reactions, bending moment and shear forces acting on crankshaft or gear box, and stresses distribution in the shaft line) which has an influence on marine propulsion system reliability was presented. Proper shaft line alignment is often a problem for repair shipyards, for aged ships without sufficient documentation. Some data can be draw by measurements; e.g. shaft line dimensions or intermediate bearings' reactions. Other data (stern tube bearing load, real axis of shaft line) have to be determined on the base of calculations. Author proposed combined experimental-analytical method for identified and optimization (correction) some existing parameters and checking power transmission system’s foundation. Specialised software (based on Finite Element Method) has been developed for shaft line alignment calculations. Main novelties of the software are elastic supports (model of bearings – boundary conditions) of the shaft line, continuous support as a model of stern tube bearing and influence coefficients calculations. An example analysis with discussion has been performed for cargo ships with medium-speed main engine. Multi-variant computations supported by measurements of the ships’ shaft line have been carried out. Changes in shaft line alignment have been proposed in order to increase reliability of propulsion system.

Słowa kluczowe

EN

shaft line alignment; marine propulsion systems; propulsion system's bearings damages; operating parameters of the power transmission 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: 2016
• Tom: Vol. 23, No. 1
• Strony: 247--254
• Opis fizyczny: Bibliogr. 10 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] Charchalis, A., Grządziela, A., Diagnosing the shafting of alignment by means vibration measurement, ICSV Congress (electronic ver.), Garmisch-Partenkirchen 2000.
• [2] Cowper, B., DaCosta, A., Bobyn, S., Shaft alignment using strain gauges, Marine Technology, Vol. 36, No. 2, pp. 77-91, 1999.
• [3] Lowa, K. H., Limb, S. H., Propulsion shaft alignment method and analysis for surface crafts, Advances in Engineering Software, Vol. 35, pp. 45-58, 2004.
• [4] Murawski, L., Shaft line alignment analysis taking ship construction flexibility and deformations into consideration, Marine Structures, No. 1, Vol. 18, pp. 62-84, 2005.
• [5] 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 Gdańsku, Nr 542/1501/2006, 191 str., Gdansk 2006.
• [6] Murawski, L., Identification of shaft line alignment with insufficient data availability, Polish Maritime Research, No. 1(59), Vol. 16, pp. 35-42, 2009.
• [7] Redmond, I., Study of a misaligned flexibly coupled shaft stem having nonlinear bearings and cyclic coupling stiffness – Theoretical model and analysis, Journal of Sound and Vibration, Vol. 329, pp. 700-720, 2010.
• [8] Zhang, S., Yang, J., Li, Y., Li, J., Identification of bearing load by three section strain gauge method: Theoretical and experimental research, Measurement, Vol. 46, pp. 3968-3975, 2013.
• [9] Zienkiewicz, O. C., Taylor, I. R. L., The Finite Element Method, Fourth edition, V. 1/2. McGraw-Hill, London 1992.
• [10] Shafting Alignment for Direct Coupled Low-Speed Diesel Propulsion Plants, MAN B&W Diesel A/S, Copenhagen 1995.

Uwagi

PL

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