Shaft line alignment analysis taking ship construction flexibility and deformations into consideration

Murawski, Lech

doi:10.1016/j.marstruc.2005.05.002

Cited by 86 publications

(40 citation statements)

References 3 publications

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“…3. Area of all propulsion systems bearings' foundation was distinguished and loaded by unitary pressure [15]. Displacements of the bearings give me the value of the ship hull local stiffness.…”

Section: Model Verificationmentioning

confidence: 99%

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Thermal Displacement of Crankshaft Axis of Slow-Speed Marine Engine

Murawski

2016

Brod

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UDC 629.5(05):621. 436 Original scientific paper SummaryThe paper presents analysis of displacement of a crankshaft axis caused by temperature of marine, slow-speed main engine. Information of thermal displacement of a power transmission system axis is significant during a shaft line alignment and a crankshaft springing analysis. Warmed-up main engine is a source of deformations of an engine body as well as a ship hull in the area of an engine room and hence axis of a crankshaft and a shaftline. Engines' producers recommend the model of parallel displacement of the crankshaft axis under the influence of an engine heat. The model gives us the value (one number!) of the crankshaft axis displacement in the hot propulsion system's condition. This model may be too simple in some cases. Presented numerical analyses are based on temperature measurements of the main engine body and the ship hull during a sea voyage. The paper presents computations of MAN B&W K98MC type engine (power: 40000 kW, revolutions: 94 rpm) mounted on 4500 TEU container ship (length: 290 m). Propulsion system is working in nominal, steady-state conditions; it is the basic assumption during the analyses. Numerical analyses were preformed with usage of Nastran software based on Finite Element Method. The FEM model of the engine body comprised over 800 thousand degree of freedom. Stiffness of the ship hull (mainly double bottom) with the foundation was modelled by a simple cuboid. Material properties of that cuboid were determined on the base of separately performed calculations.

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Section: Model Verificationmentioning

confidence: 99%

“…Influence of crankshaft axis thermal deformation on shaft line alignment was analysed with usage of author's specialized software [15,16]. The software is based on finite element method.…”

Section: Influence Of Crankshaft Axis Thermal Deformation On Shaft LImentioning

confidence: 99%

Thermal Displacement of Crankshaft Axis of Slow-Speed Marine Engine

Murawski

2016

Brod

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“…A study of the shaft line alignment with hull deformations was taken by Murawski [11]. Different loading conditions in the dead water were calculated in his word while the dynamic influence of waves on propulsion system should be considered during the ship's operations.…”

Section: Introductionmentioning

confidence: 99%

Vibration characteristics analysis on ship propulsion system taking hull deformations into account

Tian¹,

Yan²,

Zhang³

et al. 2016

Teh. vjesn.

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Original scientific paperSince an evident tendency of the shipbuilding is that the sizes of ships are larger and larger, the dynamic interactions between the propulsion system and ship hull in large scale ships are much severer than those of the small sized ships. Ship hull deformations caused by the action of heavy excited wave forces could affect the vibration characteristics of the propulsion system through bearings mounted on the ships. The reliability and safety of the propulsion system would be in a dangerous condition. In this paper, a novel simplified hull-propulsion system mathematical model is presented to investigate the dynamic interactions between the ship propulsion and hull deformations. Ship hull deformations were obtained as the excited forces under different sea conditions by numerical analysis. Then, based on the gained hull deformations, variable parameters involving stiffness of support bearings are considered on the vibration characteristics of propulsion. The findings of this work may provide a new insight to keep economy and security in both shipbuilding and ship operation fields. Keywords: hull-propulsion system interactions; marine propulsion system; variable parameters; vibration behaviour Analiza značajki vibracija na brodskom porivnom sustavu uzimajući u obzir deformacije trupa brodaIzvorni znanstveni članak Budući da je u brodogradnji očita tendencija izgradnje sve većih brodova, dinamičke interakcije između porivnog sustava i trupa mnogo su oštrije kod velikih nego kod malih brodova. Deformacije brodskog trupa izazvane jakim silama valova mogle bi utjecati na značajke vibracija porivnog sustava preko ležajeva postavljenih na brodu. Pouzdanost i sigurnost porivnog sustava bila bi u opasnosti. U ovom se radu predstavlja matematički model novog pojednostavljenog porivnog sustava u svrhu istraživanja dinamičkih interakcija između brodskog porivnog sustava i deformacija trupa. Deformacije brodskog trupa dobivene su numeričkom analizom kao uzbudne sile pri različitim morskim uvjetima. Zatim su se, na temelju dobivenih deformacija trupa, razmotrili različiti parametri koji su uključivali krutost nosača ležaja u odnosu na karakteristike vibracija porivnog sustava. Rezultati ovoga rada mogu doprinijeti ekonomičnosti i sigurnosti u izgradnji i pogonu brodova. Ključne riječi: brodski porivni sustav; interakcije trup-porivni sustav; ponašanje vibracija; varijabilni parametri

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“…Scholars such as Lech Murawski, Xing, Figureari, Wang, Zhou have been done many works on the interaction between the shaft alignment and ship hull deformations. Longitudinal vibrations of a propulsion system taking the coupling and boundary conditions into considerations have been studied by Lech Murawski [4]. Xing [5] uses finite element models and substructure approaches to analyze the coupled fluid-soild interactions.…”

Section: Introductionmentioning

confidence: 99%