Research Papers: Internal Combustion Engines

Three-Dimensional Vibration of the Crankshaft of a Large Marine Diesel Engine Under a Mixed Thermo-Elastic-Hydro-Dynamic Lubrication Coupling Between Flexible Crankshaft and Engine Block

[+] Author and Article Information
Lidui Wei

Merchant Marine College,
Shanghai Maritime University,
1550 Haigang Avenue,
Shanghai 201306, China
e-mail: weilidui@163.com

Haijun Wei

Merchant Marine College,
Shanghai Maritime University,
1550 Haigang Avenue,
Shanghai 201306, China
e-mail: hjwei@shmtu.edu.cn

Haiping Du

School of Electrical, Computer
and Telecommunications Engineering,
University of Wollongong,
Northfields Avenue,
Wollongong 2552, NSW, Australia
e-mail: haipingduuow@gmail.com

Shulin Duan

Marine Engineering College,
Dalian Maritime University,
1 Linghai Road,
Dalian 116026, China
e-mail: oliverduan@163.com

1Corresponding author.

Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received January 15, 2017; final manuscript received September 8, 2017; published online January 23, 2018. Assoc. Editor: Philip Bonello.

J. Eng. Gas Turbines Power 140(6), 062802 (Jan 23, 2018) (10 pages) Paper No: GTP-17-1018; doi: 10.1115/1.4038457 History: Received January 15, 2017; Revised September 08, 2017

To predict the vibration characteristics of the crankshaft of the larger marine diesel engine accurately and comprehensively, based on the finite element models of the crankshaft and the engine block reduced by a component mode synthesis (CMS) method as well as extended Reynolds equation and Greenwood-Tripp theory, a mixed thermo-elasto-hydro-dynamic lubrication coupling model between a whole flexible engine block and a rotating flexible crankshaft is set up. According to this strongly coupled nonlinear model, the torsional-axial-lateral three-dimensional (3D) vibration of the crankshaft can be calculated simultaneously. The method is verified through comparison with other computational methods. Also, the vibrations are compared under different support models and whether to consider the effect of temperature. Specific 3D vibrations are displayed, and some stage nonlinear characteristics are shown in 3D direction. The modeling method will contribute to reveal the vibration mechanism and optimize the design of the shafting system.

Copyright © 2018 by ASME
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Fig. 1

Notation of the flexible engine block and the flexible crankshaft interaction

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Fig. 2

Flow chart of the calculation

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Fig. 3

The engine block and the crankshaft

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Fig. 4

Loads at the crankshaft pins (at 127 r/min)

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Fig. 5

Comparison of 3D vibration of free end of the crankshaft

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Fig. 6

Vibration comparison of the free end between the whole flexible and the simply engine block model at 127 r/min. Case 1: not considering the whole engine block flexibility and case 2: considering the whole engine block flexibility.

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Fig. 7

Vibration comparison of the free end between the whole engine block models with or without the temperature effect at 127 r/min. Case 3: not considering the temperature effect and case 4: considering the temperature effect.

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Fig. 8

Comparison of oil film thickness and contact percentage between the models with or without the temperature effect at 127 r/min. Case 3: not considering the temperature effect and case 4: considering the temperature effect; (a, b) for the No.2 bearing and (c, d) for the No.6 bearing.

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Fig. 9

Comparisons of vibration velocity [r. m. s] between the models with or without the temperature effect at different revolution. Case 3: not considering the temperature effect and case 4: considering the temperature effect.

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Fig. 10

(a) Sketch map of axial vibration of crankshaft central points within a cycle and (b) the crankshaft model

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Fig. 11

Torsional vibration of all central points within a cycle

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Fig. 12

The whole bending vibration of the crankshaft



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