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Article

Self-Excited Torsional Vibration in the Flexible Coupling of a Marine Propulsion Shafting System Employing Cardan Shafts

by
Myeong-Ho Song
1,
Taek-Kun Nam
1 and
Jae-ung Lee
2,*
1
Division of Marine Engineering, Mokpo National Maritime University, Mokpo 58628, Korea
2
Division of Marine Information Technology, Korea Maritime and Ocean University, Busan 49112, Korea
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2020, 8(5), 348; https://doi.org/10.3390/jmse8050348
Submission received: 21 April 2020 / Revised: 3 May 2020 / Accepted: 7 May 2020 / Published: 13 May 2020
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Abstract

The reliability of propulsion shafting systems is a major concern for ocean-going vessels because mid-ocean repairs can be time-consuming and spare parts must be available. To address this concern, vibration modeling and experimental measurements were conducted on a propulsion shafting system with a Z-drive propeller, with the objective of identifying the source of failure for the flexible rubber coupling connecting the diesel engine with the intermediate shaft. The torsional fluctuations in the flexible coupling dramatically increased and then abruptly ceased. The modeling results revealed that the frictional losses during power transmission through the universal joints could act as an excitation force for self-excited vibration. The coupling connected to the intermediate shaft did not have sufficient radial flexibility to dampen these vibrations. To avoid the effects of the self-excited torsional vibration, it is recommended that this coupling is replaced with one that is capable of absorbing the radial shaft displacement.
Keywords: Z-drive propeller; Cardan shaft; self-excited torsional vibration; flexible coupling; flexible link; frictional torque Z-drive propeller; Cardan shaft; self-excited torsional vibration; flexible coupling; flexible link; frictional torque

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MDPI and ACS Style

Song, M.-H.; Nam, T.-K.; Lee, J.-u. Self-Excited Torsional Vibration in the Flexible Coupling of a Marine Propulsion Shafting System Employing Cardan Shafts. J. Mar. Sci. Eng. 2020, 8, 348. https://doi.org/10.3390/jmse8050348

AMA Style

Song M-H, Nam T-K, Lee J-u. Self-Excited Torsional Vibration in the Flexible Coupling of a Marine Propulsion Shafting System Employing Cardan Shafts. Journal of Marine Science and Engineering. 2020; 8(5):348. https://doi.org/10.3390/jmse8050348

Chicago/Turabian Style

Song, Myeong-Ho, Taek-Kun Nam, and Jae-ung Lee. 2020. "Self-Excited Torsional Vibration in the Flexible Coupling of a Marine Propulsion Shafting System Employing Cardan Shafts" Journal of Marine Science and Engineering 8, no. 5: 348. https://doi.org/10.3390/jmse8050348

APA Style

Song, M.-H., Nam, T.-K., & Lee, J.-u. (2020). Self-Excited Torsional Vibration in the Flexible Coupling of a Marine Propulsion Shafting System Employing Cardan Shafts. Journal of Marine Science and Engineering, 8(5), 348. https://doi.org/10.3390/jmse8050348

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