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Study on the Propeller Rope Cutter Concerning Transient Torsional Vibration Due to Cutting Action

Authors :
Woo-Seok Kwon
Quang Dao Vuong
Jae-Hyuk Choi
Jae-ung Lee
Ji-woong Lee
Sung Hwan Yoon
Antony John Nyongesa
Min-Ho Park
Seung-Kwon Yang
Won-Ju Lee
Source :
Applied Sciences, Vol 12, Iss 3, p 1628 (2022)
Publication Year :
2022
Publisher :
MDPI AG, 2022.

Abstract

Nowadays, damage to ships due to marine debris at sea is increasingly reported. Specifically, a piece of rope or fishing net can wrap around the propeller shaft, stopping it from rotating. Although various efforts have been made, there are still numerous practical challenges. A rope cutter system, which was designed to cut suspended objects wrapped around the propeller shaft, offers a great advantage in protecting the propulsion system. Since the cutting action produces the transient torsional vibration, the connecting bolts should be stable and sufficiently rigid under normal conditions. However, in the event of an encounter with an object that is too hard to cut, the bolts must be broken so that the rope cutter is released. Those kinds of objects may not be long enough to wrap around the shaft, such as a piece of wood. Therefore, this research presents the novelty in maintaining the safety of the propulsion system installed with a rope cutter. In this study, a method for obtaining the maximum diameter of the connecting bolt as a safety device is described, and the torques required to cut ropes of various thicknesses were determined based on actual measurements. Finally, a series of experiments in the laboratory-scale and shipboard test on an actual ship show that the rope cutter does not significantly reduce the ship’s power performance or increase the structural vibration.

Details

Language :
English
ISSN :
20763417
Volume :
12
Issue :
3
Database :
Directory of Open Access Journals
Journal :
Applied Sciences
Publication Type :
Academic Journal
Accession number :
edsdoj.b510f3192c7440e88ccf530188a8508a
Document Type :
article
Full Text :
https://doi.org/10.3390/app12031628