Integration of Theoretical and Experimental Torsional Vibration Analysis in a Marine Propulsion System with Component Degradation
Source abstract
Abstract
This study investigates torsional vibration characteristics in an aged coastal car ferry propulsion system using theoretical calculations based on the Matrix method alongside experimental measurements. While the measured torsional vibration at the propeller shaft remained within the limits, it was significantly higher than the calculated values, particularly at the 5th harmonic order excited by engine combustion. Negative torque peaks observed during transient clutch engagement caused gear hammering. Structural vibration analysis identified potential gearbox defects, such as wear or misalignment. Multiple torsional vibration calculation models were developed considering various degrees of degradation of the aged rubber blocks and viscous torsional damper. A model assuming that the damping capacity of damper drops to about 1%, corresponding to the specified values at 125 °C, produced results that closely reproduced the measured vibration characteristics. The finding, confirmed by an actual inspection, identifies viscous oil leakage and deterioration of the damper as the primary cause of excessive vibration. Prompt replacement of the viscous oil is recommended to improve torsional vibration behavior.
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Research context
OpenAlex topics: Mechanical Failure Analysis and Simulation · Ship Hydrodynamics and Maneuverability · Tribology and Lubrication Engineering
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Division of Marine System Engineering, National Korea Maritime and Ocean University, Busan 49112, Republic of Korea
Funding
Development of Autonomous Ship Technology · Ministry of Oceans and Fisheries · Korea Institute of Marine Science & Technology Promotion
References (39)
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