Work

Integration of Theoretical and Experimental Torsional Vibration Analysis in a Marine Propulsion System with Component Degradation

Year: 2025

Type: article

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.

Source: Applied Sciences

DOI: 10.3390/app152111423

Authors: Quang Dao Vuong, Jiwoong Lee, Jiwoong Lee, Jae-Ung Lee, Jae-Ung Lee

Institution: Korea Maritime and Ocean University

Language: English

Topic: Control Systems in Engineering

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $2,896