Article ID Journal Published Year Pages File Type
768229 Engineering Failure Analysis 2016 13 Pages PDF
Abstract

•Torsional vibration is estimated with calculation according to the variation of the system parameters.•Vibratory torque is measured with shear strain gauge and telemetry system.•Base on the measurement and calculation, the main parameter is identified to increase torsional vibration.

Since torsional vibration can lead to fatigue failure of the propulsion shaft in a ship, it should be restricted from the first step of the design through calculation and verified at the sea trial test step through measurement. Considering that the torsional vibration of the shaft is a system characteristic, it is strongly related to the vibration modes at the natural frequencies of the shaft. Therefore, the actual torsional vibration problem can occur due to the variation of parameters such as those of the vibration system, including mass of inertia, damping, and stiffness, which differ from the design.In this research, the root cause analysis of the high torsional vibration which occurred in the actual ship is described through a parametric study performed using numerical analysis. Parameters that can increase the torsional vibration of the propulsion shaft are selected, including coupling stiffness, shaft stiffness, coupling damping, and shaft damping. Through the torsional vibration calculations with variations of these parameters, the extent of the effect of these parameters on the torsional vibration of the propulsion shaft is investigated and the cause of the increased torsional vibration is identified.

Related Topics
Physical Sciences and Engineering Engineering Industrial and Manufacturing Engineering
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