Analysis of the effect of engine rotation on vibration amplitude in the engine room of aluminum ship

Abstract

MV Penguin Redeem catamaran is a fast passenger ship made of aluminum with an asymmetrical hull that has been modified while still using the old engine. Work of the main engine influences vibrations that occur in the engine room area. The transmitted excitation force depends on the stiffness of the supporting structure. Variations in engine speeds of 500 and 1000, 1500, and 2300 rpm are used to see the ability of the supporting structure to receive the excitation force. This study aims to analyze the effect of engine speed with variations of 500, 1000, 1500, and 2300 rpm and the excitation force on the amplitude value to describe the impact of vibration on construction elements as a support in the engine room without additional load on it. The method used in this analysis is calculation and simulation using Ansys through model analysis and harmonic response analysis. This study indicates that the 1000 and 1500 rotations in the wrang area have the most significant amplitude value with a frequency ratio value of 0.5 to 0.7. The support structure above cannot accept the excitation force acting on this rotation in the vertical vibration direction. While in the horizontal vibration direction, the support structure can receive all the excitation forces from the main engine work.