Fatigue Analysis in Ship Engine Bed Construction Due to Engine Vibration Using the Finite Element Method (FEM), Study Case Of Labritha Karina Ship

Abstract

 The engine bed structure on a ship plays a crucial role in supporting the main engine and damping vibrations generated during operation. The Labritha Karina vessel underwent a propulsion system modification, requiring a redesign of the engine bed. This study aims to analyze the structural strength and fatigue life of the engine bed under dynamic vibrations using the Finite Element Method (FEM). The geometry of the engine bed was modeled using SolidWorks software and analyzed with Ansys. The analysis results show that the maximum stress is 35.69 MPa, which is below the allowable stress limit of 235 MPa. The maximum deformation is recorded at 1.353 mm, with a safety factor of 6.58, indicating that the engine bed structure is structurally reliable. The fatigue simulation revealed that the fatigue life of the engine bed is approximately 25,96 years, excluding damping factors and the use of mounting pads.

Index terms —Fatigue; Engine Bed; Vibration; Finite Element Method (FEM); Ansys.