A theoretical investigation of natural frequencies of vibration and noise due to engine and propeller systems of an Ultra Large Crude Carrier (ULCC)

摘要

This paper deals with the study and analysis of the natural frequency ofnvibration and noise from engines and propellers. The effect of length betweennthe perpendiculars (LBP) at the water line and deadweight (Dwt) of ULCC onnthe power requirement to propel the ship has been studied. The effect of servicenspeed of ULCC on the frictional resistance and fuel consumption has also beennstudied and presented. The analysis has been carried out for the propellerndiameter, propeller pitch and in the selection of number of blades to reducenvibration noise. The study of the effects of LBP and Dwt of the ULCC on thenengine and propeller noise has been carried out and presented in the paper. Thenpaper concludes with the comparison of natural frequencies obtained by annanalytical approach with the Finite Element Analysis using Ansys.