STRENGTH ANALYSIS OF PROPELLER SHAFTING ON ORCA CLASS FISHERIES INSPECTION BOAT USING FINITE ELEMENT METHOD

Propeller shafting system is machinery elements which important for ship propulsion. The function of propeller shafting is to distribute the power from the main engine or main gearbox to shaft propeller. The rigid coupling system is a type of shafting system which is simpler and most used in ship machinery. The disadvantage of this coupling is not permiting any misaligned in the mids of coupling to shaft end and cannot reduce the transmission impact. The torsion that taken out by main engine will be causing failure or breaking the coupling, particularly on key and bolt. Damage in coupling is a major problem because the main engine cannot distribute the power to the propeller. Thus, the ship cannot be able to move. The goal of this investigation is known the proper material with considering the yield strength of materials. Finite Element Method is a numerical simulation which not needed a real test. Contact mechanics are considered for the bearing frictions which the shaft using the water-lubricated seal, which required a durable material against corrosion. According to the results, the maximum stress which is obtained located on keyway element when maximum continuous rating condition. This condition should be damaged the shaft and key Meanwhile the maximum stress which is obtained under 75% of engine rating condition was in safety limit. Thus, UNS 41600 is a superior choice for aluminum used parts