Development of an Experimental Methodology for Self-Propulsion Test with a Marine Diesel Engine Simulator, Third Report – Auxiliary Thruster System -

摘要

The experimental methodology for Self-Propulsion test with a MDESrn(Marine Diesel Engine Simulator) is expanded by a newly developedrnAuxiliary Thruster System. The MDES controls propeller rotationalrnspeed, by measured propeller torque and rotational speed itself asrninputs, with control algorithm reflecting the marine diesel enginerncharacteristics. Here, with auxiliary and adjustable force equaling tornSkin Friction Correction on a model ship even in free runningrnexperiment, we can make propeller loading condition of model shiprncorresponded to that of actual ship at same Froude number. Authorsrndeveloped an Auxiliary Thruster System (hereafter, ATS) whosernthrust force is controllable. Then, adding the force equaling to SkinrnFriction Correction by the ATS, the experimental methodology withrnthe MDES will be upgraded, because propeller torque input to thernMDES are greatly approached to that corresponding in actual ship. Inrnthis study, free running model experiment in waves using the MDESrnand ATS were conducted, and there are significant differencesrnbetween the results with and without the ATS. Furthermore, a problemrnon the methodology with the MDES and ATS are discussed.