A Study for Effort in Changing Propeller Material to CFRP within Fisheries Training Vessel

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  • 漁業実習船におけるプロペラ材質変更の効果に関する研究

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<p>In recent years, ships equipped with marine propellers made of CFRP (Carbon Fiber Reinforced Plastic: hereinafter "CFRP") have been introduced, and the Nagasaki Maru, a fisheries training ship of the Faculty of Fisheries of Nagasaki University, was also replaced with a CFRP propeller during the January 2023 dock. However, there has been little verification of the effects for changing propeller material on an actual ship, so in this study, we compared effects of changing propeller material between metal and CFRP on an actual ship in terms of underwater radiated noise, onboard noise and vibration environment, and fuel consumption. Of these, underwater radiated noise was measured with a small memory hydrophone at a depth of 20 m, and noise and vibration were simultaneously measured at seven locations on board. In addition, fuel consumption was compared in terms of cruising distance per liter. The results showed as follows, ①underwater noise was reduced by an average of 2 dB, ②onboard noise was below the standard value of the IMO Shipboard Code before the conversion, still more noise was further reduced, ③vibration was clearly decreased in the 100-150 Hz, and ④compared in cruising distance per liter of oil of up to more than 40% at research mode.</p>

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