USING POWER FLOW MEASUREMENTS TO QUANTIFY GEARBOX NOISE TRANSMISSION TO UNDERWATER VIA A PROPELLER SHAFT

摘要

Measurements of structural power flow have been used to quantify the sound radiation of gearbox generated tones by the wet part of the shaft and by the propeller of a frigate. The whole procedure required structural power flow measurements at sea, inboard transmission measurements on the shaft under quiet conditions and measurements of transmission and radiated sound on a sound range. The applied procedures are described and some details and results of the power flow measurements are discussed. Conclusions are that the measurement of structural power flow on a rotating propeller shaft is practicable and that the use of structural power flow as a path strength descriptor is viable under normal conditions at sea.