抄録
Sound power evaluation methods are investigated numerically and experimentally. Sound measurement in ship's engine room is under very inferior condition because the engine is installed in such a small place. There are two methods to evaluate sound power; sound pressure based method and sound intensity method. The investigation shows that the former method has a inferiority in the precision, especially in the decision of environment correction factor, and the latter method is not practical for a large marine engine. As a result, the hybrid method which has both precision and practicality is proposed.
