수중방사소음 예측을 위한 선체 접수판의 가속도 분포에 관한 연구

Abstract

In order to manage a ship’s underwater radiated noise, it is necessary to monitor it through a sensor attached to the hull. The underwater radiated noise can be predicted using the acceleration levels and radiation efficiency of the submerged plate. The areas of submerged plates are too large to be covered by a limited number of sensors. Moreover, some areas are inaccessible due to the tank structure on the bottom of ship. For accurate noise prediction, numerical calculations and measurements are used to investigate the appropriate number and locations of accelerometers. Numerical analysis shows that the vibration level changes sensitively with position. The acceleration levels obtained by all submerged plates are different from those by submerged side wall plates only. This means that the sensor location should be chosen so that errors are minimized when predicting under-water radiated noise. Vibration distribution is studied by measurement. Owing to the constraint of the number of channels, only the longitudinal distribution is investigated. Acceleration has different levels depending on location and frequency. Appropriate numbers and positions are suggested to represent the acceleration level of the entire submerged plate.