Propeller Induced Pressure on Bottom Surface of Stern -A Method of Seperation from the Measured Pressure with Pressure Transducer attached on Hull Surface.

선미선저(船尾船底)에 미치는 추진기(推進器) 유기압력(誘起壓力) -선체표면(船體表面)에 붙인 압력변환기(壓力變換器)로 계측(計測)되는 압력(壓力)으로부터의 한 분리방법(分離方法)-

The propeller induced pressure fluctuation around a ship's stern is one of the interesting problems from viewpoints of the noise and vibration. Most of the experimental works on the subject employ pressure transducer attached on hull surface near the propeller. In the technique, the measured pressure includes the hydrodynamic pressure transducer attached, if they exit. Hence, the separation of the additional pressure due to vibration from the measured pressure is essential for the determination of true values of the propeller induced pressure. In this paper, to contribute to the separation method, the author investigated the additional hydrodynamic pressure as below, based on the numerical calculation. (1) Hydrodynamic pressure on the body surface of two dimensional cylinders of some mathematical sections such as ellipse, rectangle, Lewis form of hypotrocoidal charactor and curvilinear-element section with chines oscillating vertically at high frequency in a free surface. (2) Hydrodynamic pressure on the surface of the shell plate in local vibration in an ideal fluid.