Abstract
The main objective of this paper is to investigate the free surface effect on the acoustic pressure due to unsteady forces of a marine propeller operating in a non-uniform ship wake. These unsteady forces include two components: axial thrust and tangential torque force. In this paper, acoustic pressures at both far and near fields are calculated by the analytic solution of the linear wave equation in time domain and the negative Lloyd Mirror effect is used to simulate a soft free surface. From the computational results, it is found that the dominant direction of the acoustic pressure due to the propeller unsteady thrust, when considering the free surface effect, is shifted about 45 degrees from x-axis in x-y plane. The interference of the acoustic pressure due to the propeller unsteady torque with free surface effect is strongly dependent on the angular position of the field point. Its acoustic field is dominant in y-axis. When the shaft immersion of the propeller is reduced, the interference is generally more obvious.
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