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- W1596110614 abstract "The main objective of this paper is to derive discrete blade rate noise induced by an unsteady sheet cavitation (monopole) and unsteady forces (dipole) of a propeller operating in a nonuniform ship wake. These unsteady forces include two components: axial thrust and tangential torque force. In the present method, an exact analytic solution of the linear wave equation can be derived directly in time domain and then used for calculating acoustic pressure at both far field and near field. From the computational results, it is found that the acoustic pressure at far field, due to the variation in distance between the noise source and the observer, is negligibly small compared with that due to the variation of the noise source strength in time. For computing far-field acoustic pressure, induced by the unsteady sheet cavitation and thrust, noise sources on a blade can be replaced by an effective point noise source. However, in doing so, errors will appear for the computation of the acoustic pressure induced by the unsteady torque force. For the near-field computation, the noise source distribution on the entire propeller blade should be considered, especially for unsteady thrust and torque." @default.
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- W1596110614 date "2004-03-01" @default.
- W1596110614 modified "2023-09-24" @default.
- W1596110614 title "Numerical prediction of the blade rate noise induced by marine propellers" @default.
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