Abstract
The marine propellers installed at the rear of ships experience the cavitation phenomenon, producing vibratory hull-excitations at several orders of blade passing frequency. The current investigation establishes a practical design method of multi air-balloons to suppress the propeller cavitation-induced excitation at multiple frequencies. The theoretical formulation begins with the existing modal series solution of a multiple scattering problem. We propose an approximated solution in a low-frequency system that is useful in the analysis and design stages. The parametric variation of the separation distance between the balloons reveals a rational proof that their mutual interaction can be ignored unless they are too close together. Therefore, it is emphasized that each balloon can be designed individually without reflection of the coupling characteristics among them.
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