The free vibration of a rudder is studied here by theoretical, numerical, and experimental means. The rudder is modeled as a Kirchhoff’s plate, with chord-wise sections as symmetrical aerofoils of NACA0018 section. The free vibration is also studied numerically. The results have been compared with experimental studies. A model scale rudder has been constructed from a 3 mm thick metal sheet, with a length-scale ratio of 1:10. Impact hammer test has been down to excite all the natural frequencies, which have been picked up by two accelerometers into an FFT analyzer. Comparative studies have been done among the three methods.

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