船体縦運動における過渡応答法による船型試験

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Forced oscillation test, wave exciting forces test with the restrained model and ship model motion experiment are the well known experiment techniques to obtain the hydrodynamical forces acted on a ship with forward speed and it's motions in waves. The authors carried out three kinds of experiments as follows, mainly using transient input signals (transient forced heave and transient water wave), and also did with sinusoidal signals to check it's property. (a) Transient forced pure heave test in still water (b) Wave exciting force test in transient water wave (c) Ship model motion experiment in transient water wave Moreover, the comparison between the experimental values and the calculated values by Ordinary Strip Method was made in detail. The authors could come to the next conclusions from the above test results. (1) Within the limit of linearity, the frequency transfer functions in respect to Exp. (a) and (b) are given as the stationary responses from the transient responses. (2) Calculated heave amplitudes by experimental values Exp. (a) and (b) coincide fairly good with the measured values Exp. (c). (3) Oscillating forces, wave exciting forces, ship motion and etc. also coincide with the calculated values by O.S.M. with a practical accuracy. Then it is certified under the linearity that the transient response method is the useful one for research on ship's behaviors in waves. Concerning about the experiment techniques, transient forced oscillation test, wave exciting force test and ship model motion experiment in transient water wave were proved to be the useful practical methods. The authors hope that testing ship models by transient response method will be put to practical use in model basins.
社団法人日本船舶海洋工学会の論文

船体縦運動における過渡応答法による船型試験

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