NOTES ON SHIP MODEL TESTING IN TRANSIENT WAVES.
Research and development rept.,
NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER WASHINGTON D C HYDROMECHANICS LAB
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Ship model experiments were conducted to evaluate the accuracy of motion transfer functions obtained by means of the transient wave technique. Since such an evaluation was especially needed for higher ship speeds, Froude numbers up to 0.35 were investigated. Also studied was the feasibility of measuring the incoming wave train far ahead of the model, where distortion of the forcing function by model-generated waves cannot occur. Further, in the interest of reducing computer usage time, the effect of sampling rate on the analysis of analog signals obtained during transient wave tests was examined. Results are also presented which demonstrate a need for smoothing the raw spectra obtained from the computation of Fourier transformations, in order to provide consistently useful transfer functions. Author
- Test Facilities, Equipment and Methods