0.8 1.0 1.2 



Tuning Factor, jv 



Figure 6 — Pitch and Heave Parameters, Cargo Model 1 



The natural periods for both the pitching and heaving oscillations are obtained from 

 Kreitner's approximation,' given as 



r„=r^ 



+ 10 5 



where H is the maximum draft, and 



B is the waterline beam at midships. 



The approximation has been found to agree fairly well with experimental heave period meas- 

 urements. It is used here for ease of application, and for consistency among the different 

 models. 



The frequency response curves of Figures 6 through 9 show the same general shapes 

 and trends for all the models. This is shown more clearly when the results for all models 

 are plotted on a single graph, as in the examples given in Figure 10. In general, the curves 

 indicate higher response amplitudes for the full models as compared with the fine forms. 



