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Fig.6 The Comparison of N'r
In statistical analysis for the regression formulae of hydrodynamic coefficients, various kinds of ship (tanker, product the model test results of tanker, product carrier, bulk carrier, container carrier, LNG carrier, etc.) and some of results at ballast conditions are included. In Fig. 7 and 8, ship-types and loading conditions used in the analysis are shown.
Fig.7 Ship-types used in Analysis
Fig.8 Loading Conditions used in Analysis
Most PMM tests were carried out at full load condition but nine ships were carried out at ballast draft condition. The ranges of ship particulars used in the analysis are given below.
Cb:0.55〜0.87
d/L:0.022〜0.071
L/B:5.0〜8.8
CbB/L:0.075〜0.166
From the statistical analysis, the empirical formulae of hydrodynamic coefficients are given below.
where
PSR=28.7∇'+0.54
SR=BP07/BPS
ΔB/L=ΔCb=ΔSR=0 for ballast condition.
SR:stern hull form coefficient
BPS:half breadth at the height of propeller shaft in 2.0 station
BP07:half breadth at the height of 0.7R(propeller radius) in 2.0 station
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