Figure 9 |
comparison between estimated and measured values of performance indices |
(a) Advance/L
(b) Tactical Diameter/L
(c) Track Reach/L
(d) 1st Overshoot Angle (deg)
(10°Z)
(e) 2nd Overshoot Angle (deg)
(10°Z)
(f) 1st Overshoot Angle (deg)
(20°Z)
The indices of turning ability are advance and tactical diameter in turning test and they are related to manoeuvring index K'. Then approximate formulae for advance AD and tactical diameter DT are derived from K',
where l'v = N'v/Y'v and b0 - b3 are coefficients shown in Table 1.
Figure 9 shows comparison between predicted performance indices using equations (10) & (12) and measured performance indices obtained by sea trials. It is observed that every performance index is predicted fairly well using the approximate formulae.
5 CONCLUSIONS
Prediction methods for ship manoeuvrability based on a hydrodynamic mathematical model were shown from the view points of practical utilization at the design stage. There are many ways to predict manoeuvring characteristics and each method has its merits and demerits. As for one method, it is been of practical use already and another method is going to be put to practical use soon aiming to improve the accuracy of prediction.
It is also important as mentioned above to establish precise measurement method in sea trials and the evaluation method of the influence of external disturbances. Sea trial data which are measured precisely are required to validate and improve prediction methods for ship manoeuvring performance.
REFERENCES
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[2] Fuwa, K.: "Hydrodynamic Forces Acting on a Ship in Oblique Towing", Jour. of the Soc. of Naval Architects of Japan, Vol.134, pp,135-147 (1973) (in Japanese).
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AUTHOR'S BIOGRAPHY
K. Kijima graduated from Kyushu University. Japan in 1967 and received his Doctor of Engineering degree from Kyushu University in 1974. Presently employed as Professor of the Department of Marine Systems Engineering, Kyushu University. His main research interests are prediction of ship manoeuvrability and automatic ship navigation system.
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