Ship K with ballast even keel condition at 10/10 zigzag test is shown in Fig. 14 and at 20/20 zigzag test is shown in Fig.15. There seems good agreement between predicted and measured results, including the shape of the curve.

　

 Fig.16 and Fig.17 are predicted and measured results in the case of higher speed condition at Fn=0.156, as for Ship E with ballast 1% trim condition. Fig.16 and Fig.17 are same condition with Fig.2(iii) and Fig.3(iii) at Fn=0.059, except Fn. It seems that numerical simulations can represent the difference of the initial ship speed well.

 Fig.18 shows the results of different ship speed. Fig.18(a) shows the initial speed has much effect on advance. Fig.18(c) shows the initial speed has much effect on the first overshoot angle in zigzag motion.

　

 We proposed approximate formulae for estimating the coefficients of hydrodynamic forces acting on ship. According to numerical simulation by using the approximate formulae, close agreement between calculated and measured results was obtained. The approximate formulae would be useful to predict manoeuvring performance at the design stage from practical points of view.

　

[1] Kijima, K., Katsuno, T., Nakiri, Y. and Furukawa, Y., "On the Manoeuvring Performance of a Ship with the Parameter of Loading Condition", Journal of the Society of Naval Architects of Japan, Vol.168, pp.141-148, 1990

[2] Kijima, K., Nakiri, Y., Furukawa, Y., Hori, T. and Aoki, I., "On a Study for Influence of Loading Condition on a Prediction of Ship Manoeuvrability", Transaction of West-Japan Society of Naval Architects, No.89, pp.155-166, 1995 (In Japanese).

[3] Mori, M., "A Note on Hull Form Design (Part 24)", Journal of Ship Science, Vol.48, pp.40-49, 1995 (In Japanese).

[4] Yoshimura, Y., Ishiguro, T. and Tanaka, S., "A Study on the Accuracy of the Recent Prediction Technique of Ship's Manoeuvrability", Proceedings of MARSIM '96,pp.547-561, 1996

　

Katsuro KIJIMA

1967　Bachelor of Naval architecture in Kyushu University

1969　Master of Naval architecture in Kyushu University

1972　Lecturer in Kyushu University

1974　Doctor of Naval architecture Assistant professor in Kyushu University

1986　Professor in Kyushu University

1987-1996　Member of ITTC Manoeuvring Committee

1993　Chairman of IMO DE Ad. working group

1993-1996　Chairman of ITTC Manoeuvrability Committee

1999-2003　President of West Japan Society of Naval Architects

2002-2003　Chairman of JTTC

　

Yasuaki NAKIRI