Ships – Displacement-type hull – Multiple hulls
Patent
1998-07-16
1999-09-07
Avila, Stephen
Ships
Displacement-type hull
Multiple hulls
114 6114, B63B 100
Patent
active
059470461
ABSTRACT:
What prevents high-speed navigation of a large-scale high speed ship in waves is ship oscillation. The concept of the invention has been derived from an idea to control a ship oscillationless longitudinally with small-size fins by providing the ship with struts being formed to have a value of longitudinal metacentric height such that the value of statical restoring moment due to the longitudinal metacentric height ("self-stability moment") does not exceed the value of Munk's instability moment ("Munk moment"). Therefore, a residual Munk moment of negative value as the sum of "Self-stability moment" having a positive value and "Munk moment" having a negative value, is reserved. The ship is characterized by using the controlling effects of the control fin besides designing the strut by taking into account the self-stability moment and the Munk moment. The invention can cause a ship to navigate stably at high speed in waves while easily controlling the longitudinal oscillation by small fins due to the reserving of the residual "Munk moment".
REFERENCES:
patent: 4557211 (1985-12-01), Schmidt
patent: 4763596 (1988-08-01), Yoshida
patent: 4802428 (1989-02-01), Lang
patent: 4986204 (1991-01-01), Yoshida
patent: 5263427 (1993-11-01), Yamamoto et al.
patent: 5265549 (1993-11-01), Cernier
patent: 5529009 (1996-06-01), Faury et al.
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