The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 07, 1999
Filed:
Jul. 16, 1998
Toshio Yoshida, Suma-Ku, Kobe-Shi, Hyogo-Ken, JP;
Other;
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'.