Title:
HULL HEAVING REDUCING DEVICE
Document Type and Number:
Japanese Patent JP3127496
Kind Code:
B2
Abstract:
PURPOSE: To improve the safety and efficiency of operation by reducing the heaving of a hull in which the operation is carried out under the stopped condition on the ocean.
CONSTITUTION: Antiheaving tanks 2 are provided on the bow and stern of a hull 1. A duct 6 provided on the sidewall of the antiheaving tank 2 is opened to the lower portion of a side shell plate 3 so that the sea water can freely come in and out of the tank 2. Also, the antiheaving tank 2 is provided on the upper portion with an opening 7 through which air comes in and out. When the hull 1 heaves, the phase of the pitch of the sea water in the tank 2 is adapted to deviate from that of the hull 1, so that large damping force is generated and thereby an opening area A0 of the duct 6 in the pitch of the hull 1 is adjusted by a slide type regulator 8.
Inventors:
Shigemi Usuha
Tetsuya Yasuda
Seiya Yamashita
Tetsuya Yasuda
Seiya Yamashita
Application Number:
JP17777191A
Publication Date:
January 22, 2001
Filing Date:
June 24, 1991
Export Citation:
Assignee:
Ishikawajima Harima Heavy Industries Co., Ltd.
International Classes:
B63B39/03; (IPC1-7): B63B39/03
Domestic Patent References:
| JP60113293U | ||||
| JP61169788U |
Attorney, Agent or Firm:
Mitsuo Sakamoto