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Patent Searching and Data


Title:
WAVE CHARACTERISTIC EXTRACTOR
Document Type and Number:
Japanese Patent JPH06273198
Kind Code:
A
Abstract:

PURPOSE: To use as information of steering a ship by obtaining an absolute wave height from a vertical displacement of a bow obtained by a vertical acceleration sensor and an output of a wave height gage, generating its power spectrum, setting a wave direction, obtaining an angle of wave encounter, converting the spectrum into a wave frequency base, and obtaining a significant wave height, a mean frequency.

CONSTITUTION: A bow displacement calculator 3 calculates a vertical displacement of a bow based on a detection signal from a vertical acceleration sensor 1, and an absolute wave height calculator 4 calculates an absolute wave height from outputs of a wave height meter 2 and the calculator 3. A power spectrum calculator 5 stores the output signal of the calculator 4 for a predetermined time, and generates a power spectrum. An angle-of-wave encounter calculator 6 sets a wave direction from a direction of an own ship, and obtains an angle of wave encounter. Thus, a spectrum converter 7 converts the spectrum into a wave frequency base, and a significant wave height, mean wave frequency identifier 8 identifies a significant wave height, a mean wave frequency from the output, and a final calculator 9 calculates a mean wave length, a peak wavelength, and a frequency from the output of the identifier 8.


Inventors:
HASE SATOSHI
MATSUDA KAZUO
Application Number:
JP8152693A
Publication Date:
September 30, 1994
Filing Date:
March 16, 1993
Export Citation:
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Assignee:
MITSUBISHI HEAVY IND LTD
International Classes:
G01D21/00; B63B39/00; G01C13/00; (IPC1-7): G01D21/00; B63B39/00
Attorney, Agent or Firm:
Yoshihiko Iinuma (1 person outside)