Title:
NET MOUTH INCLINATION KEEPING TYPE TRAWL NET FISHERY SYSTEM
Document Type and Number:
WIPO Patent Application WO/2008/029533
Kind Code:
A1
Abstract:
Provided is a net mouth inclination type trawl net fishery system for controlling
a posture autonomously. The trawl net fishery system comprises a trawl net including
a body portion of a quadrangular pyramid shape formed of an upper net, a lower net
and a pair of side nets, and a cot end portion connected to the leading end of the
quadrangular pyramid shape. In the trawl net, the side net of the body portion
has a longer side and a shorter side as its upper and lower sides, and the sides forming
the net mouth edges such an inclination angle (ν) of the side net front edge
with respect to the bottom side of the a isosceles trapezoid having a shorter leg
as the shorter side as satisfies the relation of the following Formula (1), so
that the front edge of the net mouth is enabled to keep an inclination angle (β)
autonomously by the resistance and lift of a water flow with respect to the net:
(y1CDθ1 - x1CLθ1)S1
+ (y2CDθ2 + x2CLθ2)S2
+ 2ySCDθSSS + 2awfsinβ/(ραV2)
= 0 - - - (1).
Inventors:
HU, Fuxiang (4-2-201, Ettyujima 2-chome Koto-k, Tokyo 44, 1350044, JP)
胡 夫祥 (〒44 東京都江東区越中島２－４－２－２０１ Tokyo, 1350044, JP)
TOKAI, Tadashi (F-1001, 3-45 Kasama, Sakae-ku, Yokohama-sh, Kanagawa 06, 2470006, JP)
東海 正 (〒06 神奈川県横浜市栄区笠間三丁目４５番Ｆ－１００１号 Kanagawa, 2470006, JP)
SHIODE, Daisuke (2-20-203, Ettyujima 2-chome Koto-k, Tokyo 44, 1350044, JP)
胡 夫祥 (〒44 東京都江東区越中島２－４－２－２０１ Tokyo, 1350044, JP)
TOKAI, Tadashi (F-1001, 3-45 Kasama, Sakae-ku, Yokohama-sh, Kanagawa 06, 2470006, JP)
東海 正 (〒06 神奈川県横浜市栄区笠間三丁目４５番Ｆ－１００１号 Kanagawa, 2470006, JP)
SHIODE, Daisuke (2-20-203, Ettyujima 2-chome Koto-k, Tokyo 44, 1350044, JP)
Application Number:
JP2007/057138
Publication Date:
March 13, 2008
Filing Date:
March 30, 2007
Export Citation:
Assignee:
National University Corporation Tokyo University of Marine Science and Technology (5-7 Konan 4-chome, Minato-ku Tokyo, 77, 1088477, JP)
国立大学法人東京海洋大学 (〒77 東京都港区港南４丁目５番７号 Tokyo, 1088477, JP)
HU, Fuxiang (4-2-201, Ettyujima 2-chome Koto-k, Tokyo 44, 1350044, JP)
胡 夫祥 (〒44 東京都江東区越中島２－４－２－２０１ Tokyo, 1350044, JP)
TOKAI, Tadashi (F-1001, 3-45 Kasama, Sakae-ku, Yokohama-sh, Kanagawa 06, 2470006, JP)
東海 正 (〒06 神奈川県横浜市栄区笠間三丁目４５番Ｆ－１００１号 Kanagawa, 2470006, JP)
国立大学法人東京海洋大学 (〒77 東京都港区港南４丁目５番７号 Tokyo, 1088477, JP)
HU, Fuxiang (4-2-201, Ettyujima 2-chome Koto-k, Tokyo 44, 1350044, JP)
胡 夫祥 (〒44 東京都江東区越中島２－４－２－２０１ Tokyo, 1350044, JP)
TOKAI, Tadashi (F-1001, 3-45 Kasama, Sakae-ku, Yokohama-sh, Kanagawa 06, 2470006, JP)
東海 正 (〒06 神奈川県横浜市栄区笠間三丁目４５番Ｆ－１００１号 Kanagawa, 2470006, JP)
International Classes:
A01K73/05; A01K73/00
Attorney, Agent or Firm:
YOSHITAKE, Kenji et al. (Kyowa Patent & Law Office, Room 323 Fuji Bldg.,2-3, Marunouchi 3-chom, Chiyoda-ku Tokyo 05, 1000005, JP)