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An estimated angle of attack of a cambered otter board in a bottom trawl using three dimensional position

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수산해양기술연구 (Journal of the Korean Society of Fisheries and Ocean Technology)
한국수산해양기술학회(구 한국어업기술학회) (The Korean Society of Fisheriers and Ocean Technology)
초록

The angle of attack of a cambered otter board in a bottom trawl was estimated using a three-dimensional semi-analytic treatment of a towing cable (warp) system that was applied to the field experiments of a bottom trawl obtained by the Scanmar system. The equilibrium condition of the horizontal component and vertical component of forces was used to the three forces acting on the otter board in the horizontal plane. Those forces were the force on the warp at the bracket, hydrodynamic lift and drag forces on the otter board and the force on the hand rope attached just behind the otter board. Also the equilibrium of moment about the front edge of the otter board was used to find out the angle of attack of the cambered otter board. When the warp length was 120m and 180m long and the towing speed was between 1.23 and 1.90 m/s, the estimated angle of attack of the cambered otter board was ranged between 26.1° and 29.6°, respectively, though the maximum lift force was at the angle of attack 22.6°. The angle of attack of the otter board was tended to increase weakly with the longer length of warp (180 m) at the same towing speed in the experiment.

저자
  • 고광수 | Gwang Su GO
  • 조봉곤 | Bong Kon CHOL
  • 배재현(군산대학교 실습선) | Jae Hyun BAE (Kunsan National University Training Ship, Kunsan, Jeonbuk 573-701, Korea)
  • 조성옥(군산대학교 실습선) | Seong-Ok CHO (Kunsan National University Training Ship, Kunsan, Jeonbuk 573-701, Korea)
  • 원성재(군산대학교 실습선) | Sung-Jae WON (Kunsan National University Training Ship, Kunsan, Jeonbuk 573-701, Korea)
  • 윤홍근(군산대학교 실습선) | Hong Keun YOON (Kunsan National University Training Ship, Kunsan, Jeonbuk 573-701, Korea)
  • 박해훈(군산대학교 실습선) | Hae-Hoon PARK (Kunsan National University Training Ship, Kunsan, Jeonbuk 573-701, Korea) Corresponding author