Estimation of the Virtual Mass of Conical Nets using Circulating Water Channel

회류수조를 이요한 자루그물의 가상질량 추정

  • 김현영 (부경대학교)
  • Published : 2000.02.01

Abstract

The virtual mass of net is an important parameter in the analysis and control of net movement in the water. This experiment was performed with the purpose of getting a relation on the quantity of netting and virtual mass of trawl nets using the circulating water channel that can control flow speed. Twelve types of conical nets were examined. Resistance of the conical net at the steady and acceleration state was recorded as text on the personal computer through the tension meter and current meter. The results were obtained as follows ;1. Resistance(R) of the conical net is proportional to the degree of attack angle in the sam e amount of twine material.2. Coefficient of the resistance(Cd)could be defined by the following regression model as a function of Reynolds Number(Re). Cd=0.039Re-0.14743. Resistance(R) is proportional to TSA(Twine surface area) and defined as follows; R=21.398TSA-0.12194. Coefficient of virtual mass(CM) could be calculated by the following first order regression model. CM=37.557U-8.96845. Virtual mass is directly proportional to Volume of net(V) or d/l.

Keywords

References

  1. Nippon Suisan Fakkaishi v.52 The virtual mass of Plane Nets Yamane, T.;Iitake, Y.
  2. Calculations For Fishing Gear Design Fridman, A. L. Tech Sc
  3. 海洋技術者のための流れ學 宇野木早苗(외3명),
  4. 유체역학 노병준;조원일
  5. Fishierises Engineering v.31 no.1 圓錐形袋綱의 附加質量 胡 夫祥;松田 皎;山越 康行;東海 正
  6. 한국수산학회지 v.28 no.2 그물어구의 유수저항과 모형측정 - 1.유수저항의 해석 및 평면 그물감의 자료에 의한 검토 김대안
  7. 日水誌 v.55 평면망지에 작용하는 波力에 관하여 傅 恩波;佐藤一修;梨本勝昭;山本勝太郞
  8. 水山土木 v.19 no.1 金綱生甥에 作用하는 流體力과 係留素張力에 관한 基礎的 硏究 秀島好昭
  9. 해양수산부 연구보고서 컴퓨터를 이용한 트롤 어구 설계 및 예망 자동화 시스템 개발 이춘우(외 17명)
  10. 일반물리학 현재경(외6명)
  11. 한국수산학회지 v.28 no.2 그물어구의 유수저항과 모형측정 - 2. 자루형 그물의 유수저항 김대안