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Sailing Characteristics of a Model Ship of Weis-Fogh Type

Weis-Fogh형 모형선의 주행특성

  • Ro, Ki-Deok (Department of Mechanical System Engineering, Gyeonsang National University) ;
  • Seok, Jae-Yong (Department of Mechanical System Engineering, Gyeonsang National University)
  • 노기덕 (경상대학교 기계시스템공학과) ;
  • 석재용 (경상대학교 기계시스템공학과)
  • Published : 2010.01.01

Abstract

A model of the propulsion mechanism, I, II, III was based on a two-dimensional model of the Weis-Fogh mechanism and consisted of one or two wings in a square channel. The sailing and vibration performance characteristics of model ships were tested to compare with each other. we took results as follow. Thrust of propulsion model, I and III was increased by 31% and 43%, the speed of model ship by 20% and 23%, When compared to model II in same condition. The thrust improvement using the elastic spring wing was effective not only on all models but also in the real ship. The maximum amplitude and RMS were largest at the opening angle ${\alpha}=15^{\circ}$ and smallest at ${\alpha}=30^{\circ}$ on the vibration of model ship. The thrust of propulsion model III with opening angle ${\alpha}=30^{\circ}$, phase ${\Delta}T=0^{\circ}$ was large, but the amplitude of vibration was small relatively.

본 연구에서는 Weis-Fogh 메카니즘의 원리를 응용한 수 종류의 추진모델을 간략하고, 이 추진모델을 기계화한 소위 Weis-Fogh 형 모형선을 제작하여, 추진모델 I, II, III의 주행특성과 진동특성을 비교, 검토함과 동시에, 탄성날개가 실선에서도 유효한지 주행실험을 통하여 파악한 것이다. 그 결과를 요약하면 다음과 같다. 추진모델 II에 대하여 추진모델 I 및 III의 추력은 각각 1.31배 및 1.43배의 크기로 발생했고, 선속은 각각 1.20배 및 1.23배 증가했다. 탄성날개를 이용한 추진력 개선은 실선에서도, 모든 추진모델에 대해서도 유효했다. 최대진폭 및 RMS값은 열림각 ${\alpha}=15^{\circ}$에서 가장 큰 값을 나타내며, 열림각 ${\alpha}=30^{\circ}$에서 가장 작게 나타났다. 출력성능 면에서 열림각 ${\alpha}=30^{\circ}$, 추진모델 III의 ${\Delta}T=0^{\circ}$의 경우가 비교적 추력이 크고, 진동특성도 우수했다.

Keywords

References

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Cited by

  1. Unsteady flow field numerical calculations of a ship’s rotating Weis-Fogh-type propulsion mechanism with the advanced vortex method vol.26, pp.2, 2012, https://doi.org/10.1007/s12206-011-1208-z
  2. Calculation of Hydrodynamic Characteristics of Weis-Fogh Type Water Turbine Using the Advanced Vortex Method vol.38, pp.3, 2014, https://doi.org/10.3795/KSME-B.2014.38.3.203
  3. Numerical Calculation of Unsteady Flow Fields: Feasibility of Applying the Weis-Fogh Mechanism to Water Turbines vol.135, pp.10, 2013, https://doi.org/10.1115/1.4024956