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선체반류를 고려한 프로펠러 최적 스큐화

Propeller Skew Optimization Considering Varying Wake Field

  • 발행 : 2003.10.01

초록

Propellers operating in a given nonuniform ship wake generate unsteady loads leading to undesirable stern vibration problems. The skew is known to be the most proper and effective geometric parameter to control or reduce the fluctuating forces on the shaft. This paper assumes the skew profile as either a quadratic or a cubic function of the radius and determines the coefficients of the polynomial function by applying the simplex method. The method uses the converted unconstrained algorithm to solve the constrained minimization problem of 6-component shaft excitation forces. The propeller excitation was computed either by applying the two-dimensional gust theory for quick estimation or by the fully three-dimensional unsteady lifting surface theory in time domain for an accurate solution. A sample result demonstrates that the shaft forces can be further reduced through optimization from the original design.

키워드

참고문헌

  1. 이창섭, 김기섭, 서정천, 최종수, 1985, "프로펠러에 의한 선체표면 변동압력의 추정(제1보: 실험적 연구)," 대한조선학회지, 제22권 2호, pp.1-26
  2. 이창섭, 이진태, 서정천, 김영기, 1992, "프로펠러에 의해 유기된 선체표면 기진력 해석," 대한조선학회 논문집, 제 29권, 제 1호, pp. 81-92.
  3. 한재문, 이창섭, 1996, "프로펠러 캐비테이션에 의해 유기된 변동압력 계산," 대한조선학회, 춘계학술발표회, pp. 434-437.
  4. Kerwin, J.E. & Lee, C.-S., 1978, "Prediction of steady and unsteady marine propeller performance by numerical lifting surface theory," Trans. SNAME, Vol. 86, Soc. of Naval Arch. & Marine Eng., pp.218-258
  5. Lee, C.-S., 1979, "Prediction of steady and unsteady performance of marine propeller with or without cavition by numerical lifting-surface theory," Ph.D Thesis, MIT
  6. Nelder, J.A. and Mead, R., 1965, "A simplex method for function minimization," Computer Journal, Vol. 7, No. 4, pp. 308-313 https://doi.org/10.1093/comjnl/7.4.308
  7. 1978, "Propeller skew optimization," UM/NAME Report No.204.

피인용 문헌

  1. Study on Performance of High Efficiency Series Propeller (KF Series) for Fishing Vessels vol.49, pp.5, 2012, https://doi.org/10.3744/SNAK.2012.49.5.416