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Estimation of Hydrodynamic Derivatives and Dynamic Stability for Submarine Using Captive Model Test

구속모형시험을 이용한 잠수함의 동유체력 계수 추정 및 동안정성 평가

  • Jeong, Jae-Hun (Dept. of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Ok, Ji-Hun (Dept. of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Lee, Chi-Seung (Dept. of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Lee, Jae-Myung (Dept. of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Lee, Seung-Keon (Dept. of Naval Architecture and Ocean Engineering, Pusan National University)
  • 정재훈 (부산대학교 조선해양공학과 대학원) ;
  • 옥지훈 (부산대학교 조선해양공학과 대학원) ;
  • 이치승 (부산대학교 조선해양공학과) ;
  • 이제명 (부산대학교 조선해양공학과) ;
  • 이승건 (부산대학교 조선해양공학과)
  • Received : 2015.01.28
  • Accepted : 2015.03.20
  • Published : 2015.06.30

Abstract

In these days, the world has been increasing the development of various underwater vehicles such as ROVs (Remotely operated underwater vehicles) and AUVs (Autonomous underwater vehicles). And the importance of submarine's maneuverability is especially being emphasized. Therefore, accurate values of the derivatives in equations of motion are required to control motion of the submarines. The aims of the present study are to experimentally derive Hydrodynamic derivatives derived by the vertical planar motion mechanism (VPMM) model test, and to estimate vertical dynamic stability was estimated by using the linear hydrodynamic derivatives, the hydrodynamic derivatives of the submarine, which have a high propriety, were provided by using the fourier analysis of measured forces and moments. Furthermore it is confirmed that the experimental derivatives shows well agreement with the theoretical estimations, and the dynamic stability of the submarine was estimated as a good state, which implies that the value is greater than zero.

최근 국내외적으로 수중 유도무기체계 개발로 다양한 형태의 수중운동체 기술이 발전되고 있다. 특히 수중운동체 중 하나인 잠수함은 한국의 특수한 상황에서 최적의 선형설계를 위한 신뢰도 높은 조종성 평가 기술이 요구되며, 이를 위한 정확한 동유체력 계수의 추정 또한 중요한 연구 분야라 할 수 있다. 따라서 본 논문에서는 잠수함 모형을 대상으로 구속모형시험인 VPMM (Vertical Planar Motion Mechanism) 시험을 실시하여 정밀도 높은 동유체력 계수를 추정하였다. 그리고 추정된 연직면 운동에 대한 선형 (Linear) 동유체력 계수 (Hydrodynamic derivatives)들을 이용하여 동안정성 (Dynamic Stability)을 판별하였다. 그 결과, 이론추정치와의 비교를 통해 동유체력 계수의 타당성이 검증되었으며, 잠수함의 연직면 동안정성도 양호한 것으로 평가되었다. 즉, 무한수심으로 정의되는 심도 6.0의 깊은 수심으로 갈수록 주기에 따른 변화가 작아지며, 이론추정치에 근사함을 확인할 수 있었다. 한편 연직면 동안정성 판별에 있어서는, 0보다 큰 양(+)의 값을 가짐으로서 연직면 운동에 대한 동안정성을 만족하는 것으로 나타났다.

Keywords

References

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