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http://dx.doi.org/10.5139/JKSAS.2003.31.5.010

A Study of Computation Methods for Dynamic Damping Coefficients of an Airship  

Park, Su Hyeong (한국과학기술원)
Jang, Byeong Hui (한국항공우주연구원)
Kim, Yu Jin (한국과학기술원)
Gwon, Jang Hyeok (한국과학기술원)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.31, no.5, 2003 , pp. 10-17 More about this Journal
Abstract
Dynamic stability is critically required to stabilize an airship which is statically unstable. Numerical computations were performed in order to support and confirm the foced oscillation wind tunnel tests. To analyze the low-speed flow filed around the airship, a low-Mach number preconditioned method was applied. Using two computation methods, variations of the dynamic damping coefficients were examined. Numerical results show that it is dynamically stable for three directional moments, but unstable for normal or side force. It is revealed that the damping coefficients are more sensitive to the direction of the angular rate than the angle of attack or the magnitude og angular rate.
Keywords
Airship; Unsteady Euler equations; Low-Mach number preconditioning; Dynamic damping coefficients;
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1 박수형, 성춘호, 권장혁, "압축성 유동에 대한 다중격자 DADI 기법의 수렴성 연구," 한국항공우주학회지 29권 5호, 2001, pp.25-32.
2 Weiss, J. M., and Smith, W. A., "Preconditioning Applied to Variable and Constant Density Flows," AIAA Journal, Vol. 33, No. 11, 1995, pp.2050-2057.   DOI   ScienceOn
3 장병희, 조태환, "정적 풍동시험 자료를 이용한 동안정미계수 산출 코드 개발," 제11차 유도무기 학술대회 논문집, 2001.
4 Weinacht, P., "Navier-Stokes Predictions of Pitch Damping for Axisymmetric Projectiles," Journal of Spacecraft and Rockets, Vol. 34, No. 6, 1997, pp.753-761.   DOI   ScienceOn
5 박수형, 권장혁, 허기훈, 변우식, "천음속 미사일의 동안정성에 대한 충격파 영향," 한국항공우주학회지, 30권, 2호, 2002, pp.12-20.
6 Park, S. H., Kim, Y., and Kwon, J. H., "Prediction of Damping Coefficients Using the Unsteady Euler Equations," Journal of Spacecraft and Rockets, Vol. 40, No. 3, 2003.
7 Compbell, P., Johnson, J. L., and Hewes, D. E., "Low-Speed Study of the Effect of Frequency on the Stability Derivatives of Wings Oscillating in Yaw with Particular Reference to High Angle-of-Attack Conditions," NACA RM L55H05, 1955.
8 장병희, 이융교, 옥호남, "50m급 비행선의 강제진동 풍동시험," 한국항공우주학회 추계학술발표회 논문집(I), 2002, pp. 101-106
9 조상오, 장병희, 이장연, "정적 시험을 이용한 비행선의 동안정미계수 산출," 한국항공우주학회 추계학술발표회 논문집(I), 2002, pp.97-100.
10 Choi, Y.-H. and Merkel, C. L., "The Application of Preconditioning in Viscous Flows," Journal of Computational Physics, Vol. 105, 1993, pp.207-223.   DOI   ScienceOn
11 조환기, 백승욱, 허원욱, 박재현, 장조원, "표준 동력학모델의 피치 동안정미계수 측정에 관한 연구," 한국항공우주학회지, 28권, 5호, 2000, pp. 11-16.
12 Jameson, A., "Solution of the Euler Equations by a Multigrid Methods," Applied Mathematics and Computaion, Vol. 13, 1983, pp.327-356.   DOI   ScienceOn