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A Study on the Dynamic Characteristics of Airship Through the Flight Test
Gui-Aee Woo,Jong-Kwon Kim,Kyeum-Rae Cho,Dae-Woo Lee 한국항공우주학회 2004 International Journal of Aeronautical and Space Sc Vol.5 No.1
Nowadays, many kinds of research for airship have being studied with increase of interests in airship. But these make little progress even now. In flight test, the data acquisition from the actual flight test has lots of difficulties because the airship dynamic response is slow and sensitive to external environment. In this paper, through the actual flight test, appropriateness of the mathematical dynamic model was presented by showing the test results in various conditions. The turning, the acceleration, and the deceleration motions were tested and analyzed.
항공기 제동시스템 개발을 위한 동영학 모델링 및 실시간 HILS 시험
우귀애(Gui-Aee Woo),전정우(Jeong-Woo Jeon),이기창(Ki-Chang Lee),김용주(Young-Joo Kim) 한국항공우주학회 2004 韓國航空宇宙學會誌 Vol.32 No.1
본 논문에서는 ABS 성능을 갖는 항공기의 제동 성능을 시험하기 위한 동역학 모델 개발과 시험 장치 및 제동 시스템에 대한 연구를 수행하였다. 동역학 모델에 있어 제동시스템의 휠-타이어 모델과 점착계수 모델에 의해 실제 착륙시의 제동 효과를 반영하였다. 노면 상태에 따라 항공기는 제동 특성이 달라지는데, ABS는 낮은 접촉 계수를 갖는 노면에서 제동 효과가 두드러졌다. 슬립율에 따라 점착계수의 특성 곡선을 고려하였으며, HILS 시험을 통해 본 논문의 모델링이 ABS System 개발에 적합함을 보였다. In this paper, aircraft dynamic model was developed for braking performance test of ABS(Anti-skid Brake System) control units. For the improvement of braking performance with ABS control, dynamic modeling was designed and braking control system was researched. The wheel-brake model and gripping coefficient model was included for the real braking effect. With different roadway condition, the aircraft has different braking characteristics. The designed ABS was more effective at low gripping coefficient. By the slip ratio, the characteristic curve of gripping coefficient was considered. After the HILS test, this modeling was proved that it was fit for the development of ABS system.
A Study on the Dynamic Characteristics of AirshipThrough the Flight Test
Woo, Gui-Aee,Kim, Jong-Kwon,Cho, Kyeum-Rae,Lee, Dae-Woo The Korean Society for Aeronautical and Space Scie 2004 International Journal of Aeronautical and Space Sc Vol.5 No.1
Nowadays, many kinds of research for airship have being studied withincrease of interests in airship. But these make little progress even now. In flighttest, the data acquisition from the actual flight test has lots of difficulties becausethe airship dynamic response is slow and sensitive to extemal environment. In thispaper, through the actual flight test, appropriateness of the mathematical dynamicmodel was presented by showing the test results in various conditions. Thetuming, the acceleration, and the deceleration motions were tested and analyzed.
우귀애(Gui-Aee Woo),김종권(Jong-Kwon Kim),조겸래(Kyeum-Rae Cho),이대우(Dae-Woo Lee) 한국항공우주학회 2004 韓國航空宇宙學會誌 Vol.32 No.5
최근 비행선에 대한 관심이 높아지며 여러 분야의 연구가 진행되고 있지만 아직도 비행선의 비행 동특성에 대해 완전하게 정립된 이론은 없다. 또한 비행선은 질량에 비해 부피의 비가 매우 크고 추진력이 다른 비행체에 비해 상대적으로 작으므로 동적 반응이 느리다. 또한 외부 영향(기상 상태)에 대한 민감성이 높기 때문에 시험을 통한 자료의 획득에도 많은 어려움이 있다. 본 논문에서는 시험 비행을 통해 비행선의 동역학 방정식과 공력 데이터, 그리고 제어 특성을 결정짓는 각 조종변의 특성을 파악하여 동일 제어 조건에서 시뮬레이션 데이터와 비교하여 본 논문에 적용된 동역학 모델의 타당성을 검증하였다. 외란이 작용하는 경우, 고속 비행과 저속 비행에서의 시험을 통해 통일한 외란에 대해서도 저속에서는 측풍의 효과가 고속일 때보다 두드러지게 크게 나타남을 확인하였다. Nowadays, many kinds of research for airship are studying with increasing of interests of airship. But these are far from perfect. The data acquisition from the actual flight test has lots of difficulties because of the characteristics from the slow dynamic response and high sensitivity for external environment. In this paper, through the actual flight test, appropriateness of the mathematical dynamic model applied here was verified by comparing the test data with simulation data in same control conditions.
Adaptive Kalman Filter Design for an Alignment System with Unknown Sway Disturbance
Kim, Jong-Kwon,Woo, Gui-Aee,Cho, Kyeum-Rae The Korean Society for Aeronautical and Space Scie 2002 International Journal of Aeronautical and Space Sc Vol.3 No.1
The initial alignment of inertial platform for navigation system was considered. An adaptive filtering technique is developed for the system with unknown and varying sway disturbance. It is assumed that the random sway motion is the second order ARMA(Auto Regressive Moving Average) model and performed parameter identification for unknown parameters. Designed adaptive filter contain both a Kalman filter and a self-tuning filter. This filtering system can automatically adapt to varying environmental conditions. To verify the robustness of the filtering system, the computer simulation was performed with unknown and varying sway disturbance.