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패널법을 이용한 임의의 3차원 BWB 형상 항공기에 대한 공력해석
이세욱(Sea-Wook Lee),양진열(Jin-Yeol Yang),조진수(Jin-Soo Cho) 한국항공우주학회 2009 韓國航空宇宙學會誌 Vol.37 No.11
패널법(panel method)을 이용하여 포텐셜 유동조건에 있는 임의의 3차원 융합익기(Blended-Wing Body) 형상에 대해 정상/비정상 공력해석을 수행하였다. 본 연구 방법은 구간일정강도(piecewise constant strength) 용출(source) 및 중첩(doublet) 특이점(singularity)을 사용하고 Dirichlet 경계조건에 기초한 포텐셜 기저(potential based) 패널법과 물체고정좌표계의 각 방향에 대해 시간전진법(time-stepping method)을 결합한 방법이다. 본 프로그램은 임의의 3차원 BWB 형상 항공기의 공력해석을 빠르고 정확하게 수행할 수 있으며 BWB 항공기의 안정성을 위한 다양한 공력계수를 제공할 수 있다. 본 프로그램으로 3차원 정상/비정상 임의의 3차원 형상에 대하여 공력특성을 예측할 수 있어 BWB 항공기 설계단계, 비행 시뮬레이션과 같이 반복적 빠른 계산을 요구하는 실질적 응용에 크게 기여할 것이다. A panel method based on potential flow theory is developed for the steady/unsteady aerodynamic analysis of arbitrary three-dimensional Blended Wing Body aircraft. The panel method uses the piecewise constant source and doublet singularities as a solution. This potential based panel method is founded on the Dirichlet boundary condition and coupled with the time-stepping method. The present method uses the time-stepping loop to simulate the unsteady motion of the aircraft. The present method can solve the three-dimensional flow over the complex bodies with less computing time and provide various aerodynamic derivatives to secure the stability of Blended Wing Body aircraft. That will do much for practical applications such as aerodynamic designs and analysis of aircraft configurations and flight simulation.
신정우(Jeong Woo Shin),이승규(Seung Gyu Lee),양진열(Jin Yeol Yang),김성준(Sung Joon Kim),황인희(In Hee Hwang),정상준(Sang Joon Chung) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.10
Main role of landing gear is to absorb the energy which is generated by aircraft lanidng and ground maneuvering. Generally, in order to absorb the impact energy during landing, oleo-pneumatic type shock absorber is used for aircraft landing gear. Oleo-pneumatic type shock absorber has a good energy absorbing efficiency and is light in weight because its structure is relatively simple. For the landing gear development, it is necessary to conduct drop test in order to verify shock absorbing performance. In the drop test, first, gas spring curve verification tests are conducted. Then, limit and reserve energy absorption drop tests are performed based on the STANAG 4671. The drop tests results with performance analysis results are presented.
이승규(Seung Gyu Lee),정승택(Seung Tack Jung),양진열(Jin Yeol Yang),김성찬(Sung Chan Kim),안석민(Seok Min Ahn),송정헌(Jung Chen Song) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
A performance of aircraft landing gear is estimated by analysis and verified by drop test. In this paper, a drop test facility is introduced and KC-100 landing gear drop test is presented.