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속도 오차 외란이 반작용 휠 제어에 미치는 영향에 관한 실험적 연구
김지철,이형준,유지훈,오화석,Kim, Jichul,Lee, Hyungjun,Yoo, Jihoon,Oh, Hwasuk 항공우주시스템공학회 2016 항공우주시스템공학회지 Vol.10 No.1
There are many possible disturbance sources on such a spacecraft, but reaction wheel assembly (RWA) which is generally used for spacecraft attitude control is anticipated to be the largest. These effects on degradation of performance of spacecraft such as attitude stability. In reaction wheel, disturbance caused by imbalance and speed error. It is hard to emulate speed error disturbance because it is not coincide with wheel frequency. This paper concentrates on emulating and analyzing the speed error disturbance. Firstly, classify the causes that lead to speed error disturbance which generate RPM fluctuation. Secondly, simulated with disturbance driver module and reaction wheel assembly which are developed by Spacecraft Control Lab. Experimental investigations have been carried out to test the disturbance emulator module as a disturbance generator for RWA. Measurements and test have been conducted on various fault. Frequency analysis of test data show that speed error disturbance effects on wheel settling wheel speed or fluctuation type.
김지철,윤진혁,이준용,오화석,Kim, Jichul,Yoon, Jinhyuk,Lee, Junyong,Oh, Hwasuk 항공우주시스템공학회 2016 항공우주시스템공학회지 Vol.10 No.1
Bearing friction and disturbance are the important parameters in control spacecraft using reaction wheel. In this paper, those parameters are estimated by preload and oil quantity. In order to determine the bearing preload's impact on performance, measure the disturbance and the bearing friction coefficient with increasing the preload to the allowed amount. And, find the relationship between oil quantity and bearing friction coefficient, measure it with increasing the oil amount in the bearing. With these results as a reference, find the appropriate amount of preload and oil quantity.
소형 위성용 반작용 휠 개발 및 궤도내 구동 결과 분석
김지철,최윤호,이상철,오화석,Kim, JiChul,Choi, YunHo,Lee, Sangchul,Oh, Hwa-suk 한국항공운항학회 2015 한국항공운항학회지 Vol.23 No.4
An on-board reaction wheel is payload of small satellite for space environment test. The reaction wheel is designed for considering physical, electrical, and environmental requirements. In this paper, we report design, manufacturing process and operation performance verification. Furthermore, the specifications of environmental test are performed under environmental conditions for guarantee of stability and reliability. The operation and environment test results are presented to meet the requirements at the reaction wheel flight model.
전위차계를 이용한 무인항공기 조종면 변위 측정 장치 구현 및 적용
김지철,최일규,공성철,전동익,이상철,오화석,강민영,Kim, Ji-Chul,Choi, Il-Gyu,Gong, Sung-Chul,Cheon, Dong-Ik,Lee, Sangchul,Oh, Hwa-Suk,Kang, Min-young 항공우주시스템공학회 2009 항공우주시스템공학회지 Vol.3 No.3
Aircraft flight control surfaces which are one of the most important elements of safety allow a pilot to adjust and control the aircraft's flight attitude. This paper is described of the control surface deflection angle measuring device. Data analysis through ground test and flight test can provide reliability of this device using the present system. It is also shown that measuring system is capable of detecting failure of control surfaces.