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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.
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.