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감속 시의 고정부 작용력 측정을 이용한 반작용휠 계의 가진 입력 특성 규명
신윤호(Shin, Yun-Ho),허용화(Heo, Yong-Hwa),오시환(Oh, Shi-Hwan),김대관(Kim, Dae-Kwan),김광준(Kim, Kwang-Joon),용기력(Yong, Ki-Lyuk) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.3
A reaction wheel is commonly used, as an important actuator, to control the attitude of a satellite. Operation of the reaction wheel plays a role of an excitation source to loading equipment inside the satellite. As requirements for environmental vibration to manifest the performance of precision equipment are getting more stringent, the research for analysis or reduction of unwanted action force in high frequency range when operating the reaction wheel is necessary. In this paper, the procedure to extract input forces and damping of a rotor system of reaction wheel is suggested. The analysis for measured action forces of reaction wheel is accomplished and important higher harmonics of action forces are determined. The input forces and damping of the rotor system are, then, extracted by curve-fitting and a particular solution for input force.
김익중(Ik-Joong Kim),장윤찬(Yun-Chan Jang),김철만(Chul-Man Kim),허용화(Yong-Hwa Heo),선종오(Jong-Oh Sun),최신범(Shin-Beom Choi),정종하(Jong-Ha Jeong) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
The stress triaxiality and lode angle parameters are the main factors that determine the failure criterion for ductile fracture. In this paper, a study were conducted on the relationship between the stress triaxiality ratio at failure point and the lode angle parameter for calculating the three-dimensional facture locus of API 5L X65 line-pipe steel. As a result, a non-standardized plate-type specimen was proposed.
김익중(Ik-Joong Kim),장윤찬(Yun-Chan Jang),김철만(Chul-Man Kim),허용화(Yong-Hwa Heo),선종오(Jong-Oh Sun),최신범(Shin-Beom Choi),정종하(Jong-Ha Jeong) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
The stress triaxiality and lode angle parameters are the main factors that determine the failure criterion for ductile fracture. In this paper, a study were conducted on the relationship between the stress triaxiality ratio at failure point and the lode angle parameter for calculating the three-dimensional facture locus of API 5L X65 line-pipe steel. As a result, a non-standardized plate-type specimen was proposed.