http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Calculation of Knee Joint Moment in Isometric and Isokinetic Knee Motion
남윤수,김성남,백소라 한국정밀공학회 2011 International Journal of Precision Engineering and Vol. No.
This paper proposes a knee joint moment estimating algorithm which utilizes the surface EMGs of involved muscles and joint angle kinematic data. This algorithm will be essential part for the control system design of exoskeletal robotic devices. In order for this algorithm to accurately predict joint moments, it is necessary to know the one’s musculo-skeletal properties, which is virtually impossible. An optimization process is used to determine one’s musculo-tendon characteristics. The proposed method is evaluated through the comparison with the isokinetic experimental results. Based on the analysis on this comparison, it is claimed that the gravity compensation data of the dynamometer (CON-TREX MJ system) contains not only purely gravity compensated portion but also the knee joint moment contributed by the passive muscle fiber forces.
The effect of torque scheduling on the performance and mechanical loads of a wind turbine
남윤수,라요한,손재훈,오용운,조장환 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.5
The generator torque control loop of a multi-MW wind turbine consists of three operational regions, i.e. a max Cp region, a transientregion around the rated rotor speed, and a power regulation region. The performance and mechanical stress on the wind turbine structureare closely related with how the torque schedule is mechanized in the transient and above-rated regions. Using a drive train model, theclosed loop dynamic characteristics for different torque schedules were analyzed. It is found that the slope of the torque for the rotorspeed in the transient region is the major factor which determines the performance and mechanical loading of the wind turbine. The effectof using a variable torque instead of the fixed rated torque in the above-rated region is also analyzed.
스트레인 게이지 변위추정 센서를 사용한 유동공진 가진기 설계
남윤수,최재혁,강병하,Nam, Yun-Su,Choe, Jae-Hyeok,Gang, Byeong-Ha 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.9
Heat dissipation technology using the flow resonant phenomenon is a kind of a new concept in the heat transfer area. A vibration exciter is needed to enhance air flow mixing which has the natural shedding frequency of thermal system. A mechanical vibrating device for the air flow oscillation is introduced, which is driven by a moving coil actuator with a displacement estimator using strain gage. An analytical dynamic model for this mechanical vibration exciter is presented and its validity is checked by the comparison with experimental data. Values of some unknown system parameters in the analytic model are estimated through the system identification approach. Based on this mathematical model, the vibration exciter using strain displacement estimator is developed. During the experimental verification phase, it turns out the high modal resonant characteristics of a vibrating plate are a major barrier against obtaining a high bandwidth vibration exciter.