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이동식(D. S. LEE),이현욱(H. W. LEE),정영우(Y. W. Jeong),양홍익(H. I. Yang),안길영(K. Y. Ahn) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Recently, high reliability of electrical power system is required. Accordingly, for the protection of the power systems used circuit breakers are required high reliability. Nowadays general interruption time of circuit breaker is 3~5 cycle, but recently, to meet the needs of the high reliability, research on high speed circuit breaker has been made. The studies of high speed circuit breaker consist of research of high speed protection relay and high speed circuit mechanism. In this study, we proposed high speed mechanism with hybrid type mechanism, which consists of conventional spring mechanism and Thomson coil actuator.
그물 기반 우주 물체 포획 기술을 위한 사출 메커니즘 설계
김세준,송다한,김혜진,박재상,조해성 한국소음진동공학회 2024 한국소음진동공학회 논문집 Vol.34 No.3
This paper presents an ejector for active debris removal using a space net. A non-explosive space-net ejection mechanism based on a spring’s elastic restoration force was developed. Through a literature review, the key parameters for the ejection mechanism were defined. Then, a spring design that satisfies these parameters was developed and verified through numerical simulations. Based on the designed spring, a three-dimensional configuration of a single space-net ejector was developed. Structural analysis was conducted under static and dynamic conditions to investigate the relevancy of the design, accounting for the spring’s elastic restoration force and launch environment. Finally, the ejector was fabricated, and the hold down and release mechanism was validated.
서종태(Seo Jong-Tae),이병주(Yi Byung-Ju) 한국생산제조학회 2009 한국생산제조학회지 Vol.18 No.5
In these days, biomimetic apprioach in the design and control of robotic system has drawn much attention. The human-being and mammals possess their own feet. Using the mobility of their feet, they are able to walk in various environments such as plain land, desert, swamp, and so on. Previously developed biped robots and four-legged robots did not employ such adaptable foot. In this work, a biomimetic foot mechanism is investigated through analysis of the foot structure of the human-being. This foot mechanism consists of a toe, an ankle, a heel, and some springs replacing the foot muscles and tendons. Using five toes and springs, this foot can adapt to various environments. A mathematical modeling for this foot mechanism was performed and its characteristics were observed through numerical simulation.
김진욱(Jin-Wook Kim),최세범(SeiBum Choi) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7
In modern transmission control, fast and smooth shifting is the most important issue. Efficient power transfer requires fast shifting, and accurate slip control is necessary to improve the drivers ride comfort. In order to improve the slip control performance, it is very important to know the clutch torque. A clutch torque can be known from the clutch disk pressure and torque friction coefficient. The pressure applied to the clutch disk can be measured from the motor current and the force sensor. However, the torque friction coefficient cannot be measured by the sensor. Also, the friction coefficient is unknown because it changes with temperature, slip speed, and pressure on the clutch disk. Therefore, clutch torque estimation with the indirect method has been actively studied. In the forward-direction clutch torque estimation through the engine torque, the exact clutch torque cannot be estimated because the engine torque is inaccurate. Also, the backward-direction clutch torque estimation method using the compliance model has a disadvantage in that the clutch torque cannot be estimated when there is a backlash of the gear. Thus, in this manuscript, we propose a clutch disk torque friction coefficient estimation with a ball-ramp self-energizing mechanism. In the self-energizing mechanism in which the torque caused by friction reinforces the normal force, the gain of the actuator force to the clutch normal force varies according to the friction coefficient. Apply the actuators position and force to the model to obtain the change in gain and estimate the clutch disc torque friction coefficient. he ball-ramp actuator is modeled for the torque friction coefficient estimation, and the test bench experiment verifies the clutch torque estimation performance during shifting. Finally, verification of the proposed model and estimation of the clutch disc torque friction coefficient during shifting are conducted via test bench experiments.
김기석(Ki-Seok Kim),김병상(Byeong-Sang Kim),송재복(Jae-Bok Song),김은석(Eun-Seok Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
It is desirable that the guard robot should be small-sized and light-weighted to increase its portability. In addition, it should be able to overcome a relatively high obstacle to cope with different situations. The jumping robot can reach a higher place more rapidly than other locomotion methods. There are several ways to provide the jumping ability and the use of the elastic energy of a spring is one of the best ways to make the robot compact and lightweight. This paper proposes the jumping robot capable of independent control of the jumping angle and height. The adjustable jumping angle-height mechanism based on the screw-nut mechanism was developed. The validity of the mechanism was verified by various experiments. It is shown that the robot using this mechanism can provide good jumping ability in the rough terrain.