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홍윤혁(Hong Yun-Hyuck),김정태(Kim Jeung-Tae),김정수(Kim Jung-Soo) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
In this paper, To estimate the train exterior noise and environment noise which are occur when High-Speed EMU is driving with the speed of 370㎞/h, Estimated sound source about noise that is appeared during operation based upon noise SPL values. Based on aero-dynamic noise source and wheel-rail noise source, these were already used to the existed research, we have estimated each sound power about measured noise, and computed the sound source to apply on the High-Speed EMU, and also calculated the sound power in case of the maximum operation speed of 370㎞/h.
김경태(Kyeong-Tae Kim),박경희(Kyung-Hee Park),홍윤혁(Yun-Hyuck Hong),최헌종(Hon-Zong Choi),최영재(Young-Jae Choi) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
In modern industry, grinding is one of the most important processes, especially for components used in high technology device. This is mainly because the grinding process can produce ultra precision parts in mass production system with high quality. Recently, the effort on development of multi-function grinding systems, called hybrid grinding systems, has been made for integration of the process, high efficiency and automation with high speed. In this paper, study on an ultrasonic assisted grinding system among the hybrid grinding systems was performed for an optimal design of ultrasonic grinding tool. Using FEM simulation, various types of ultrasonic horns were modeled for ultrasonic frequency of 20㎑ and maximum longitudinal amplitude based on predicting a natural frequency of the ultrasonic horn designed.
초음파 진동을 하는 다이아몬드 연삭공구의 알루미나 세라믹 연삭 가공에 관한 연구
최영재(Young-Jae Choi),송기형(Ki-Hyeong Song),박경희(Kyung-Hee Park),홍윤혁(Yun-Hyuck Hong),김경태(Kyeong-Tae Kim),이석우(Seok-Woo Lee),최헌종(Hon-Zong Choi) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.1
In this study, ultrasonic vibration tool designed and made by using FEM analysis. And machining test was carried out in various machining conditions using ultrasonic vibration capable CNC machine. For work material, alumina ceramic (Al₂O₃) was used while for tool material diamond electroplated grinding wheel was used. To evaluate ultrasonic vibration effect, grinding test was performed with and without ultrasonic vibration in same machining condition. In ultrasonic mode, ultrasonic vibration of 20㎑ was generated by HSK 63 ultrasonic actuator. The two grinding speeds, 1.67㎧ and 3.35㎧, were applied. On the other hand, grinding forces were measured by KISTLER dynamometer.