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전자석 가진기를 이용한 고속주축의 회전속도에 따른 툴팁 컴플라이언스 측정
안형준(Hyeong-Joon Ahn),김진현(Jin-Hyun Kim),김종혁(Jong-Hyuk Kim),장동영(Dong-Young Jang),한동철(Dong-Chul Han) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this paper, we proposed a new measuring method of the speed-dependent tool tip compliance of a high-speed machine tool spindle using a magnetic exciter. Single sine wave current excitation is injected through the magnetic exciter, and the displacement and force responses are measured with a CCS (cylindrical capacitance sensor) and a dynamometer, respectively. Then, the tool tip compliance can be esticated accurately without any phase delay by dividing the frequency response from the current to the displacement by that from the current to the force. Finally, the tool tip compliance of a high-speed machine tool spindle was measured successfully using the proposed measuring method.
API 617 회전체 역학적 성능 기준의 제어 공학적 해석
안형준(Hyeong-joon Ahn),여경구(Kyung-ku Yeo),한동철(Dong-chul Han) 한국트라이볼로지학회 2004 한국트라이볼로지학회 학술대회 Vol.38 No.-
The rotordynamic performance of API 617 standards provides two primary requirements. First, the standard stipulates system damping near the expected operating speed range. Second, the standard requires a specific bound of the worst case unbalance response. The problem this poses for machine designers is 1) feasibility: can bearings be designed for a given rotor to meet API 617 and 2) if so, how can these bearings be designed? Our primary effort in this research is to convert the API requirements to a control design objective for a bearing. This permits direct assessment of the feasible design problem as well as providing a means to synthesize optimal bearing dynamics. In addition to providing synthesis of magnetic bearings, the resulting bearing transfer functions give direct guidance to selection of more conventional fluid film or rolling element bearings.