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경진호,송달호,Gyeong, Jin-Ho,Song, Dal-Ho 한국기계연구원 1988 기계연구원소보 Vol.18 No.-
Finite element scheme to analyze the vibration characteristics of the axisymmetric rotor system is developed. The rotor system of a large washer-extractor is analyzed as an example. Natural frequency obtained by FEM is in good agreement with experimental one by impact test. Also, parametric studies using FEM code developed are carried out for the investigation of the effects of the radii of the axis and the cylinder on the stiffness and the critical speed of the system. Larger radius of the axis makes the system stiffer and increases the critical speed at which the unbalance response has its maximum value. Whereas, the stiffness and the critical speed decrease at first and then increase as the radius of the cylinder increases.
채터 안정성 해석을 이용한 자기베어링 밀링 주축의 제어기 설계 연구
경진호,박종권,노승국 한국공작기계학회 2002 한국공작기계학회 추계학술대회논문집 Vol.2002 No.-
The characteristic equation for regenerative chatter loop including a delay element replaced by a rational function is presented by a linear differential-difference equation, accounting for the dynamics of the AMB controllers, the uncut chip thickness equation and the cutting process as well as the rigid spindle dynamics itself. The chatter stability analysis of a rigid milling spindle suspended by 5-axes active magnetic bearings(AMBs) is also performed to investigate the influences of the damping and stiffness coefficients of AMBs on the chatter free cutting conditions, as they are allowed to vary within the stable region formed by the AMB control gains. Several cutting tests varying the derivative gains of the AMB were performed to investigate the regenerative chatter vibrations, and it was concluded that the theoretical analysis results are in good consistency with the test results.
경진호,김유일,김종선,이해,Gyeong, Jin-Ho,Kim, Yu-Il,Kim, Jong-Seon,Lee, Hae 한국기계연구원 1993 硏究論文集 Vol.23 No.-
This study presents an intelligent PID control method based on the fuzzy logic and this method is applied to the active magnetic bearing system. By using an appropriate fuzzy matrix, some changes of values of the three coefficients of the controller are determined during system operation and these lead to the improvement of the transient and steady state behavior of the closed loop system. The presented method is actually a combination of the principles of PID control and fuzzy logic. Since the fuzzy logic using linguistic variables in place of numeric variables has many points of likeness to the human logic, the improvement in performance is notable especially in case of large nonlinearity and uncertainty such as the controller start and the excessive mass unbalance. A set of simulation and experimental results illustrate and considerable improvement in the control performance including small overshoot and small transient currents in magnet coils, while maintaining the overal static and dynamic characteristics near the equilibrium position.
김종선,경진호 國立金烏工科大學校附設生産技術硏究所 1991 産業技術開發硏究 Vol.7 No.-
As many modern rotor systems tend to be operated at high speed, there is a lot of demand for the magnetic bearings which have high performance and very high rotating speed compared with rolling element bearings. The leading countries like France, Japan, Switzerland and U.S.A have already been arare of these merits of the magnetic bearings and have researched very actively in this field. In this study, we designed a PID control system for magnetic bearings based on the rigid body model and the frequency response method. We also simulated the stability, steady state performance and other dynamic performances of the designed magnetic bearing system. Finally, we designed and manufactured the 5-axis active magnetic bearing system and experimentally verified the numerical results.