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문태정,강정호,홍창희 東亞大學校 附設 情報通信硏究所 1998 情報通信硏究所論文誌 Vol.6 No.1
Antilock Brake Sysytem(ABS) si the device for getting the braking force and the cornering force of the car. The ABS sensor consists of a permanent magnet and pickup coil. When the rotor and the sensor changes, The air gap between the rotor and the sensor changes. This disturbs the magnetic flux emanating from the permanent magnet and generates ac voltage in the pickup coil. The frequency fo this ac voltage changes with the speed of rotation, and in this way the system is able to measure the rotation speed of the wheel. The purpose of this report is to describe a development method of a new type sensor after analyzing two kinds of typical sensors.
洪昌憙,金斗泳 동아대학교 공과대학 부설 한국자원개발연구소 1980 硏究報告 Vol.4 No.2
Port variables of double terminated LC ladder filter are transformed by the linear transformation matrix which is chosen from the interconnection rule. Transformed variables are interpreted as a incident and reflected voltage waves. Transmission characteristics of waves are simulated by active RC circuits. Sensitivity analysis of active circuit confirmed that this method is very low sensitivity. Experiment for the 8th order Butterworth bandpass filter is given. Experimental results are agreed well with the theoretical ones.
Dither 효과를 이용한 서어보 위치 제어계의 응답특성 개선
홍창희,장기효 동아대학교 공과대학 부설 한국자원개발연구소 1987 硏究報告 Vol.11 No.1
The position control system of DC servomotor using dither effect improves the characteristics of response, but oscillation in setting the desired position control is caused by jerking motion in the steady state. A method for supressing the jerking motion using dither effect is proposed. By this method compensating the characteristics of response in the case of setting the desired position control, we can verify the useful-ness of this method in obtaining the best characteristics of position control response in the position control system.