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송경주(Kyungju Song),김승균(Seunggyun Kim),최흥재(Heungjae Choi),정용채(Yongchae Jeong) 한국전자파학회 2008 한국전자파학회논문지 Vol.19 No.7
본 논문에서는 변형된 시간 지연 기법을 이용한 마이크로파 2차 주파수 체배기가 제안되었다. 제안된 주파수 체배기에서는 입력 신호와 지연된 신호 사이에 발생하는 군지연 시간 부정합을 전압 제어 지연 선로(VCDL)를 이용하여 보상하였다. 가변 슈미트 트리거를 이용한 군지연 시간 정합과 신호 파형의 성형(waveform shaping)으로 인해 원하지 않는 기본 주파수(f0)와 3, 4차 고조파 성분들이 충분히 제거할 수 있었다. 결과적으로 출력 단자에서는 오직 2 체배된 주파수 성분(2f0)만이 우세하게 나타난다. 제안된 주파수 체배기는 1.15 GHz의 기본 주파수에서 설계되었고 TSMC 0.18㎛ 공정을 이용하여 제작되었다. 입력 신호 전력을 0 ㏈m 인가하였을 때, 2차 체배된 출력 주파수 성분의 측정된 전력은 2.67 ㏈m이었다. 2차 체배된 주파수 성분에 대해 f0, 3f0, 그리고 4f0 성분의 제거율은 각각 43.65, 38.65, 그리고 35.59 ㏈이다. In this paper, a frequency doubler using modified time-delay technique is proposed. A voltage controlled delay line (VCDL) in the proposed frequency doubler compensates the group delay time mismatching between input and delayed signal. With the group delay time matching and waveform shaping using the adjustable Schmitt triggers, the unwanted fundamental component(f0) and the higher order harmonics such as third and fourth are diminished excellently. In result, only the doubled frequency component(2f0) appears dominantly at the output port. The frequency doubler is designed at 1.15 ㎓ of f0 and fabricated with TSMC 0.18 ㎛ CMOS process. The measured output power at 2f0 is 2.67 ㏈m when the input power is 0 ㏈m. The obtained suppression ratio of f0, 3f0, and 4f0 to 2f0 are 43.65, 38.65 and 35.59 ㏈, respectively.
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소원용(Wonyong So),홍중식(Joongsic Hong),김승균(Seunggyun Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
In the case of military wheeled vehicles, the damage of tires in the area of military operation could lead to not only mission failure but also damages to equipment and crews. For the reasons, it is necessary for the tire of tactical vehicles to have the function to maintain it"s basic structure even if it gets damaged. Such a function has been more and more important for military tactical wheeled vehicles, but most of the tires adapted to domestic military tactical wheeled veichles were introduced from advanced military and defense industrial countries. In the research, domestic development procedures of the military tactical wheeled vehicle tire having such a function are introduced and the capability of domestic developments and manufactures of that tire is verified.
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Autodesign을 이용한 야지주행 능동현수장치의 제어 이득 최적화 연구
손영일(Youngil Sohn),이경돈(Kyoung-Don Lee),김승균(Seunggyun Kim),한인식(In-Sik Han) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this paper, in order to acquire optimized control gains for Near Constant Force Suspension(NCFS) strategy of active suspension, we use Autodesign toolkit which is included in Recurdyn software. Wheeled vehicle is modelled using Recurdyn software as a test vehicle, and NCFS control algorithm is implemented using Matlab/Simulink package. Furthermore, these two softwares are connected, which makes a co-simulation platform. Some control gains are defined as a design value in Autodesign toolkit, and vertical displacement, speed, and acceleration of the vehicle are used as a performance evaluation required to calculate the optimum values of the control gains. By selecting the method of design of experiment and meta-model, we can proceed the optimization process easily using this Autodesign toolkit, which results in a good design results which show us better control results compared with the results with manually tuned gains.
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야지주행 차량용 능동현수장치의 1축 HIL 시험환경 구축
이상민(Sangmin Lee),손영일(Youngil Sohn),홍중식(Joongsik Hong),김승균(Seunggyun Kim),김재용(Jaeyong Kim),최교준(Gyojun Choi) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Active Suspension System is replacing pre-existing spring and damper to active actuator. As this system gives control force to the vehicle according to its dynamics, it improves the ride quality, steering stability and controls longitudinallateral unbalanced body and ect. So, this paper is about composing 1 HIL system to develop Electro-mechanical Active Suspension for military 4-wheeled vehicle on off-road. To compose this HILS, motor, decelerator, sensors, sensor signal processing board, power converter, attitude controller, AutoBox and etc were interfaced. Also, the validity of I HIL System was verified testing by 1 HIL System, as vertical acceleration and vertical displacement shows advancement.
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