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우승훈(S.H.Woo),고영은(Y.E.Ko) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
In this paper, we discuss the design parameters concerned with self-aligning characteristics in the multi-link suspension system during cornering maneuver. We show that the self-aligning mechanism, which is mainly governed by kingpin offset, of the multi-link suspension system is some what different from that of the conventional one. In conventional system which has the fixed kingpin axis, caster trail is the design parameter to adjust kingpin offset, but we can not use caster trail exclusively to set kingpin offset because it is related to generate lateral tire force as well as longitudinal one. We introduce another design parameter to set kingpin offset independently in the multi-link system which has the moving kingpin axis.<br/> The results of computer simulation using a ADAMS half car quasi-static model with compliance show that we are able to control kingpin offset independently by the design parameter introduced above. Also, the results of another ADAMS simulation using the model for the car under mass production show that we can modify the multi-link suspension system in order to improve self-aligning characteristics while all other characteristics keep nearly the same as they were.<br/>
우승훈(S.H. Woo),류제하(J.H. RYU) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_1
This paper presents a new simple algorithm for a semi-active suspension system control. This control algorithm utilizes only vertical wheel velocity instead of vertical body velocity and relative velocity between body and wheel that are required for conventional semi-active controller based on Skyhook theory. A theoretical explanation on the basic idea of new algorithm is made in terms of basic suspension isolation characteristics and in comparison with the Sky-hook algorithm. A quarter car dynamic model with two degrees-of-freedom is simulated to demonstrate the effectiveness of the proposed algorithm. Ride quality in term of the 1/3 octave band RMS acceleration of the sprung mass is compared with specification by the IS02631 and RMS tire deflection and RMS suspension travel are compared with those of Sky-hook algorithm and passive suspension system.
반능동 현가장치의 접지 특성 향상을 위한 이중 스카이훅 알고리즘 개발
우승훈(S. H. Woo),류제하(J. Ryu) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.1
This paper presents a new double sky-hook algorithm for controlling semi-active suspension systems in order to improve road-holding property that the conventional theoretical sky-hook algorithm cannot achieve. The proposed double sky-hook algorithm uses combination of damper coefficients. one from the chassis motion and the other from the wheel motion. Computer simulation using a quarter and a full car dynamic models with the road conditions specified by ISO show the effectiveness of the proposed algorithm. It is observed that the proposed algorithm is the most effective in the vicinity of the wheel hop frequency.
푸시 풀 포워드 컨버터의 주파수 변화, 변압기의 권선비와 1차측 권선 변화에 대한 효율 특성
전준석(J.S. Jeon),김창선(C.S. Kim),김태식(T.S. Kim),임범선(B.S. Im),우승훈(S.H. Woo) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
The push pull forward converter is a very suitable circuit for low output voltage, high output current applications with a wide input voltage range. All the magnetic components (output inductor, transformer, input filter) can be integrated ioto a single core The integrated magnetics can reduce the number of the magnetic components Developed the push pull forward converter rating are of 36~72V input and 33V/30A output. In this converter, the efficiency was measured by 76.4% at full load and 82.95% at half load The maximum efficiency is up to 83% at 200kHz switching frequency, llA output.
벅+하프 브리지 컨버터에서 벅 컨버터의 출력 인덕턴스 값과 스위칭 주파수,변압기 코어 형태에 따른 효율 특성
박남진(N.J.Park),김창선(C.S.Kim),김태식(T.S.Kim),임범선(B.S.lm),우승훈 (S.H.Woo) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
We considered of the efficiency for the Buck+Half bridge converter Tins converter has advantages of applications for a low output voltage, a high output current and a wide input voltage Developed the Buck converter ratings and the Half Bridge converter ratings are 36-72V input and 22V/5A output, 19-24V input and 3.3V/30A output, respectively, Buck converter is operated with zero voltage switching process to reduce the switching losses The 80 1 -97 6% of the efficiency is measured at 184μH output filter inductance of Buck converter. In Half Bridge converter, the 86-96 4% of the efficiency is measured at 100kHz switching frequency with PQI core<br/>