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배상은(Sangeun Bae),김원영(Wonyeong Kim),김인섭(Insup Kim),서유원(Yuwon Seo) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
The stabilizer bar maintain the stability and attitude of the vehicle when it is travelling in curves. Cornering maneuvers with reduced body roll and without comfort loss are important requirements for car manufacturers. In order to solve these problems, an electric Active Roll Control(ARC) system is being studied, but it is still composed of very complicated parts, which is heavy and expensive. In this thesis, a semi-active stabilizer bar system of mechanical structure is developed, which is weight reduction, cost down and similar performance than the active stabilizer bar. The feasibility of the system was verified from finite element analysis and test.
코일스프링 하중축 제어를 통한 차량의 승차감 개선에 대한 연구
김인섭(Insup Kim),김선준(Sun Jun Kim),배상은(Sangeun Bae) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
Recently, many papers on suspension system to improve vehicle comfort have been actively studied. However, most of the studies have difficulties to actualize due to the application of complex features that additional sensors and actuators. In order to solve these problems, this paper suggests a new type of semi-active suspension system with low cost, which is applied of curved spring with motor and passive damper. This paper proposes lever ratio control system by rotating curved spring except any major structural changes of suspension system. In this paper, the development of curved coilsprings with posture control carried out a study on the height adjustment and ride comfort improvement system according to the change of load.
SUV 차량의 비선형성을 갖는 스테빌라이져바 시스템의 동특성 예측
박은지(Eunji Park),남찬혁(Chanhyuk Nam),최성진(Sungjin Choi),이진승(Jinseung Lee),배상은(Sangeun Bae) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7
Recently, Consumers demands for handling and ride comfort are increasing, but handling and rride comfort are performance factors that have opposite characteristics. To meet the needs of these consumers, carmakers are actively developing active suspension technology to satisfy two different performance features at the same time. The active suspension system consists mainly of elements such as K&C performance, spring, stabilizer bar and damper, and is being commercialized and developed as a system that allows the overall roll control of the vehicle to enhance handling and ride comfort performance. These systems, however, must be equipped with hydraulic pressure or motors, and are designed to regulate the overall roll stiffness of the vehicle through a separate controller. so they are mainly installed in high-end vehicles due to their complex structure and high price. In this paper, It is purposed a semi-active stabilizer bar model with nonlinear stiffness. This made it possible to improve not only the handling stability but also the ride comfort through nonlinear stiffness curves. It was intended to predict the dynamic performance of a semi-active stabilizer bar through the dynamic analysis. The handling stability was evaluated through J-turn and Double lane change, and the ride comfort was evaluated using ISO8608 road surface provided by ADAMS.
후륜 현가계 커브형 스프링 적용을 통한 조종안정성 예측에 관한 연구
박은지(Eunji Park),박영운(Youngwoon Park),최성진(Sungjin Choi),고웅희(Woonghee Ko),배상은(Sangeun Bae) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
If consumers in the past demanded the powertrain performance of the vehicle, the recent trend is for consumers to favor vehicles with excellent handling and ride quality. Recently, vehicle makers are focusing on developing an active suspension that actively controlled between the handling performance of a sports car and the ride quality of a luxury car. In these days, in Korea, active air suspension system that can actively adjust ride comfort and steering stability by using pneumatic pressure is commercialized, but it has volume, weight and complex structure. This reserch propose a spring type active suspension module designed to overcome the disadvantages of the currently commercialized active air suspension. And to predict the steering stability through the analytical approach. In order to evaluate the stability of the vehicle through the analysis, the actual SUV vehicle was measured to construct the Adams Car model, and a model with more than 80% reliability was developed. Simulation of double lane change (DLC) and J-turn was carried out by applying spring active suspension module to the developed analytical model. The change of steering stability according to the mounting angle of the curved spring was confirmed. The validity of the steering stability according to the change of the wheel rate of the relevant system was judged..