• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.174.5-174
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• 2001

In this paper, mathematical modeling and dynamic characteristics analysis of a continuously variable damper used for semi-active suspension systems are investigated. After analyzing the geometry of a typical continuously variable damper, models for various components including piston, orifices, spring, and valves are proposed and the flow equations during expansion and compression strokes are derived. To verify the mathematical models developed, the dynamic characteristics of the models are simulated using MATLAB/SIMULINK and are compared with experimental results. It was confirmed that the developed models represent well the actual damper and can be used for control system design.

• 기계저널
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• 제33권10호
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• pp.902-911
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• 1993

반능동 현가 시스템의 장점은 능동 및 수동 현가 시스템의 장점을 모두 갖고 있다는 것이다. 즉, 반능동 시스템은 수동 현가장치에 비해 우수한 성능을 제공하면서 대형 액츄에이터나 큰 동력 원을 필요로 하지 않는다. 지금까지는 승차감 및 조향성능을 향상시키기 위한 능동 및 반능동 현가시스템에 관한 연구가 많이 이루어졌으나, 능동 또는 반능동 현가시스템을 이용하여 대형 차량의 주행 안정성을 향상시키고, 대형차량에 의해 주로 발생하는 도로의 파손을 줄이면서 차 량의 수송능력을 향상시키는 연구는 최근에 유럽과 미국의 대형트럭 제조업체와 정부 주도로 활발하게 진행되고 있다. 그러므로 반능동 현가시스템에 의한 대형 트럭의 성능 향상 가능성 및 연구 개발도 승용차용 능동 및 반능동 현가시스템과 함께 앞으로의 주 연구 과제이다. 이글에 서는 우선 가변 댐퍼 및 반능동 현가시스템의 기본 원리를 설명하고, 반능동 현가시스템의 Bilinear Model, 제어방법에 대하여 언급한 후, 컴퓨터 모의 실험결과를 통하여 반능동 현가시 스템에 의한 차량의 동적 성능 향상을 두 가지 측면, 즉, 승용차와 대형트럭의 측면에서 언급될 것이다.

• 한국자동차공학회논문집
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• 제16권3호
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• pp.1-6
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• 2008

The performance of shock absorber is directly related to the car behavior and performance, both for handling and comfort. Most of compact car are assembled the passive shock absorber for cost effect but some of compact driver want better performance of shock absorber than standard parts. Therefore, they want the semi-active suspension control system instead of standard damper system. But they only can change the mechanical damping control shock absorber at A/S market. The mechanical damping control shack absorber can not vary the damping force in driving condition so they do not satisfy the mechanical damping control shock absorber system. In this study, electrically damping force controlled shock absorber system is developed based on the mechanical damping force control damper system. This system can vary damping force by switch on dashboard in driving condition. And, this system can satisfy the requirement of tuning market. Therefore, it is expected the system to show the engineering capability of korean damper company and to increase export market share to oversea damper market.

• 한국정밀공학회지
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• 제25권3호
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• pp.73-82
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• 2008

Recently MR CDC damper has been applied to semi-active suspension control system gradually. Compared to former hydraulic CDC damper, it has rapid time response performance as well as simple internal structure and wide range of damping force. In order to develop control logic algorithm which enables to take maximum advantage of unique characteristics of MR CDC damper, it is inevitable to perform a thorough investigation into its nonlinear performance. In many previous researches, MR fluid model was either simply assumed as Bingham Plastic, or a phenomenological model based on experiment was established instead to predict damping performance of MR CDC damper. These experimental flow model which is not based on flow analysis but intentionally built to fit damping characteristics, may lead to totally different results in case of different configuration or structure of MR CDC damper. In this study, a generalized flow formula from mathematical flow model of MR fluid for annular orifice is derived to analyze and predict damping characteristics when current is excited at piston valve.