• 한국정밀공학회지
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• 제16권5호통권98호
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• pp.104-111
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• 1999

A semi-active suspension system for a vehicle using an Electrorheological Fluid damper has been studied. Apparent viscosity of ERF(Electrorheological Fluid) can be changed rapidly by applying electric field. The damping force of ER damper can be selectively controlled by employing electric field to the ER fluid domain. This paper deals with a two-degree-of-freedom suspension using the ER damper for a quarter car model. An intelligent control method using fuzzy control with genetic algorithm has been employed to control the damping force of the ER damper. The GA designs the optimal structure and performance of Fuzzy Net Controller having hybrid structure. The designed fuzzy net controller has been compared with the skyhook type controller for a quarter car model. The computer simulation results show that the semi-active suspension with ER damper has a good performance in the sense of ride quality with less vibration for ground vehicle.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2014년도 추계학술대회 논문집
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• pp.26-27
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• 2014

This paper proposes a new bed stage system for vibration attenuation in patient compartment of ambulance. The bed stage which consist of four MR dampers can isolate vibration in the vertical, rolling and pitching directions. After evaluating dynamic characteristics of MR damper, 1/4 bed stage model is formulated. The sky hook controller is then utilized for vibration control. Finally, control responses of the bed stage equipped with MR dampers are presented.

• 한국기계가공학회지
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• 제5권3호
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• pp.5-10
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• 2006

The objective of this paper is to investigate the Intelligence control characteristics of a digital damper. This paper deals with a two-degree-of-freedom suspension using the damper with ER fluid for a quarter vehicle system. The control law for semi-active suspensions modeled in this study is developed using passive and ANFIS control method. Computer simulation results show that the semi-active suspension with ER damper has good performances of ride quality.

• 한국정보통신학회논문지
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• 제10권6호
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• pp.1147-1152
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• 2006

본 논문에서는 스카이훅댐퍼 시스템의 해석 및 설계에 능동 서스펜션 강인제어 이론을 적용하여 현가장치설계에 응용 할 수 있는 이론 및 실험적 제어 장치 적용에 관한 연구를 수행하였다. 최근의 현가장치설계에서는 강성과 감쇠를 능동적으로 제어하는 기술의 적용이 일반화되고 있으며, 다른 차량안정성제어장치와의 연계성이 높아짐에 따라, 제어시스템설계에서 보다 내구성이 강하고 제어효과의 응답성이 빠르며 정도 또한 높은 제어장치의 필요성이 요구되고 있다. 본 연구는 센서의 위치 관계에 따른 능동현가시스템을 해석하여 위와 같은 빠른 응답성과 높은 정도의 제어가 가능한 제어시스템을 해석, 설계하기 위하여 강인제어시스템의 적용에 관한 고찰을 하였다. 그리고 제어대상시스템에 대한 강인제어시스템을 설계하기 위한 모델링 및 적용방법을 수식적으로 해석하였으며, 스카이훅현가장치의 제어시스템설계에 중요한 내외란성 향상을 위한 강인제어 시스템설계에 적용하는 방법에 관해 고찰하였다.

• 한국자동차공학회논문집
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• 제2권2호
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• pp.83-94
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• 1994

Performance test result on prototype car equipped with low-band type active suspension system is reported. Control theory is explained first. Simulation for feasibility and parameter tuning, control module test using hydraulic exciter and test run, and performance evaluation of the test car on test track are reported successively. Emphasis was put on modification of control theory which caused many unexpected problems in actual implementation.

• 한국자동차공학회논문집
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• 제2권2호
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• pp.73-82
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• 1994

Low-band type active suspension system is implemented on a passenger car. Level. roll, pitch and bouncing motion of body are controlled by a digital controller. Sky-hook damper is applied to control bouncing motion. This paper describes overall construction of the system, design of hydraulic system, sensor system, controller, and control scheme. Performance of prototype car has been evaluated on a test track and reported in the second paper.

• 대한기계학회논문집A
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• 제24권3호
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• pp.691-700
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• 2000

This paper presents a novel type of a semiactive damper featuring an electro-rheological(ER) fluid. Unlike conventional cylindrical ER damper, the proposed one has controllable orifices by the intensity of electric fields (We call it orifice type). The dynamic model of the orifice type ER damper is formulated by incorporating field-dependent Bingham properties of an arabic gum-based ER fluid. Design parameters such as electrode gap are subsequently determined on the basis of the dynamic model. After manufacturing the orifice type ER damper, field-dependent damping forces and damping force controllability are empirically evaluated. In the evaluation procedure, conventional cylindrical ER damper is adopted and its performance characteristics are compared with those of the orifice type ER damper. In addition, the proposed one is installed with a full-car model and its vibration control performance associated with a skyhook controller is investigated.

• 동력기계공학회지
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• 제5권2호
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• pp.87-92
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• 2001

Automotive suspension system is a mechanism for isolation of the vibration coming from the road inputs. Recently, the electronically controlled suspension systems which may improve ride and handling performance have been developed. Here, the continuously controlled semi-active suspension system is focused. As a mechanism to control damping forces continuously, a solenoid valve is used. The modeling for the solenoid valve is introduced briefly, a vehicle dynamics modeling is constructed, and then combined system model is completed. To design the efficient control algorithm for the semiactive suspension system the knowledge based fuzzy logic is applied and the technique how to apply the sky-hook theory to the fuzzy logic is developed. Finally, to confirm the improvement of performance the computer simulation is carried out.

• 한국소음진동공학회논문집
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• 제26권2호
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• pp.157-164
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• 2016

이 논문은 MR 댐퍼를 적용한 맥퍼슨 타입의 반 능동 현가장치의 진동제어에 관한 연구를 보여준다. 맥퍼슨 스트럿의 기하학적 분석을 바탕으로 동역학 지배 방정식이 설립되었으며, 제어기 설계를 위해 평형 점 근처의 비선형적 운동이 선형화하였다. 이어서 시스템의 향상된 반응시간을 위해 새로운 적응 움직임 슬라이딩모드 제어기를 제안하였으며, 시뮬레이션을 통해 범프와 랜덤도로에서 차량으로 가해지는 진동에 따른 제어 성능을 기존슬라이딩모드 제어기 및 스카이훅 제어기와의 비교를 통해 우수성을 평가하였다.

• 한국군사과학기술학회지
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• 제13권6호
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• pp.967-975
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• 2010

There have been a lot of efforts on the improvement for the ride comfort and handling stability of the combat vehicles. Especially most of vehicles for military purpose have bad inertial condition and severe operating condition such as the rough road driving, and need a high mobility in the emergency status. It is necessary to apply the controlled suspension system in order to improve the vehicle mobile stability and ride comfort ability of crews. A feasibility study is performed on the application of the semi-active suspension system with a magneto-rheological controlled shock absorber for a $6{\times}6$ combat vehicle. First, the dynamic simulation model of the vehicle including the control model for the semi-active suspension system was executed. Based on this model, a hardware-in-the-loop simulation(HILS) system which has a semi-active suspension controller hardware was constructed. After full vehicle simulations were performed in virtual proving courses with this system, the semi-active suspension system was proven to give better ride comfort and handling stability in comparison with the conventional passive suspension system.