Performance Evaluation of a Semi-Active ER Damper with Free Piston and Spring

부동피스톤과 스프링을 갖는 반능동 ER댐퍼의 성능평가

Choe, Seung-Bok;Kim, Wan-Gi

  • Published : 2000.03.01


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


Electro-Rheological Fluid;Semi-Active Damper;Orifice Type;Free Piston;Skyhook Control


  1. 안창섭, 최영태, 최승복, 1998, 'HILS를 통한 ER 현가장치의 성능평가,' 대한기계학회논문집, 제 22 권, 제 11 호, pp. 2061-2071
  2. White Frank M., 1994, Fluid Mechanics, McGraw-Hill inc., pp. 294-346
  3. Werely, N. M. and Pang Li, 1997, 'Nondimensional Analysis of Semi-Active Electrorheological Dampers Using Approximate Parallel plate Models,' Proceedings of the 11th VPI&SU Symposium on Structural Dynamics and Control, pp. 1-18
  4. Karnopp, D., Crosby, M. J. and Harwood, R. A., 1974, 'Vibration Control Using Semi-Active Force Gnenrators,' J. of Engineering for Industry, Vol.96, No.2, pp. 619-624
  5. Hagele, K. H., Engesdorf, K., Mettner, M., Panther, M., Tran, Q. N. and Rubel, E., 1990,' Continuously Adjustable Shock Absorbers for Rapid-Acting Ride Control Systems(RCS),' SAE Technical Paper Series, No. 905125
  6. Petek, N. K., 1992, 'An Electronically Controlled Shock Absorber as an Application of Electro-rheological Fluid,' SAE Technical Paper Series No.920275
  7. Petek, N. K., Romstadt, D. J., Lizell, M. B. and Weyenberg, 1995, 'Demonstration of an Automotive Semi-Active Suspension Using Electrorheological Fluid,' SAE Technical Paper Series, No.950586