Controllable Shock Absorber as an Application of Electro-Rheological Fluid

Shin Morishita, Jun’ich Mitsui, Yoji Kuroda

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4 Citations (Scopus)


Electro-Rheological fluid (ERF) has notable characteristics of viscosity which could be applicable for various industrial machines. Viscosity of ERF increases in accordance with the applied electric field. Without an electric field, ERF has the viscosity characteristics of a Newtonian liquid. Variation of viscosity is reversible, and the required time for its variation is said to be as short as 0.001 sec. Numerous applications of ERF in the engineering field have been attempted since the characteristics of ERF were discovered by W.M.Winslow. However, no successful application has ever been reported. This paper deals with the successful application of ERF to a controllable shock absorber system for automobiles. The controllable range of damping force is examined experimentally for various piston speeds. In addition, numerical experiments are performed; in which damping force can be controlled in response to road conditions by using the shock absorber proposed in this paper. Pitching and rolling motions of the automobile are found to be decreased remarkably.

Original languageEnglish
Pages (from-to)928-934
Number of pages7
JournalTransactions of the Japan Society of Mechanical Engineers Series C
Issue number524
Publication statusPublished - 1 Jan 1990



  • Control Device
  • Damper
  • Electro-Rheological Fluid
  • Response
  • Vibration Control

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