System identification of ER fluid dampers using a nonlinear mechanisms-based model

Gopalakrishna M. Kamath; Norman M. Wereley

doi:10.1117/12.239055

1 May 1996 System identification of ER fluid dampers using a nonlinear mechanisms-based model

Gopalakrishna M. Kamath, Norman M. Wereley

Proceedings Volume 2717, Smart Structures and Materials 1996: Smart Structures and Integrated Systems; (1996) https://doi.org/10.1117/12.239055
Event: 1996 Symposium on Smart Structures and Materials, 1996, San Diego, CA, United States

Abstract

Electrorheological (ER) fluid behavior has two predominant rheological characteristics. ER fluids behave like viscoelastic materials in the pre-yield region and like viscous fluids in the post-yield region. The transition between the two regions is a strong function of the electric field, strain amplitude and the frequency of excitation. A phenomenological model is introduced that combines these two dominant characteristics to describe the behavior of ER fluid dampers. Linear shear flow mechanisms in the form of mechanical analogs are chosen for each characteristic region and are combined using nonlinear weighting functions. The process of design and fabrication of an ER fluid moving electrode damper is outlined and the testing methodology discussed. Experimental data obtained from the damper is used to determine the model parameters via a system identification technique. The parameters obtained from the system identification procedure show an increasing trend as the electric field is increased. The hysteresis loops are reconstructed using the identified parameters and the results show that the model is capable of accurately capturing the linear and nonlinear behavior of ER fluid dampers.

Citation Download Citation

Gopalakrishna M. Kamath and Norman M. Wereley "System identification of ER fluid dampers using a nonlinear mechanisms-based model", Proc. SPIE 2717, Smart Structures and Materials 1996: Smart Structures and Integrated Systems, (1 May 1996); https://doi.org/10.1117/12.239055

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