Characterization of Step Response Time and Bandwidth of Electrorheological Fluids

Author:

Gurka Martin1,Petričević Raino2,Schneider Steffen3,Ulrich Stephan4

Affiliation:

1. Institut für Verbundstoffe GmbH, Erwin Schrödinger-Straße, 67663 Kaiserslautern, Germany

2. ERF Produktion Würzburg GmbH, Landwehrstrasse 1, 97249 Eisingen, Germany

3. Bundeswehr Research Institute for Materials, Fuels and Lubricants, Institutsweg 1, 85435 Erding, Germany

4. Helmut-Schmidt-Universität Hamburg, Professorship of Machine Elements and Technical Logistics, Holstenhofweg 85, 22043 Hamburg, Germany

Abstract

The dynamic behavior of the commercially used electrorheological fluid RheOil3.0 is measured under well-defined conditions. Measurements were carried out in shear mode as well as in flow mode using flow channels that provide similar flow conditions to many electrorheological applications. The response times of the change in flow behavior upon a changed electric field are measured. Measurements were carried out in time domain (single step response) as well as in frequency domain (sinusoidal frequency sweep). In most flow conditions, the observed dynamic behavior is characterized by two leading response times of which the fast one is in the millisecond range. Under stable flow or constant shear rate conditions, ionic conductivity is found to be a limiting factor for a quick step response.

Publisher

SAGE Publications

Subject

Mechanical Engineering,General Materials Science

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