Abstract
The transient behaviour of magnetorheological (MR) damper is a very important parameter affecting the performance of this technology in modern semi-actively controlled suspension systems. Currently, the transient behaviour of the MR damper is limited by dynamics of the MR fluid (MRF) itself. The significant part of MRF response time is a hydrodynamic response time which is connected with transient rheology and development of velocity profile in the slit gap. In this paper, the method for measuring the hydrodynamic response time of MRF operating in valve mode is presented. The hydrodynamic response time of MRF-132DG achieved value of τ90 = 0.78 ms for H = 17.5 kA/m a value of τ90 = 0.65 ms for H = 34 kA/m for given geometry of gap. The difference between model and experiment is lower in higher yield stresses of MRF.
Highlights
Magnetorheological (MR) fluid is a smart material that exhibits a reversible and fast transition from a liquid state to a solid-state under an external magnetic field
The transient behavior of the MR damper is a fundamental property affecting the performance of this technology in modern semi-actively controlled suspension systems
The main aim of this paper is to present a method for measuring the hydrodynamic response time of MR fluid operating in valve mode and preliminary results
Summary
Magnetorheological (MR) fluid is a smart material that exhibits a reversible and fast transition from a liquid state to a solid-state (increase of yield stress) under an external magnetic field. This phenomenon is usually called a magnetorheological effect. The fluid exhibits a significant increase in yield stress. These properties allow the use of MR fluid in electromechanical systems such as dampers. Two sources of the time delay between the control signal and damping force are as follow: (i) dynamics of MR damper hardware and (ii) the magnetorheological fluid dynamics
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