Abstract
The magnetorheological (MR) damper uses magnetorheological fluid which, when subjected to magnetic stimuli, generates an increase of damping forces. A significant problem of these dampers is their poor failsafe ability due to power supply interruption. In the case of faults, the damper remains in a low damping state, which is dangerous. This problem can be solved by accommodating a permanent magnet in the magnetic circuit of the damper. However, the magnetic circuit dynamic of this type of damper has rarely been studied. The main aim of this paper is to introduce the magnetic circuit dynamics of the magnetorheological damper/control valve with a permanent magnet. Firstly, the design of the magnetorheological valve with NdFe42 permanent magnet in the magnetic circuit is introduced. The response time of the magnetic field on the unit step of the control signal was calculated by transient magnetic simulation in Ansys Electronics software. The response time of the magnetic field was simulated in the range of 1.2 to 5 ms depending on the electric current magnitude and orientation. The presented MR damper was manufactured and tested. The experiments prove that the permanent magnet significantly affects the dynamics of the magnetic circuit.
Highlights
The magnetorheological (MR) damper utilizes magnetorheological (MR) fluid which, when subjected to magnetic stimuli, generates yield stress increasing its apparent viscosity [1]
The main aim of this paper is to introduce the magnetic circuit dynamics of the MR damper with a permanent magnet
This paper deals with the dynamic behaviour of the magnetic circuit of the MR control valve with a permanent magnet
Summary
The magnetorheological (MR) damper utilizes magnetorheological (MR) fluid which, when subjected to magnetic stimuli, generates yield stress increasing its apparent viscosity [1]. Several designs of the MR damper can be found that differ in the number of coils [2, 3, 4] , the arrangement of the magnetic circuit [3, 4, 5] and the number of gaps [6, 7] etc. If the power supply of the electromagnetic coil is interrupted during damper operation, the damper will remain at the minimum damping level. This is a significant problem for a wide range of MR damper applications (aerospace, rail, etc.). The permanent magnet creates a magnetic flux in the magnetic circuit, which ensures a sufficient damping level during a power supply failure. Using a so-called switchable magnet does not ensure the full fail-safe ability of the MR damper due to the possibility of magnet demagnetisation
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