An eddy current effect on the response time of a magnetorheological damper: Analysis and experimental validation

[Display omitted] •A fast responsive MR damper is proposed by analyzing the eddy current distribution.•Grooves are carved on inner surface of the housing for reduction of the eddy current.•MR damper response become faster with eddy current reducing design & high resistors. This work proposes a n...

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Bibliographic Details
Published in:Mechanical systems and signal processing 2019-07, Vol.127, p.136-158
Main Authors: Yoon, Dal-Seong, Park, Yu-Jin, Choi, Seung-Bok
Format: Article
Language:English
Subjects:
Core material
Current distribution
Dampers
Damping
Eddy current
Eddy currents
Grooves
Housing
Magnetic cores
Magnetic field
Magnetorheological (MR) fluid
MR damper
Response time
Response time (computers)
Shunt resistance
Taguchi methods
Time lag
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Summary:[Display omitted] •A fast responsive MR damper is proposed by analyzing the eddy current distribution.•Grooves are carved on inner surface of the housing for reduction of the eddy current.•MR damper response become faster with eddy current reducing design & high resistors. This work proposes a new magnetorheological (MR) damper which can produce sufficient damping force within a few millisecond. Firstly, damping force mechanisms of MR damper are analyzed by deriving several equations representing the flow motion. Then, the eddy current analysis of several different core materials is undertaken since it most significantly influences to the time delay of MR damper. After analyzing several candidates of the magnetic core material, the soft magnetic composite (SMC) is selected which has relatively high electric resistivity. In addition, the inner surface of the housing is machined to have many grooves around the housing to reduce the eddy current magnitude. After confirming that the proposed MR damper causes a very small eddy current distribution, two MR dampers are designed and manufactured by considering the order of the influence level of the factors determined on the basis of Taguchi method. The field-dependent damping force to the step input current is then measured in time domain and the response time of MR damper is calculated. It is shown through experimental tests that very fast response time of MR damper can be achieved by reducing the eddy current around the magnetic field zone.
ISSN:0888-3270
1096-1216
DOI:10.1016/j.ymssp.2019.02.058