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Design, Fabrication and Evaluation of MR Damper

Authors: A. Ashfak, A. Saheed, K. K. Abdul Rasheed, J. Abdul Jaleel


This paper presents the design, fabrication and evaluation of magneto-rheological damper. Semi-active control devices have received significant attention in recent years because they offer the adaptability of active control devices without requiring the associated large power sources. Magneto-Rheological (MR) dampers are semi- active control devices that use MR fluids to produce controllable dampers. They potentially offer highly reliable operation and can be viewed as fail-safe in that they become passive dampers if the control hardware malfunction. The advantage of MR dampers over conventional dampers are that they are simple in construction, compromise between high frequency isolation and natural frequency isolation, they offer semi-active control, use very little power, have very quick response, has few moving parts, have a relax tolerances and direct interfacing with electronics. Magneto- Rheological (MR) fluids are Controllable fluids belonging to the class of active materials that have the unique ability to change dynamic yield stress when acted upon by an electric or magnetic field, while maintaining viscosity relatively constant. This property can be utilized in MR damper where the damping force is changed by changing the rheological properties of the fluid magnetically. MR fluids have a dynamic yield stress over Electro-Rheological fluids (ER) and a broader operational temperature range. The objective of this papert was to study the application of an MR damper to vibration control, design the vibration damper using MR fluids, test and evaluate its performance. In this paper the Rheology and the theory behind MR fluids and their use on vibration control were studied. Then a MR vibration damper suitable for vehicle suspension was designed and fabricated using the MR fluid. The MR damper was tested using a dynamic test rig and the results were obtained in the form of force vs velocity and the force vs displacement plots. The results were encouraging and greatly inspire further research on the topic.

Keywords: electro-rheological fluid, MR damper, Magneto-rheological Fluid, Semiactive controller

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[1] Ahmadian, M., (1999) "Design and development of magnetorheological dampers for bicycle suspensions", American Society of Mechanical Engineers, Dynamic Systems & Control Division Publication, DSC, Vol. 67, pp.737-741
[2] Ahmadian. M., J. C. Poynor, J. M. Gooch, (1999) "Application of magneto-rheological dampers for controlling shock loading", American Society of Mechanical Engineers, Dynamic Systems & Control Division (Publication) DSC-, Vol.67, pp. 731-735.
[3] Carlson D,(2001) D. M. Catanzarite and K. A. St. Clair, "Commercial magneto-rheological fluid devices", Lord Corporation.
[4] Carlson, J. D., W. Matthis, and J. R. Toscano., "Smart prosthetics based on magneto-rheological fluids", SPIE 8 th Annual Symposium on Smart Structures
[5] "Designing with MR fluids", (1999) Lord Corporation Engineering note, Thomas Lord Research Center, Cary, NC.
[6] Dyke.S.J., B.F. Spencer Jr., M.K. Sain, and J.D. Carlson, (1996) "Seismic response reduction using magneto-rheological dampers", Proceedings of the IFAC World Congress; San Francisco, CA
[7] Poyner, C. James (2001), "Innovative designs for magneto-rheological dampers", MS Thesis, Advanced Vehicle Dynamics Lab, Virginia Polytechnic Institute and State University, Blacksburg, VA.
[8] Seval. G, (2002) "Synthesis and properties of magneto rheological (MR) fluids", PhD. Thesis, University of Pittsburgh.
[9] Spencer. B. F Jr., S. J. Dyke, M. K. Sain and J. D. Carlson, (1996) "Phenomenological model of a magneto-rheological damper", ASCE Journal of Engineering Mechanics, pp.1-23
[10] "Vibration and Seat Design", (2001) Lord Corporation white paper, Thomas Lord Research Center, Cary, NC.