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Magneto-rheological Fluids Revolutionizing Power and Control Systems

The focus of this paper is a “hands-on” activity that was first presented at the National Educator’s Workshop. Sponsors of this workshop included the National Aeronautics & Space Administration (NASA), the National Institute of Standards and Technology (NIST), and the American Society for Engineering Education (ASEE). One of the objectives of this workshop is to provide educators with material activities that they may wish to include in their curriculums. The required format for these material activities is: Introduction; Current Applications; Method of Operation; Summary; Student Activity; Outcomes and Post-Lab Analysis; Sources of Supplies; and then the Activity Procedure.

During the Annual ASEE Conference, selected material activities are presented during a specialized technical session dedicated specifically for these workshop activities. A magneto-rheological fluid device will be available, and all participants are invited to work with this incredible material.

Introduction

Magneto-rheological (MR) fluids are a form of “intelligent” material that change their flow characteristics when subjected to a magnetic field. Response, which takes only milliseconds, is in the form of a progressive gelling that is proportional to field strength. MR fluids can be produced that are capable of giving high shear stresses at low applied magnetic fields. The unique nature of this class of magnetic fluids allows dramatic changes in rheology to occur within the bulk of the fluid on application of a relatively modest magnetic field. The material can change from being fluid to solid almost instantaneously, the rheology of the material reverting to its original state upon removal of the field.

“Response, which takes only milliseconds, is in the form of a progressive gelling that is proportional to field strength. With no field present, the fluid flows as freely as hydraulic oil”.1 As a result, MR technology provides fast and infinitely variable control of energy dissipation of industrial and automotive devices.2 This change of state has the potential to revolutionize the control aspects of vibration and the responsiveness of hydraulic power transmission systems. “The application of magneto-rheological fluids for damping is a unique and novel approach to an age-old problem”. 3

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Marshall, J. (2007, June), Magneto Rheological Fluids Revolutionizing Power And Control Systems Paper presented at 2007 Annual Conference & Exposition, Honolulu, Hawaii. 10.18260/1-2--1634