Design, Fabrication and Testing of Magnetorheological Damper System for Machine Tool Application

초록

Magnetorheological (MR) damper makes use of magnetorheological fluids (MRFs) as a working fluid. MRFs are smart fluids which can change their properties under the influence of external stimulus. They can change behaviour from a liquid state to that of semi-solid with yield stress when exposed to external magnetic fields and back to liquid in absence of magnetic field. This change occurs in fractions of seconds. MRFs are suspensions of micron-sized magnetizable particles disperse in a nonmagnetic carrier fluid. These particles align themselves in the direction of the applied magnetic field forming a chain like structure, thereby resisting the fluid flow. In this project, we are optimizing the composition for a silicon oil-based MR fluid in the laboratory and then test it using a magnetic rheometer to measure different rheological properties such as viscosity, shear stress and yield stress, and then design and fabricate a damper-based on the same MR fluid. The damper is designed based on a mathematical model and further optimized using MATLAB. The damping coefficient varies in accordance with the intensity of the magnetic field, thus providing the required damping force. A test rig was designed for testing out the performance of the designed damper. © 2021, Springer Nature Singapore Pte Ltd.

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