Performance of long-stroke and low-stroke MR fluid dampers

Ralf Boelter; Hartmut Janocha

doi:10.1117/12.310693

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16 June 1998 Performance of long-stroke and low-stroke MR fluid dampers

Ralf Boelter, Hartmut Janocha

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Proceedings Volume 3327, Smart Structures and Materials 1998: Passive Damping and Isolation; (1998) https://doi.org/10.1117/12.310693
Event: 5th Annual International Symposium on Smart Structures and Materials, 1998, San Diego, CA, United States

Abstract

Magnetorheological (MR) fluids can be used to construct electrically controllable dampers for a wide variety of applications. Long-stroke dampers for high vibration amplitudes usually work in the flow mode. They contain MR fluid valves to modify the flow resistance of the fluid and thus the damping force of the actuator. Due to the high vibration amplitudes the MR fluid works in the post-yield area and its viscous behavior dominates. At high piston speeds extremely high flow velocities and shear rates can occur, which reduce the MR effect. At high shear rates the damping under the influence of a magnetic field is nearly independent of the piston speed, whereas the zero field damping force still increases. Low-stroke dampers can be implemented in the squeeze mode. By increasing the magnetic control field a transition from a viscous behavior to a viscoelastic behavior can be observed, which has a strong influence on the energy dissipated by the damper and on the damping force.

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Ralf Boelter and Hartmut Janocha "Performance of long-stroke and low-stroke MR fluid dampers", Proc. SPIE 3327, Smart Structures and Materials 1998: Passive Damping and Isolation, (16 June 1998); https://doi.org/10.1117/12.310693

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