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1 April 2014 A fail-safe, bi-linear liquid spring controllable magnetorheological fluid damper
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The goal of this study is to demonstrate the feasibility of a fail-safe, bi-linear spring controllable magnetorheological fluid damper (BLS-CMRD). This research introduces a new device with independently pre-set spring forces in compression and rebound combined with a controllable MR fluid damping. In this work, a BLS-CMRD is designed, fabricated, tested and evaluated. Experiments are performed for sinusoidal displacements in the quasistatic and dynamic ranges to evaluate the performance of the BLS-CMRD under different magnetic fields. The experimental results prove that the device reacts with significantly different spring forces from the compression to rebound regions, while providing passive viscous and controllable MR fluid damping. With this first of a kind system it is demonstrated that the utility of a bi-linear liquid spring can be combined with the reliability of passive viscous fluid damping and the capabilities of controllable MR fluid damping into one compact and versatile device.
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Nicholas Maus and Faramarz Gordaninejad "A fail-safe, bi-linear liquid spring controllable magnetorheological fluid damper ", Proc. SPIE 9057, Active and Passive Smart Structures and Integrated Systems 2014, 90570Q (1 April 2014);


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