Force characteristics of a modular squeeze mode magneto-rheological element

Michael J. Craft; Mehdi Ahmadian; Alireza Farjoud; William C. T. Burke; Clement Nagode

doi:10.1117/12.848856

9 April 2010 Force characteristics of a modular squeeze mode magneto-rheological element

Michael J. Craft, Mehdi Ahmadian, Alireza Farjoud, William C. T. Burke, Clement Nagode

Proceedings Volume 7643, Active and Passive Smart Structures and Integrated Systems 2010; 764313 (2010) https://doi.org/10.1117/12.848856
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

Abstract

While few publications exist on the behavior of Magneto-Rheological (MR) fluid in squeeze mode, devices using squeeze mode may take advantage of the very large range of adjustment that squeeze mode offers. Based on results obtained through modeling and testing MR fluid in a squeeze mode rheometer, a novel compression-adjustable element has been fabricated and tested, which utilizes MR fluid in squeeze mode. While shear and valve modes have been used exclusively for MR fluid damping applications, recent modeling and testing with MR fluid has revealed that much larger adjustment ranges are achievable in squeeze mode. Utilizing squeeze mode, a compression element, or MR Pouch, was developed consisting of a flexible cylindrical membrane with each end fastened to a steel endplate (pole plates). The silicone rubber pouch material was molded in the required shape for use in the squeeze mode rheometer. This flexible membrane allows for the complete self-containment of MR fluid and because the pouch compensates for volume changes, there is no need for dynamic seals and associated surface finish treatments on the steel components. An electromagnet incorporated in the rheometer passes an adjustable magnetic field axially through the pole plates and MR fluid. Test results show the device was capable of varying the compression force from less than 8lbs to greater than 1000lbs when the pole plates were 0.050" apart. Simulations were compared against test data with good correlation. Possible applications of this technology include primary suspension components, auxiliary suspension bump stops, and other vibration isolation components, as MR Pouches are scalable depending on the application and force requirements.

Citation Download Citation

Michael J. Craft, Mehdi Ahmadian, Alireza Farjoud, William C. T. Burke, and Clement Nagode "Force characteristics of a modular squeeze mode magneto-rheological element", Proc. SPIE 7643, Active and Passive Smart Structures and Integrated Systems 2010, 764313 (9 April 2010); https://doi.org/10.1117/12.848856

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