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Proceedings Paper

Design and testing of a magnetorheological damper to control both vibration and shock loads for a vehicle crew seat
Author(s): Andrew Becnel; Wei Hu; Gregory J. Hiemenz; Norman M. Wereley
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Paper Abstract

A magnetorheological shock absorber (MRSA) prototype is designed, fabricated and tested to integrate semiactive shock and vibration mitigation technology into the existing Expeditionary Fighting Vehicle (EFV) forward seating positions. Utilizing Bingham-Plastic (BP) constitutive fluid relationships and a steady state fluid flow model, the MR valve parameters are determined using magnetic circuit analysis, and subsequently validated via electromagnetic finite element analysis (FEA). Low speed (up to 0.9 m/s) simulations of normal vibration mode operation are conducted on the MRSA prototype using single frequency sinusoidal displacements by a servohydraulic testing machine. The high speed (up to 2.2 m/s) design procedure is verified by using a rail-guided drop test stand to impact a known payload mass onto the damper shaft. A refined hydromechanical model of the MRSA under both cyclic and impact loadings is developed and validated using the measured test data. This ratedependent, mechanisms-based model predicts the time response of the MRSA under both loading conditions. The hydromechanical analysis marks a significant improvement over previous linear models. Key design considerations for the MRSA to accommodate both vibration and shock spectra using a single MR device are presented.

Paper Details

Date Published: 10 April 2010
PDF: 12 pages
Proc. SPIE 7643, Active and Passive Smart Structures and Integrated Systems 2010, 764312 (10 April 2010); doi: 10.1117/12.848724
Show Author Affiliations
Andrew Becnel, Univ. of Maryland, College Park (United States)
Wei Hu, Univ. of Maryland, College Park (United States)
Gregory J. Hiemenz, Techno-Sciences Inc. (United States)
Norman M. Wereley, Univ. of Maryland, College Park (United States)


Published in SPIE Proceedings Vol. 7643:
Active and Passive Smart Structures and Integrated Systems 2010
Mehrdad N. Ghasemi-Nejhad, Editor(s)

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