Laboratory Testing of an Active Electromagnetic Near Constant Force Suspension (NCFS)

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Weeks, D.A.
Beno, J.H.
Bresie, D.A.
Guenin, A.

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Society of Automotive Engineers, Inc.


In March of 1995, the University of Texas at Austin Center for Electromechanics (UT-CEM) began work on developing active suspension control algorithms for four-wheeled, off-road, rough terrain, vehicles. To serve as a test platform to validate simulations, a four corner test-rig, representing a military HMMWV at one third scale, was designed and fabricated. Multiwheel control algorithms were developed, based on single wheel concepts previously described in SAE publications. The four-wheel test-rig performance compared well with single wheel test-rig performance, showing that the active suspension concepts developed by UT-CEM, which do not require advanced terrain knowledge (i.e., no “look-ahead”), are compatible with full vehicle control.


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D.A. Weeks, J.H. Beno, D.A. Bresie, and A. Guenin, “Laboratory testing of an active electromagnetic near constant force suspension (NCFS), 1997 SAE International Congress and Exposition, Detroit, Michigan, U.S.A., February 24-27, 1997.