In this paper, a quarter car test rig is utilized to perform an experimental study of the singlelink
variant of the Series Active Variable Geometry Suspension (SAVGS). A nonlinear model of the test
rig is identified with the use of a theoretical quarter car model and the rig’s experimental frequency
response. A linear equivalent modeling method that compensates the geometric nonlinearity is also
adopted to synthesize an H-infinity control scheme. The controller actively adjusts the single-link
velocity in the SAVGS to improve the suspension performance. Experiments are performed to evaluate
the SAVGS practical feasibility, the performance improvement, the accuracy of the nonlinear model and
the controller’s robustness.