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Real-time estimation and differentiation of signals are common tasks in diverse applicationsof active vibration control. In this paper, an asymptotic approach for signal differentiation isapplied in an active vehicle suspension system. The synthesis of the differentiation approachevades the use of a mathematical model of the suspension system. Estimation of unknownexogenous disturbances due to irregular road surfaces are also estimated. Estimates of timederivatives of the output variable and disturbances are then used for the implementation of anactive vibration control scheme. Some numerical results are provided to show the effectivenessof the real-time estimation of the unavailable signals as well as a reasonable vibration attenuationlevel on a linear quarter-vehicle active suspension system.

Active Vibration Control, Vehicle Suspension System, Differential Flatness, Signal Differentiation, Disturbance Rejection.