Energy transfer in semi-active suspension

This paper investigates the effect of unintended high frequency excitations generated by the semi-active sky-hook control algorithm on the isolation properties of a car suspension. Using a quarter car model, the energy transfer from low to high frequency is established. To decrease the effect of these excitations, an elastic mount of the semi-active actuator (using rubber bushing at both of its ends) is investigated. The results presented show that the rubber bushing can play a role of mechanical filter, improving the isolation performances of the semi-active suspension at high frequency.