Transfer Of Power Flow And Optimal Control Strategy For The Active Suspension Of The Road Vehicle

Active suspension can adjust and generate the adaptive control force according to the varied surroundings and the body status. It has become one of the important subjects in the field of vehicle suspension. Based on the new thought of energy flow, which has been developed and used widely for vibration and noises control in recent years, this dissertation studies systematically the subject on vibration control of active vehicle suspension from the viewpoint of energy strategy. The main contents and contributions in the dissertation are as follows:Mathematics models of the 2 degree-of-freedom and the 4 degree-of-freedom suspension systems are established, respectively. On the basis of the models, the kinetic properties of the frequency domains in passive and sky-hook suspension systems are investigated theoretically. And the impacts of the passive and skyhook damping on the systems are discussed, respectively.The theory of power flow is introduced into vehicle suspension system, vibration characteristic, energy distributing and transfer are examined, and this provides a valid and synthetical approach for the design of low-power active suspension. The results show that power flow can embody the energy distribution and transfer of the system, and it has proven to be valid control 'strategy for the system.By using of substructure mobility synthetic technique, the expressions of power flow input suspension system and general dynamic transfer equations are derived, and then power flow optimal strategy is proposed. The results obtained by simulations of the system show the power flow into the system minimization strategies can obtain the excellent whole vibration control for the system, and the required energy will be reduced to the minimum. It is helpful to implement the low-power active system.