Design of a LQG controller for a vehicle active suspension system based on AHP

Based on analytic hierarchy process(AHP),a linear quadratic and Gaussian distributed(LQG) controller for active suspension was designed,it could depress body acceleration(BA),suspension working space(SWS) and dynamic tyre displacement(DTD).A 2-DOF dynamic model of a 1/4 vehicle passive and active suspension was firstly established.Then,weighted coefficients of all performance evaluation indicators were determined by adopting AHP and a LQG controller for a vehicle active suspension system was designed by using the optimal control theory.Finally,the model was simulated and analyzed under Matlab/Simulink environment.The comparision of simulation results illustrated that with proper selection of weighted coefficients,the BA,SWS and DTD of the active suspension are 18.73%、22.22% and 4.76% lower than those of the passive one,the RMS of active control force is 535.3994 N.