Analysis and semi-active control of rigid-flexible coupled system on vehicle

The control of the response of a quarter vehicle-mounted rigid-flexible coupled system based on the Euler-Bernoulli beam is considered. Dynamical model of whole rigid-flexible coupled system is built in this paper. LQR optimum control and H_∞ robust control in combination was applied to the whole coupled model, in which the optimum control force was determined by optimizing the weighting sum of the energy of the flexible body vibration response and dampers actuating force, using the weighting sum of the rigid body vibration velocity and the actuator input energy of rigid body subsystem as target, a H_∞ controller is designed and simulated. The simulation results show that the proposed active vibration isolation method can reduce rigid body vibration level and inhibit the flexible modal excitation more effectively compared with passive control strategy and the independently control method of two subsystems.