An optimal control strategy for the random vibration reduction of nonlinear structures using piezoelectric stack inertial\nactuator is proposed. First, the dynamic model of the nonlinear structure considering the dynamics of a piezoelectric stack\ninertial actuator is established, and the motion equation of the coupled system is described by a quasi-non-integrable-\nHamiltonian system. Then, using the stochastic averaging method, this quasi-non-integrable-Hamiltonian system is\nreduced to a one-dimensional averaged system for total energy. The optimal control law is determined by establishing and\nsolving the dynamic programming equation. The proposed control law is analytical and can be fully executed by a\npiezoelectric stack inertial actuator. The responses of optimally controlled and uncontrolled systems are obtained by\nsolving the Fokkerâ??Planckâ??Kolmogorov (FPK) equation to evaluate the control effectiveness of the proposed strategy.\nNumerical results show that our proposed control strategy is effective for random vibration reduction of the nonlinear\nstructures using piezoelectric stack inertial actuator, and the theoretical method is verified by comparing with the\nsimulation results.
Loading....