OPTIMAL DESIGN of DAMPING DEVICES INSTALLED BETWEEN TWO ADJACENT PARALLEL STRUCTURES
A new vibration control system called two-structures connection system is presented in this paper. This new control system is composed of two adjacent parallel structures connected by active or passive control devices. For the sake of simplicity, this paper only addresses optimization procedures for viscoelastic damping devices installed between two adjacent parallel structures which are subjected to earthquake excitations and there are also no limitations on damping coefficients of viscoelastic damping devices. The optimal design of viscoelastic damping devices involves two aspects: parametric optimization and number and placement optimization. Based on the dynamic responses of the two-structures connection system in frequency domain, the optimal parameters of damping devices can be obtained by using NelderMead method in which the energy index of the two-structures connection system J is the object function. The optimal number and placement of damping devices can be obtained according to the performance index of control devices ΔJ which is also based on the dynamic responses of the twostructures connection system in frequency domain. The effectiveness of the optimization procedure is investigated and verified through a numerical example.