Analysis of Structures Controlled with a New Variable Damping Semi-Active (VDSA) Device

Abstract eng:
A new semiactive device is proposed in this paper. It is composed of two fixed-orifice viscous fluid dampers installed in the form of V whose top ends are attached to the upper floor and their lower ends to a point that can move along a vertical rod. The mechanism is termed the Variable Damping Semi-Active (VDSA) device. By varying its position, an optimal instantaneous damping added to the structure to minimize the response is obtained. The position of the moving end of the device, an algorithm based on a variation of the Instantaneous Optimal control Theory and which includes a generalized LQR scheme. This modified algorithm, referred to as Qv, is based on the minimization of the performance index J quadratic in the state vector, the control force vector, and a vector of absolute velocity measured at selected points. Two variants of the algorithm are used to compute the seismic response of a single and a multi degree of freedom structure.

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