ABSTRACT
The properties of a viscous fluid damper (VD) are governed by a single parameter—the viscous gain. Choosing this gain is one of the fundamental tasks in VD control design. Guyan's method was used to reduce the number of DOFs to a manageable size. The damping matrix is determined from the reduced mass and stiffness matrices, based on a Rayleigh damping assumption. Many VDs design methods for seismically excited structures are based on the structure's response to a given earthquake record, either real or artificial. An optimal control problem definition of an excited plant requires some additional information regarding the excitation. In many control design methods, such as LQG and active control, the excitation is assumed to be a stochastic white-noise signal.
