Optimum Parameter of a Viscous Damper for Seismic and Wind Vibration

Determination of optimal parameters of a passive 
control system device is the primary objective of this study. 
Expanding upon the use of control devices in wind and earthquake 
hazard reduction has led to development of various control systems. 
The advantage of non-linearity characteristics in a passive control 
device and the optimal control method using LQR algorithm are 
explained in this study. Finally, this paper introduces a simple 
approach to determine optimum parameters of a nonlinear viscous 
damper for vibration control of structures. A MATLAB program is 
used to produce the dynamic motion of the structure considering the 
stiffness matrix of the SDOF frame and the non-linear damping 
effect. This study concluded that the proposed system (variable 
damping system) has better performance in system response control 
than a linear damping system. Also, according to the energy 
dissipation graph, the total energy loss is greater in non-linear 
damping system than other systems.