Semi-active Control Of Variable Stiffness And
Damping Systems By The Pole-assignment
Method
Author(s)
F. Amini, R. Vahdani & B. Rahemi
Abstract
In recent studies the efficacy of semi-damper and semi-stiffness systems for
seismic response modification has been demonstrated both experimentally and
analytically. Variable stiffness devices can control only the displacement
response and have less effect on accelerations. In order to overcome this
limitation, in this study an innovative semi-active variable stiffness and damping
is used and the details of the procedure for application of continuous and impact
semi-active forces by pole assignment method is presented. The location of the
poles and the method of assigning poles to achieve the desired response have
been improved. The results are compared with LQR control. The feasibility of
the method is demonstrated by an example of story structure.
Keywords: semi active control, combination of variable stiffness and damping,
pole assignment method, discontinuous control forces.
1 Introduction
In the current decade, semi-active control of structures against earthquake
achieved by variable damping (especially by devices such as dampers containing
variable magnetic fluids and variable hydraulic dampers) and variable stiffness
device [1, 2]. Semi-active control systems are usually defined as a class of active
control systems whose needed potential energy is several times less than
ordinary active control systems [4]. Other advantages of the system can be
mentioned as: good function in reducing structure response, installing and
repairing costs less compared to other methods, stability of the system during its
time of function. Research efforts on controlling the structures have been
Keywords
semi active control, combination of variable stiffness and damping,
pole assignment method, discontinuous control forces.
Related Book
Other papers in this volume
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