Modified Optimal Algorithm for Active Structural Control.
Modified Optimal Algorithm for Active Structural
Sadek, F.; Mohraz, B.
NISTIR 5782; 29 p. January 1996.
Available from: National Technical Information Service
Order number: PB96-165949
building technology; active control; control algorithms;
optical control; structural dynamics
This study presents a modification to two linear optimal
control algorithms, namely classical and instantaneous,
to achieve a greater reduction in structural
displacements and control forces. The modification
consists of building a library of gain matrices and
selecting the gain matrix that would result in the
maximum control force without exceeding the control
system capacity. The modification was used to compute
the response of several single-degree-of-freedom (SDOF)
systems, a multi-degree-of-freedom (MDOF) system, and a
base isolated structure. Based on the examples
considered, the modification results in a reduction of
up to 45% in the peak control forces and structural
displacements as compared to existing algorithms. The
study shows that the external excitation influences the
selection of the control system parameters such as
controller capacity and gain matrices. These
parameters, therefore, should be determined according to
the seismic excitation intensity expected at the site.