| Research Support Tool |
||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Context
Structural Control Using Regenerative Force Actuation Networks
Title:
Structural Control Using Regenerative Force Actuation Networks
Archive:
Earthquake Engineering
Author(s):
Scruggs, Jeffrey T.
Date:
2004-06-01
Abstract:
A Regenerative Force Actuation (RFA) Network consists of multiple electromechanical
forcing devices distributed throughout a structural system and actuated in such a way as to reduce
the response of the structure when subject to an excitation. The associated electronics of the
devices are connected together such that they are capable of sharing electrical power with each
other. This makes it possible for some devices to extract mechanical energy from the structure,
while others re-inject a portion of that energy back into the structure at other locations. The
forcing capability of an RFA network is constrained only by the requirement that in the aggregate
the total network must always dissipate energy.
The electromechanical currents generated by RFA networks must be controlled to create
the desired structural forces. This control is facilitated by the alternation of a multitude of powerelectronic
transistor switches in the electrical network. In this study, a sliding-mode switching
controller is proposed for realizing zero-error force command tracking. It is shown that
parameter uncertainty is a critical issue for force commands which require the network to operate
near its optimum transmissive efficiency.
RFA networks can be used to create velocity-proportional damping forces in structures.
However, unlike traditional structural damping, RFA networks have the ability to create non-local
and asymmetric damping forces. It is shown that this more generalized damping capability can
lead to significant improvements in the forced response of a structure, as compared with
traditional linear damping.
RFA networks may also be used for feedback control. In this context, the forcing
capability of the RFA network is constrained by its physical limitations. In this study, a
systematic method of nonlinear control design called ?Damping-Reference? control is proposed,
which guarantees a certain level of quadratic performance for the structural response. Variants of
the control law synthesis are proposed for quadratic regulation, stochastic control, and H¥ control
contexts.
These ideas are illustrated in the context of earthquake engineering through a simulation
example, involving a three-story structure with a two-actuator RFA network installed. In this
example, it is shown that the ?power sharing? nature of the RFA network has a significant
influence on the response.
forcing devices distributed throughout a structural system and actuated in such a way as to reduce
the response of the structure when subject to an excitation. The associated electronics of the
devices are connected together such that they are capable of sharing electrical power with each
other. This makes it possible for some devices to extract mechanical energy from the structure,
while others re-inject a portion of that energy back into the structure at other locations. The
forcing capability of an RFA network is constrained only by the requirement that in the aggregate
the total network must always dissipate energy.
The electromechanical currents generated by RFA networks must be controlled to create
the desired structural forces. This control is facilitated by the alternation of a multitude of powerelectronic
transistor switches in the electrical network. In this study, a sliding-mode switching
controller is proposed for realizing zero-error force command tracking. It is shown that
parameter uncertainty is a critical issue for force commands which require the network to operate
near its optimum transmissive efficiency.
RFA networks can be used to create velocity-proportional damping forces in structures.
However, unlike traditional structural damping, RFA networks have the ability to create non-local
and asymmetric damping forces. It is shown that this more generalized damping capability can
lead to significant improvements in the forced response of a structure, as compared with
traditional linear damping.
RFA networks may also be used for feedback control. In this context, the forcing
capability of the RFA network is constrained by its physical limitations. In this study, a
systematic method of nonlinear control design called ?Damping-Reference? control is proposed,
which guarantees a certain level of quadratic performance for the structural response. Variants of
the control law synthesis are proposed for quadratic regulation, stochastic control, and H¥ control
contexts.
These ideas are illustrated in the context of earthquake engineering through a simulation
example, involving a three-story structure with a two-actuator RFA network installed. In this
example, it is shown that the ?power sharing? nature of the RFA network has a significant
influence on the response.
Index terms:
Discipline(s):
Earthquake Engineering Research Laboratory
Subject(s):
Method/Approach:
NonPeerReviewed
Coverage:
Publisher:
Earthquake Engineering Research Laboratory
Contributors:
Source:
Language:
Relation:
http://caltecheerl.library.caltech.edu/379/01/EERL2004-09_1.pdf
Type:
Monograph
Format:
application/octet-stream
application/octet-stream
application/octet-stream
Copyright Information:
Browse Archive