Authors:
Carsten W. Scherer,
Volume: 1, Page 5204 Paper number 1520
Abstract:
For generalized plants with a specific structure we provide in this
paper solutions of decentralized H-infinity-controller design problems
by convex optimization without any conservatism. We apply our framework
to multi-objective control problems with time-domain and exact disturbance
decoupling constraints and to the problem of designing robust controllers
against uncertain stochastic disturbances.
Authors:
Julio Muñoz,
Volume: 1, Page 5210 Paper number 12
Abstract:
This paper is concerned with the obtainment of generalized optimality
conditions for a kind of nonlocal variational problems.
Authors:
Jorge Cortés,
Sonia Martínez,
Volume: 1, Page 5216 Paper number 9027
Abstract:
We study the optimal control problem for nonholonomic systems with
symmetry. This work is motivated by the idea of taking advantage of
the geometric structure exhibited by the optimal equations to integrate
them.
Authors:
Georg Schneider,
Kartik B. Ariyur,
Miroslav Krstić,
Volume: 1, Page 5219 Paper number 9705
Abstract:
Attenuation of thermoacoustic instabilities by active control has lately
received considerable attention. Many experimentally successful endeavors
have used phase-shifting controllers feeding back a phase-shifted/time-delayed
version of the dominant harmonic of acoustic oscillations through appropriate
actuation (loudspeakers or fuel flow modulation). The phase-shifters
are tuned by trial and error to produce a minimum oscillation amplitude.
Hence, for widespread practical application of these controllers, there
exists a need for adaptive tuning of the phase-shift to produce a minimum
oscillation amplitude in a dynamic environment. The present simulation
study demonstrates the efficacy of the extremum seeking algorithm and
a modified version in optimally tuning the phase-shift in a model of
a controlled combustion process identified from data. Step and ramp
changes in the optimal phase-shift are successfully tracked, and oscillation
amplitude kept at its minimum value.
Authors:
Q.H. Nguyen,
Q.P. Ha,
D.C. Rye,
Hugh F. Durrant-Whyte,
Volume: 1, Page 5224 Paper number 2160
Abstract:
This paper presents the sliding mode axis control of the electrohydraulic
servo systems of a robotic excavator. The dynamic systems are described
by a comprehensive model that accounts for nonlinearities and friction
effects of asymmetric hydraulic cylinders. A sliding mode controller
is developed for the electrohydraulic actuator of each working axis
to provide stable force tracking. With a proper choice of the reference
force, the control law can also allow tracking of a desired piston
displacement trajectory. Numerical simulation demonstrates the validity
of the proposed technique. Experimental results show good performance
and strong robustness in both force and position following.
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