Optimal robust control of nonlinear time-delay systems: Maintaining low operating errors during feedback outages

HL Choi, J Hammer - International Journal of Control, 2018 - Taylor & Francis
The problem of maintaining low operating errors during feedback outages is considered for
a class of nonlinear systems with time-delays in the input channel. It is shown that there are …

Robust optimal control: low-error operation for the longest time

D Chakraborty, J Hammer - International Journal of Control, 2010 - Taylor & Francis
The problem of maximising the time during which an open-loop system can operate without
exceeding a specified error bound is considered for linear systems that are subject to …

Fastest recovery after feedback disruption: Nonlinear delay-differential systems

HL Choi, J Hammer - International Journal of Control, 2019 - Taylor & Francis
The problem of reducing operating errors after a feedback disruption is considered for a
class of nonlinear delay-differential systems. It is shown that there are optimal controllers …

Fastest recovery from feedback loss: Bounded overshoot

HL Choi, J Hammer - International Journal of Control, 2019 - Taylor & Francis
The problem of designing robust optimal controllers to reduce in minimal time operating
errors that had accumulated during a period of feedback loss is revisited, with the objective …

Optimal robust state-feedback control of nonlinear systems: Minimal time to target

J Hammer - International Journal of Control, 2021 - Taylor & Francis
The design of optimal robust state-feedback controllers that guide a system to a target in
minimal time is considered under constraints on the maximal input amplitude and the …

An approximate solution to the norm optimal control problem

D Chakraborty, C Shaikshavali - 2009 IEEE International …, 2009 - ieeexplore.ieee.org
The problem of finding the minimum input norm required to bring a dynamical system from
an arbitrary initial state to a given end-point constraint set under specified state constraints …

Control during feedback failure: Characteristics of the optimal solution

D Chakraborty, J Hammer - 2009 17th Mediterranean …, 2009 - ieeexplore.ieee.org
The problem of kee** performance errors within bounds while controlling a perturbed
open loop linear system is considered. The objective is to maximize the time during which …

Recovering in minimal time from feedback loss: bounded overshoots

HL Choi, J Hammer - 2018 Annual American Control …, 2018 - ieeexplore.ieee.org
When feedback is restored after a period of feedback loss, the problem is to reduce in
minimal time operating errors that may have accumulated during feedback absence. This …

Quick recovery after feedback loss: delay-differential systems

HL Choi, J Hammer - 2017 17th International Conference on …, 2017 - ieeexplore.ieee.org
Optimal controllers are developed for delay-differential systems. The objective is to reduce
operating errors as quickly as possible after feedback loss, once feedback has been …

Event-based control: a tutorial introduction

J Lunze - Journal of The Society of Instrument and Control …, 2010 - jstage.jst.go.jp
Event-based control is a new control methodology that aims at reducing the communication
flow within a control loop by closing the loop only after events have indicated a substantial …