International Journal of Control, Vol.91, No.2, 297-319, 2018
Optimal robust control of nonlinear time-delay systems: Maintaining low operating errors during feedback outages
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 optimal controllers that keep operating errors below a specified bound for the longest time possible. Furthermore, it is shown that optimal performance can be approximated as closely as desired by using bang-bang controllers - controllers that are relatively easy to calculate and implement.