The emergence of networked control systems urges the joint consideration of control and communications. It is well known that event-based controllers outperform standard timetriggered designs, when the transmission rate is constrained. This paper considers the design of suboptimal event-based controllers in the presence of packet loss and delayed acknowledgement for linear stochastic systems. T...

With the hard computation of an exact solution to non-convex optimization problem in a limited time, we propose a suboptimal min-max model predictive control (MPC) scheme for nonlinear discrete-time systems subjected to constraints and disturbances. The idea of input-to-state stability (ISS) is introduced and a Lyapunov-like sufficient condition for ISS is presented. Based on this, we show that...

In this paper, a continuous–time optimal control problem is approached in a sub–optimal way by introducing the concept of suboptimal value function, which is any function satisfying the Hamilton–Jacobi–Bellman inequality. It is shown that as long as the Euler Approximating System (EAS) of a given continuous–time plant admits a positive definite convex suboptimal value function, it is possibile ...

Telephone surveys describing suboptimal asthma control may be biased by low response rates. In order to obtain an unbiased assessment of asthma control and assess its impact in primary care, primary care physicians used a 1-page control questionnaire in 50 consecutive asthma patients. Of the 10,428 patients assessed by 354 physicians, 59% were uncontrolled, 19% well-controlled and 23% totally c...

Two simple feedback control laws for drag reduction are derived by applying a suboptimal control theory to a turbulent channel flow. These new feedback control laws require pressure or shear-stress information only at the wall, and when applied to a turbulent channel flow at Reτ = 110, they result in 16–22% reduction in the skin-friction drag. More practical control laws requiring only the loca...

The objective of this study is to develop a method of controlling vortex shedding behind a bluff body using control theory. A suboptimal feedback control procedure for local sensing and local actuation is developed and applied to the flow behind a circular cylinder. The location of sensors for feedback is limited to the cylinder surface and the control input from actuators is the blowing and su...

This paper describes a technique for planning collision-free, fuel-efficient paths and thruster controls for moving Sprint from an initial to a goal location and attitude among multiple obstacles. The planning problem is formulated as a nonlinear optimization problem whose parameters are the locations of control points of splines representing Sprint's path and the time interval between the cont...

Suboptimálne riadenie systému s oneskorením na vstupe implicitným modelom The stabilization by feedback control of systems with input delays may be considered in various frameworks. In this paper the problem of implicit model following for input delay systems via optimal control is approached. The optimal control is implemented by piecewise constant signals that make it suboptimal. The simulati...