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This paper proposes an analytical design method for the linear multivariable non-square systems with multiple time delays and nonminimum-phase zeros. Based on Internal Model Control (IMC) theory, a multivariable non-square controller of full matrix form is designed for the non-square processes. In the controller design procedure, a simple method is presented to factor the transfer function matrix...
A new two degree-of-freedom decoupling control scheme is proposed for Two-by-two systems with multiple time delays and integrators. Its' main feature is that the disturbance responses are decoupled from the set-point responses. Firstly an inverse model based decoupler is proposed. Then the set-point tracking controller is analytically derived in terms of the H2 performance specification. The controller...
In this paper, a recently proposed multivariable Smith predictor scheme is modified, which leads to the remarkable improvement of regulatory capacity for both servo and regulatory performance. In the proposed scheme, a disturbance estimator is utilized to construct the closed-loop between the plant inputs and outputs for load disturbance rejection. As a result, the nominal set-point responses are...
It is difficult to identify the unstable processes with time delay, especially with large time delay. In this paper, a new relay feedback identification method for open-loop unstable processes with time delay is proposed. The exact expressions for the periods and amplitudes of limit cycles under the biased relay feedback are derived for unstable processes which can be modeled by first-order plus dead-time...
In this paper, an analytical two-degree-of-freedom control method is proposed for linear systems with time delay, including stable, unstable and nonminimum-phase plants of arbitrary order. The reference models for setpoint response and disturbance response are first presented, respectively, by virtue of dynamical characteristic of the control system and internal stability conditions. Then, the controllers...
To guarantee a deterministic transfer delay for cyclic control data in switched industrial Ethernet, the IEEE 802.1p queuing feature is introduced into Ethernet switches and source nodes, which gives real-time data the priority to access network resources. And simultaneously a leaky bucket regulator is also introduced into source nodes to constrain the traffic entering into the network, which prevent...
In this paper, we investigate the robust passivity problem for a class of uncertain singular systems with state delay. A sufficient condition for which the uncertain singular system with state delay is regular, impulse free and robust asymptotically stable for all admissible uncertainties is provided in terms of a linear matrix inequality. In addition, we also give procedures to design control law...
The goal of this brief is to provide a solution to the optimal design problem of decoupled multivariable Smith Predictor for general linear stable plants with multiple time delays. The design procedure is divided into three steps. In the first step, a nonsquare plant is factored into the "delay free" part and delay part, and the "delay free" part is further factored into minimum...
The Hinfin PID controller has been analytically developed on the basis of modern Hinfin optimal control theory and it can be tuned by only one control parameter in terms of given quantitative performance and robustness. This paper considers the problem of stabilizing a stable process with time delay using the Hinfin PID controller of this kind. Making use of the extended Hermite-Biehler theorem applicable...
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