A design method for the decentralised time-varying discrete-time output-feedback control of linear time-invariant plants with unstable unstructured decentralised fixed modes (UDFM) is introduced. The design method use...
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A design method for the decentralised time-varying discrete-time output-feedback control of linear time-invariant plants with unstable unstructured decentralised fixed modes (UDFM) is introduced. The design method uses generalised sampled-data hold functions to eliminate the UDFMs and to decouple the discrete-time equivalent model of the plant into independent input-output channels. Through this structural change, the plant becomes suitable for a stabilising high-sampling-rate controller that induces two-time-scale motions (TTSM) in the closed-loop system. As a result, the discrete-time controller is likewise decoupled into distinct local agents and the TTSM closed-loop system is decentralised.
In this paper it is shown that Iterative Feedback Tuning can be applied to multi-input multi-output linear sampled-data systems where the sensed outputs may be sampled at different rates and where the controllers oper...
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In this paper it is shown that Iterative Feedback Tuning can be applied to multi-input multi-output linear sampled-data systems where the sensed outputs may be sampled at different rates and where the controllers operate synchronously at one sampling rate which is a multiple of the sampling rates of the controlled variables. It is also shown that generalized sampled-data hold functions (GSDHF) can be tuned. By way of an example, it is shown that one case where GSDHF's may improve the performance significantly is when the continuous time system is minimum phase but the sampled counterpart is non-minimum phase.
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