Computer-controlled systems (3rd ed.)
Computer-controlled systems (3rd ed.)
Digital Control of Dynamic Systems
Digital Control of Dynamic Systems
Control System Design
Digital Control Systems: Design, Identification and Implementation (Communications and Control Engineering)
Unmanned helicopter flight controller design by use of model predictive control
WSEAS TRANSACTIONS on SYSTEMS
Optimal power capturing of multi-MW wind generation system
WSEAS TRANSACTIONS on SYSTEMS
Construction and operation of a knowledge base on intelligent machine tools
WSEAS TRANSACTIONS on SYSTEMS
Configurable digital fractional order hold device for hybrid control systems
ICC'08 Proceedings of the 12th WSEAS international conference on Circuits
Optimal adjustment of Fractional-Order Hold circuits
MIC '08 Proceedings of the 27th IASTED International Conference on Modelling, Identification and Control
Designand synthesis of a configurable fractional order hold dice for sampled-data control systems
WSEAS Transactions on Circuits and Systems
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In digital control, discrete-time signal reconstruction is usualy carried out by the zero-order hold (ZOH), although other options exist which exhibit interesting properties. A remarkable alternative is the fractional-order hold (FROH), which provokes no intersample ripple under steady state and, if properly tuned, can often place the discretized plant model z-domain zeros in more convenient locations than the ZOH. This zero placing technique, in turn, gives rise to closed-loop performance improvements for many cases. However, since it is formulated in the z-domain, it cannot anticipate continuous-time closed-loop behaviour. Besides, going through zero placement is burdensome, especially for high-order models. This work presents a new and simpler method which directly links the tuning of the FROH with some desired closed-loop features, bypassing zero placement. It is based on the frequency domain, which makes it possible to capture the continuous-time behaviour. The simulations performed have shown clear improvements over zero placement, in terms of time-domain performance figures, intersample behaviour, and the energy consumed in step responses.