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This work presents two applications of a novel tool developed for the approximate calculation of behavior in the domain of the frequency of Multirate Sampled-Data Control Systems. The cases presented here focus on the designing of digital regulators that operate with more than one sampling frequency, the aim being to stabilize the system in closed loop using relatively low sampling frequencies of...
It has been observed that the inclusion of Dual-Rate regulators in a sampled-data control loop occasionally introduces the phenomenon of intersample ripple in the output of the process being controlled. Several authors have offered explanations for this phenomenon which does not appear to derive from the control method. The aim of this brief report is to demonstrate that, by compensating in frequency...
A novel method for the approximation of the frequency response of a sampled data system is presented. Usually the frequency response calculation of sampled-data systems leads to use of the infinite dimension matrices of cumbersome mathematical treatment. The technique presented is based on the inclusion of a fictitious sampler in the continuous process output and on the signal flow analysis in the...
Nowadays, in industrial control applications, is rather usual to sample and update different variables at different rates, although it is common to consider all these activities equally and regularly spaced on time. These applications can be found, for example, on real-time operating systems by decomposing them into several tasks in such a way that pre-emption and blocking may appear due to task priorities...
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