1,721,193 research outputs found
Inversion-based feedforward actions in a ratio control system
No full textIn this paper we propose a new ratio control architecture that exploits the use of inversion-based feedforward actions to achieve a fast set-point step response while keeping the required ratio between two process variables. The recently developed ratio tracking station is then achieved to increase the robustness of the system. A user design parameter allows the selection of the trade-off between the settling time of the step response and the performance in keeping the desired ratio. Simulation results demonstrate the effectiveness of the method
Optimal inversion-based control for the set-point regulation of nonminimum-phase uncertain scalar systems
No full textA Noncausal Approach for PID Control
No full textA new approach for the improvement of the set-point following performances achieved by a PID controller is presented. Basically, it consists of applying a suitable command signal to the closed-loop control system in order to achieve a desired transient response when the process output is required to assume a new value. This command signal is determined by means of a stable input–output procedure for which a closed-form solution is presented, thus making the technique suitable to implement in the industrial context. Simulation and experimental results show that high performances are obtained despite the presence of model uncertainties and, above all, almost independently on the PID tuning. Thus, the PID gains can be selected in order to guarantee good load rejection performances without impairing the set-point transient responses
A simple technique to improve the set-point following performance of Predictive Functional Control
No full textIn this paper we present a simple technique to improve the set-point following performance of the basic Predictive Functional Control algorithm. The technique is based on a first-order-plus-dead-time model of the process and on a suitable selection of the set-point signal, so that a process variable transition from a steady-state value to another one is achieved in a predefined time interval. The additional design effort, which is practically negligible, is discussed. Illustrative examples are given to demonstrate the effectiveness of the proposed solution
Optimal system inversion based motion planning for servosystems with elastic transmission
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