Massimiliano Veronesi

• PhD
• Business Development Manager at Yokogawa Italy

In this paper, we present tuning rules for PI controllers that represent an effective alternative to the well‐known lambda‐tuning for the load disturbance rejection task. In particular, the integrated absolute error is minimized subject to a constraint on the maximum sensitivity selected. Suitable formulas are given to relate the proposed tuning wi...

Lambda tuning is frequently employed for PI(D) controllers in the process industry because of its simplicity and intuitiveness for the user. In this paper we analyze the fundamental choice of the tuning parameter λ, that is, of the desired closed-loop time constant, by considering different trade-offs that can be posed by the user in the controller...

In this paper we propose a methodology to evaluate the performance of decentralized PID controllers for two-inputs-two-outputs processes and to retune the parameters. In particular, the model of the process is estimated based on a technique that exploits the final value theorem. Then, an evolutionary algorithm is applied in order to find the Pareto...

This paper presents new simple tuning rules for the gain in feedforward compensators. When the ideal feedforward controller is not possible to implement, a negative effect is introduced in the closed-loop response. So, the closed-loop transfer function from the disturbance to the error is analyzed and tuning rules for the feedforward gain are propo...

New techniques based on the application of the final value theorem to suitably devised signals have been recently proposed for the process parameters estimation, performance assessment and retuning of industrial (PID) controllers. The main features of these methods are that they can be applied in closed-loop and they can exploit routine operational...

This paper presents new simple tuning rules for the gain in feedforward compensators. When the ideal feedforward controller is not possible to implement, a negative effect is introduced in the closed-loop response. So, the closed-loop transfer function from the disturbance to the error is analyzed and tuning rules for the feedforward gain are propo...

New techniques based on the application of the final value theorem to suitably devised signals have been recently proposed for the process parameters estimation, performance assessment and retuning of industrial (PID) controllers. The main features of these methods are that they can be applied in closed-loop and they can exploit routine operational...

In this paper we present a new closed-loop automatic tuning methodology for decentralised proportional–integral–derivative (PID) controllers applied to two-inputs–two-outputs (TITO) non-singular processes. The main feature of the technique is the estimation of the process parameters by evaluating two closed-loop set-point step responses with two ro...

Performance assessment and retuning techniques for proportional-integral-derivative (PID) controllers are reviewed in this paper. In particular, we focus on techniques that consider deterministic performance and that use routine operating data (that is, set-point and load disturbance step signals). Simulation and experimental results show that the...

In this paper, a performance benchmark for the assessment of two feedforward control architectures for the load disturbance compensation problem is proposed. In particular, two indices are devised so that the advantage of using a feedforward compensator with respect to the use of a feedback controller only is quantified. Furthermore, these metrics...

In this paper, an automatic tuning methodology for a modified Smith predictor control scheme is proposed. The main feature of the procedure is that it is applied in closed-loop (by either evaluating a set-point or a load disturbance step response) and it is suitable for self-regulating, integral and unstable processes. Further, the process paramete...

We propose a method for the automatic tuning of the feedforward compensator for proportional-integralderivative control loops in order to reject disturbances acting on the process. The parameters of the compensator are automatically computed after estimating the disturbance transfer function by using closed-loop routine operating data. Simulation a...

In this paper we propose a method for the automatic design of the feedforward compensator for PID control loop where the process is affected by a disturbance. The parameters of the compensator are automatically computed after the disturbance is rejected for the first time by a simple PID controller which can be roughly tuned. Further, a technique t...

In this paper we propose an algorithm for the load disturbance rejection performance assessment of a PI(D) controller and for the retuning of the parameters in case the obtained response is not satisfactory. The technique can be applied simply by evaluating the load disturbance closed-loop response. The automatic tuning for a set-point filter is al...

Nel vasto campo del monitoraggio delle prestazioni dei sistemi di automazione un ruolo delicato è quello degli anelli di regolazione, più del 90% dei quali, in ambito industriale, sono presidiati dai regolatori di tipo PID (Proporzionale-Integrale-Derivativo) grazie a un rapporto costi/benefici potenzialmente soddiffacente per la maggior parte dei...

In this paper we propose an algorithm for the load disturbance rejection performance assessment of a PI(D) controller and for the retuning of the parameters in case the obtained response is not satisfactory. The technique can be applied simply by evaluating the load disturbance closed-loop response. The automatic tuning for a set-point filter is al...

In this paper we address the problem of finding the parameters of a PID controller in order to achieve the minimum variance performance. In particular, a global optimal solution is found by exploiting the analytic expression for the output variance as an explicit function of PID settings, and by using the DIviding RECTangles (DIRECT) algorithm, whi...

In this paper we propose a new automatic tuning technique for multiloop PID controllers applied to MIMO processes. The process parameters are estimated by employing simple closed-loop experiments (where roughly tuned PID controllers are in place), namely, by evaluating the response of the system to a sequence of set-point step signals (one for each...

A new automatic tuning method for cascade control systems is presented. The technique consists in estimating the parameters of the primary and secondary process simultaneously by evaluating a closed-loop set-point step response. Then, based on the estimated model, the two proportional-integral-derivative controllers are tuned by applying an interna...

Nell'ambito dell'automazione dei processi produttivi fondamentale importanza rivestono le tecniche di regolazione di grandezze fisiche quali pressioni, portate, temperature, livelli. Benché la teoria del controllo abbia proposto svariati e potenti approcci per affrontare i sistemi dinamici lineari e non, l'algoritmo PID (Proporzionale-Integrale-Der...

Il monitoraggio delle prestazioni degli anelli di regolazione rappresenta un passo importante verso il miglioramento e l’ottimizzazione del processo produttivo e della qualità dei prodotti. Tuttavia è poco efficiente monitorare manualmente le varie decine (se non centinaia) di anelli di regolazione e sarebbe viceversa opportuno poter disporre di te...

In this paper we propose a methodology for the performance assessment of a PID controller applied to an integral process and for the retuning of the parameters in case the obtained response is not satisfactory. The technique addresses both set-point and load disturbance step responses. Simulation and experimental results obtained with a laboratory...

In this paper we show how a simple methodology for the set-point following performance assessment and automatic tuning of a PI controller can be employed effectively in a real industrial application. In particular, a flow control loop in a pharmaceutical plant is considered. Practical issues related to the implementation in a Distributed Control Sy...

In this paper we present an automatic tuning methodology for PID controllers for distributed-lag processes. The technique is based on the evaluation of a closed-loop set-point or load disturbance step response and it can be therefore employed with process routine operating data. Further, a performance assessment index is also proposed in order to e...

In this article, we propose an algorithm for the set-point-following performance assessment of a PID controller and for the retuning of the parameters in case the obtained response is not satisfactory. The technique is based on the SIMC tuning rules and can be applied simply by evaluating a set-point step response. Simulation and experimental resul...

A simple technique for the detection of abrupt load disturbances occurring in process control systems is proposed in this paper. The technique is based on the computation of an index using routine operating data, after a simple experiment is performed initially, and it can be employed usefully in the context of performance assessment and adaptive c...

Nell’ambito della regolazione basata sugli algoritmi di tipo PID (Proporzionale-Integrale-Derivativo) l’azione derivativa, che pure potrebbe dare un prezioso contributo in termini di anticipo di fase, viene spesso disabilitata a causa della sua sensibilità al rumore sul segnale di misura che può causare un degrado delle prestazioni finanche a risul...

Il presente articolo fornisce gli elementi per valutare le prestazioni delle tecniche di ottimizzazione tipicamente proposte per la taratura dei regolatori Pid. I risultati delle principali, tra queste metodologie, vengono ripresi con una notazione unificata, per poi analizzarne le prestazioni in base a due parametri normalmente utilizzati per espr...

In this paper a new ratio control architecture is proposed. Differently from the ratio controllers proposed in the literature, this one aims at achieving satisfactory performances with respect to both set-point following and load disturbances rejection specifications. Tuning rules are provided, so that no significant design effort is required to th...

Il presente contributo si propone di illustrare il problema della regolazione di rapporto, che è quello di tenere sotto controllo la proporzione tra due sostanze in modo indipendente dalle singole concentrazioni. La soluzione del problema trova vasto impiego in ambito industriale, dalle applicazioni di miscelazione nei reattori chimici (“blending”)...

In this paper a new ratio control architecture is proposed. Differently from the ratio controllers proposed in the literature, this one aims at achieving satisfactory performances with respect to both set-point following and load disturbances rejection specifications. Tuning rules are provided, so that no significant design effort is required to th...

It is known that the classical tuning formula for typical Proportional-Integral-Derivative (PID) controllers in general provides unsatisfactory results for industrial plants where the time delay exceeds the dominant lag time. For this reason, alternative strategies have been studied in order to cope with this problem and, in this context, the most...

Questo libro rappresenta una trattazione introduttiva ma completa della logica fuzzy e delle sue applicazioni che, nel corso dell'ultimo ventennio, si sono diffuse dai sistemi di controllo e di supporto alle decisioni fino agli elettrodomestici di uso comune. Destinato prevalentemente ad un pubblico digiuno della materia, si tratta di un testo che...