Modelling and Simulation of pH Neutralization Plant Including the Process Instrumentation

1-D Wavelet Signal Analysis of the Actuators Nonlinearities Impact on the Healthy Control Systems Performance

“…In Figure 33 are shown the results of the signals compression operation that follows the same three steps as in denoising case, a slightly difference in terms of the procedure is found only in step 2 that where two compression approaches are available [15]: In the first approach the wavelet signals are expanded and keep the largest absolute value coefficients; in this case, a global threshold, a compression performance, or a relative square norm recovery performance can be set [15]. Therefore, for this approach only a single signal-dependent parameter needs to be selected.…”

“…For simulation purpose the experimental setup for the pH neutralization process and the dynamic model coefficients are the same as in [15]. The tank layout is shown in Figure 3.…”

“…This is one of the stronger wavelets features to prove a high capacity to concentrate all signal energy in few coefficients [15].…”

“…pH concentration value, and level of the solution inside the neutralization reactor. [15] In Figure 9 is shown the SIMULINK model of the pHcontroller with a back-propagation windup reset to avoid the saturation of the integrator due to the saturation nonlinearity of the control valve actuator. In Figure 10 and Figure11 is shown in detail the PI level controller with a windup reset from the same raison as for PI pH-controller.…”

IDENTIFICAÇÃO CAIXA-CINZA MISO DE PLANTA DE NEUTRALIZAÇÃO DE pH EM MALHA FECHADA

“…Para esta identificação, a planta de neutralização de pH é representada por um modelo fenomenológico e a curva de titulação foi obtida a partir de [4].…”