The simplicity of traditional regulators makes them popular and the most used solution in the nowadays industry. However, they suffer from some limitations and cannot deal with nonlinear dynamics and system parameters variation. In the literature, several strategies of adaptation are developed to alleviate these limitations. In this paper, we propose a combination of two strategies for PI parameters supervision and adaptation. We apply the obtained structure to the control of induction machine speed. Simulation and experimental results of the proposed schema show good performances as compared to two strategies

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Superfluid 3 He-B offers a unique example of level crossing, that of the zero-sound mode and the internal "real squashing" mode of the gap parameter. A full treatment of this classic problem is given which compares well with observations at 1.2 bars and 45 MHz. The characteristic beat pattern seen on-resonance is identified as a "07r-area" pulse, first discussed by Crisp. The present findings for the signal velocity agree with Brillouin's well-known predictions.