In this note, we consider a model of metal detector consisted of one transmitting loop, receiving loop and compensating loop. For distortion of the received signal is associated with the frequency of the transmitting signal through researching of mathematical model, it is feasible to increase the frequency of the detection signal to improve the sensitivity of metal detectors in order to meet food safety requirements. Feasibility of the system has been proved.Keywords-food industry; metal detectors; high frequency detecting signal I.
In view of parameter uncertainty in the magnetic levitation system, the adaptive controller design problem is investigated for the system. Nonlinear adaptive controller based on backstepping is proposed for the design of the actual system with parameter uncertainty. The controller can estimate the uncertainty parameter online so as to improve control accuracy. Theoretical analysis shows that the closed-loop system is stable regardless of parameter uncertainty. Simulation results demonstrate the effectiveness of the presented method.
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