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In this paper time-domain analysis is performed for limit cycles in control loops that are induced by control valve stiction, and an analytical relationship between the proportional-integral controller parameters and the oscillation amplitude and period of process output is established. Based on this relationship, a novel controller design approach is proposed to achieve the desired oscillation amplitude...
Pneumatic control valves in practice are usually composed of three signal conversion processes that are associated with significant nonlinearities and dynamics. However, several physical, semi-physical, and data-driven models in the literature describe only one signal conversion process from the actuator force to the valve stem position. In this paper, a semi-physical model is proposed based on the...
Because of the inherent uncertainty, changeable, nonlinear characteristics, faults diagnosis is a very difficult task in the pneumatic actuator system. In addition, slow convergence speed exists in the original Elman network, so, a model, an improved Elman neural network, was presented to achieve fault diagnosis in this paper. The adjustable weights between the context units and output units are embedded...
In order to improve the time synchronization precision to insure the communication timely, several types of clock synchronization methods were compared, analyzed the IEEE1588 clock synchronization system, discussed the PTP system software programming, introduced some source code transplanting methods, got the root cause of the low precision, provided three major improving methods, tested the improved...
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