A novel virtual phase calibrating model plane method for coordinate calibration in fringe projection profilometry is presented in this paper. Plane (X-axis and Y-axis) calibration and height (Z-axis) calibration are studied respectively. The virtual phase calibrating model plane method is designed to calibrate the coordinates. Experimental results show that the proposed calibration procedure using the virtual phase calibrating model plane method is more efficient in that it needs only to grab and process one series of images of the model plane, whereas the traditional calibration method requires at least two series of images.

In this paper, an anti-disturbance output feedback dynamic surface control (DSC) method is proposed for the position tracking of interior permanent magnet synchronous motor subject to unknown nonlinearities and time-varying disturbances. Specifically, a nonlinear extended-state-observer (NLESO) based on exponential functions is designed to estimate the total disturbance composed of system uncertainties and external disturbances. Then, by compensating for the total disturbance via the NLESO, an anti-disturbance output feedback law is designed based on the DSC approach. The salient features of the proposed approach is twofold. First, the total uncertainty including internal and external disturbances can be accurately estimated by an NLESO in real time. Second, the desired anti-disturbance performance of the servo control system can be achieved regardless of the position measurement only. The stability of the closed-loop control system is proved by using the cascade theory and input-to-state stability theory. Both simulation and experiment results are conducted to illustrate the effectiveness of the proposed control method.

Short-circuit faults are the most serious faults in a fault-tolerant permanent magnet AC motor drive with redundancy. In this paper the effect of short-circuit faults on the output electromagnetic torque and torque ripple is examined and the fault analysis shows that the output torque will be reduced significantly and the torque ripple will be increased after shortcircuit faults. One fault remedial strategy is proposed to compensate the torque loss due to the short-circuit faults. The experimental setup is developed and the experimental results are provided to verify the analysis results and the validity of the proposed fault remedial strategy.

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in this paper, we build a virtualization platform based on double-FlowVisors in multiple domains Production Network to abstract the underlying hardware and provision unified API to the APPS in application layer, which can increase resource utilization rate and reduce blocking probability. As a proof of concept, we implement an experimental scenario dealing with virtualization in multiple domain networks. Experimental demonstration is conducted with results of 5-9% blocking probability reduction and 10-15% resource utilization rate increasement.