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Synchronization control is of great importance for grid-connected power converter so that precise phase angle information of the grid voltage is required. As three-phase grid voltages are imbalanced or distorted, Synchronous Reference Frame Phase-Locked Loop (SRF-PLL) aims to track fundamental frequency positive sequence with zero steady state error. The in-loop Cascaded Delayed Signal Cancellation...
Welding robots with strong robustness and high-precision trajectory tracking control play an important role in performing automatic welding processes under complex dynamic environments. This paper proposes a new variable structure control (VSC) based on multi-sliding-surface for welding robots with parameter uncertainties. The whole sliding-mode surface of VSC is divided into three sub-sliding-mode-surfaces...
Jumping robots provide an effective solution to overcome obstacles and perform locomotion in a rough and unstructured terrain. In this paper, an overview of jumping robots' principle, types, jumping and energy storage mechanism, uprighting mechanism, steering mechanism and models of kinematic and dynamic are presented. The existing technical problems and the future work are also discussed.
This paper presents an automatic feature extraction from insufficient JEM signals based on compressed sensing (CS) method. First, the CS method was employed to extract a refined spectrum from insufficient JEM signals. In the process of applying the CS method to JEM signals, we utilized the modified linear programming (LP) standard form of an optimization method. After converting the spectrum into...
With the development of the medical imaging and the imaging equipment, although medical image quality has been improved significantly, and the noise in the majority of images can not be identified artificially, the projection data in the actual scanning process is still interfered inevitably by various noise, and the traditional denoising method can't possess both of reducing image noise and retaining...
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