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Article
Disturbance Suppression and Contour Following Accuracy Improvement: An Adaptive PI-Type Sliding Mode Nonlinear Extended State Observer Approach
The main idea behind the conventional extended state observer is that the total disturbance including nonlinearity, modeling error, and external disturbance, etc., is regarded as an augmented state variable wh...
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Article
Open AccessPrefrontal high definition cathodal tDCS modulates executive functions only when coupled with moderate aerobic exercise in healthy persons
Transcranial direct current stimulation (tDCS) is a promising tool to enhance cognitive performance. However, its effectiveness has not yet been unequivocally shown. Thus, here we tested whether coupling tDCS ...
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Article
Gradient-Descent-Based Velocity Observer with a Residual Displacement Term for ILSMC in Contour Following Applications
Industrial applications such as pick-and-place tasks and CNC machining often involve repetitive motions that may contain periodic disturbances. Due to the periodic nature of these applications, the idea of ite...
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Article
Design and analysis of a single-phase low-frequency active power factor correction circuit: a symmetric trapezoidal current waveform approach
This paper focuses on the design and analysis of the single-phase Low-Frequency Active Power Factor Correction (LFAPFC) circuit. The LFAPFC circuit has several attractive features such as low electromagnetic i...
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Article
Vision-based Pythagorean hodograph spline command generation and adaptive disturbance compensation for planar contour tracking
Many control problems encountered in industrial applications such as deburring, cutting, and polishing are required to simultaneously perform force control and contour following. If the mathematical model of t...
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Article
High-speed contouring control with NURBS-based C2 PH spline curves
This paper presents a C2 Pythagorean hodograph (PH) spline curve constructed by the non-uniform rational B-spline (NURBS) curve for high-speed contouring control. With the knot vector, weights, and control points...
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Article
Contouring accuracy improvement using a tangential contouring controller with a fuzzy logic-based feedrate regulator
In contour-following tasks, contour error reduction is an issue of much concern. Generally speaking, contour error is caused by the mismatched dynamics between each axis. To reduce the contour error, many prev...
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Article
On Non-Uniform Rational B-Splines Surface Neural Networks
A novel bi-variate non-uniform rational B-splines (NURBS) surface neural network consisting of four hidden layers is proposed in this paper. The blending functions are selected as the activation functions for ...
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Article
Analysis and experiments of iterative learning-control system with uncertain dynamics
An iterative error compensation approach is proposed in this article to improve the accuracies of high speed, computer-controlled machining processes. It is well known that the high-speed computer-numerically-...
