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In addition to positioning control, contour following control is also an important application of two-axis servomechanisms such as X-Y tables. Therefore, the reduction of contour following error so as to improve contour following accuracy is one of the important research topics for two-axis servomechanisms. Generally, the assessment of contour following accuracy is based on two error indices — tracking...
In this paper, a vision-based optical fiber alignment motion stage powered by piezo-actuator (PEA) is developed. However, the tracking performance of PEA is limited due to its inherent hysteretic nonlinearity and time varying parameters. In order to cope with this problem, a novel feedforward inverse hysteresis model based on B-spline approximation is adopted to eliminate the adverse effects due to...
Recently, a number of studies on encoding desired contour by velocity field have been reported. Since the constructed velocity field is a function of position only, the design of motion controllers for contour following can place emphasis on the reduction of contour errors rather than the reduction of tracking errors. However, very often a distance metric needs to be computed when constructing velocity...
The idea of velocity field control has recently been used to tackle contour following problems. Although promising results have been reported in previous studies, the contour to be followed used in those studies were not represented in the form of non-uniform rational B-spline (NURBS), which is the fundamental geometric representation in many CAD/CAM systems. In order to extend velocity field control...
To prevent from path command errors in CNC's motion control, performing "acceleration/deceleration before interpolation" (ADBI) motion planning on the desired feed rate profile is necessary. Although there are a few existing algorithms available for implementing ADBI, there is no clear choice in terms of contour error and machining efficiency. In this paper, a hybrid approach that takes...
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