A fast and robust nonparametric monitoring scheme for free-form surface scanning data

K Wang, F Tsung - IEEE Transactions on Automation Science …, 2019 - ieeexplore.ieee.org
K Wang, F Tsung
IEEE Transactions on Automation Science and Engineering, 2019ieeexplore.ieee.org
The advance of new sensing technologies, such as the 3-D laser scanning, creates a data-
rich environment for quality control in modern industries. The free-form surfaces of complex
manufactured parts can be quickly scanned, producing thousands of data points. To monitor
these large-scale surface scanning data, three major challenges have to be solved
simultaneously: 1) simple parametric models are no longer sufficient to describe free-form
surfaces; 2) the massive data points need fast computations; and 3) the presence of outliers …
The advance of new sensing technologies, such as the 3-D laser scanning, creates a data-rich environment for quality control in modern industries. The free-form surfaces of complex manufactured parts can be quickly scanned, producing thousands of data points. To monitor these large-scale surface scanning data, three major challenges have to be solved simultaneously: 1) simple parametric models are no longer sufficient to describe free-form surfaces; 2) the massive data points need fast computations; and 3) the presence of outliers calls for robust analytics. To fulfill this task, this paper proposes a novel monitoring scheme where the control chart is designed based on a new robust bilateral kernel smoothing method. A fast approximation algorithm is also developed for efficient online monitoring. This fast and robust nonparametric control chart shows significant superiority for surface monitoring in our numerical simulations. Finally, a real case study demonstrates the effectiveness of our proposed scheme in monitoring the stability of a 3-D printing process.
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