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The (a) x-axial; (b) y-axial; (c) z-axial time-domain-based vibration signals received by using the system in milling processes. The corresponding (d) x-axial (e) y-axial (f) z-axial frequency-domain-based vibration signals for “idle” and “milling” statuses in milling processes. These frequency-domain results are obtained by applying Fast-Fourier Transform to (a), (b), and (c), respectively.
