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1887

access icon free Feature extraction using frequency spectrum and time domain analysis of vibration signals to monitoring advanced ceramic in grinding process

© The Institution of Engineering and Technology
Received 08/02/2017, Accepted 23/07/2018, Revised 30/04/2018, Published 06/08/2018

New alternatives for monitoring the ceramic grinding process have been studied. Monitoring vibration signals is one of the most successful methods because some characteristics that describe the behaviour and influence of the process on ground parts are only noticeable by studying such signals. This study aims to monitor the finishing of advanced ceramics during the surface grinding process via digital processing of the vibration signals. Experimental tests were performed using a surface tangential grinding machine with a diamond grinding wheel and alumina (Al2O3) test specimens. The vibration signal was measured by an accelerometer and recorded by an oscilloscope at a 2 MHz sampling rate. The tests were conducted at different depths of cut for two workpiece speeds (v w) under mild and severe machining conditions. Confocal microscopy and surface roughness Ra measurements were performed after grinding each workpiece to classify the samples. Digital signal processing was performed to achieve feature extraction. A frequency range of 800 Hz–2 kHz was most strongly related to the post-grinding ceramic condition. A correlation was found between vibration and integrity of the ceramic workpiece because the vibration signal was proportional to the surface roughness for each cutting depth used. To support the conclusion presented, a statistical analysis through variance by analysis of variance was performed.

Inspec keywords: alumina; grinding; feature extraction; diamond; optical microscopy; oscilloscopes; time-frequency analysis; accelerometers; statistical analysis; vibrational signal processing; production engineering computing; process monitoring; grinding machines; surface roughness; ceramics; machining; surface topography measurement

Other keywords: accelerometer; post-grinding ceramic condition; surface grinding process; severe machining conditions; Al2O3; alumina test specimens; diamond grinding wheel; C; confocal microscopy; surface roughness measurements; feature extraction; advanced ceramic grinding process monitoring; statistical analysis; surface tangential grinding machine; time domain analysis; workpiece speeds; vibration signals digital processing; frequency spectrum analysis; oscilloscope; mild machining conditions; frequency 800 Hz to 2 kHz; vibration signals monitoring

Subjects: Ceramics and refractories (engineering materials science); Statistics; Spatial variables measurement; Machining; Measurement; Mathematical analysis; Mathematical analysis; Industrial applications of IT; Other topics in statistics; General fabrication techniques; Digital signal processing; Production engineering computing; Vibrations and shock waves (mechanical engineering); Other topics in statistics; Engineering materials; Velocity, acceleration and rotation measurement; Signal processing and detection

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