- Conference date: 21–23 October 2009
- Location: Kuala Lumpur (Malaysia)
This paper describes the acoustic emission approach for internal surface roughness classification. Rough internal surface can be related to corrosion that usually occurred inside pipe. Two flow rates with different Reynolds number value are introduced in a pipe (smooth and rough internal surface) obstructed using normally available components (e.g.: valve). The time domain parameter of Acoustic Emission signals; peak amplitude and Root Mean Square (R.M.S) amplitude, at suitable location from the obstruction are obtained. Crest factor, C, which is defined as peak to RMS amplitude ratio was calculated in smooth pipe measurement compared to the crest factor in rough surface pipe measurement. It was observed that, at high flow rate measurement, crest factor value obtained can be used to successfully discriminate between rough and smooth internal surface roughness. For smooth internal surface pipe, the Crest Factor value is above than 4.0 at flow with Reynolds Number value above 40,000. Meanwhile for the C value below than 4.0, it can be classified as rough internal surface pipe.
- Rough surfaces
- Surface measurements
- Acoustic emission
- Reynolds stress modeling
- Acoustic analysis
Daniel Baumann, Mark G. Jackson, Peter Adshead, Alexandre Amblard, Amjad Ashoorioon, Nicola Bartolo, Rachel Bean, Maria Beltrán, Francesco de Bernardis, Simeon Bird, Xingang Chen, Daniel J. H. Chung, Loris Colombo, Asantha Cooray, Paolo Creminelli, Scott Dodelson, Joanna Dunkley, Cora Dvorkin, Richard Easther, Fabio Finelli, Raphael Flauger, Mark P. Hertzberg, Katherine Jones‐Smith, Shamit Kachru, Kenji Kadota, Justin Khoury, William H. Kinney, Eiichiro Komatsu, Lawrence M. Krauss, Julien Lesgourgues, Andrew Liddle, Michele Liguori, Eugene Lim, Andrei Linde, Sabino Matarrese, Harsh Mathur, Liam McAllister, Alessandro Melchiorri, Alberto Nicolis, Luca Pagano, Hiranya V. Peiris, Marco Peloso, Levon Pogosian, Elena Pierpaoli, Antonio Riotto, Uroš Seljak, Leonardo Senatore, Sarah Shandera, Eva Silverstein, Tristan Smith, Pascal Vaudrevange, Licia Verde, Ben Wandelt, David Wands, Scott Watson, Mark Wyman, Amit Yadav, Wessel Valkenburg and Matias Zaldarriaga
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