Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/2666
Title: Effects of the pipe-joints on acoustic emission wave propagation velocity
Authors: Wichaidit, W
Au, YHJ
Keywords: Acoustic emission;Wave velocity;Copper pipe;Jointed-pipes;Wavelet packet decomposition
Issue Date: 2008
Publisher: Brunel University
Citation: The 6th International Conference on Manufacturing Research (ICMR08), Brunel university, UK, 9-11th September 2008. pp. 917-922
Abstract: In jointed-pipes, a variety of different acoustic emission (AE) waves can be generated by way of mode conversion, wave reflection and wave transmission from a joint. This can lead to interference waves as resulting complicated signals propagate along the pipe structure. To find out how the joint affects AE wave propagation in the jointedpipes, experiments were conducted on a thin-walled copper pipes connected with two types of joint, compression and soldered. By using wavelet packet decomposition (WPD) analysis and the time-of-flight method, the apparent velocity of AE waves near the joints could be estimated as a narrow frequency band individually. Results confirmed that the wave velocities determined near a joint were influenced by not only the wave reflection but also the wave transmission. The measured wave velocity was least affected by those for the wave in the low frequency band (<125 kHz). It was also observed that a compression or soldered joint behaved like a low-pass filter to the transmitted AE signal.
URI: http://bura.brunel.ac.uk/handle/2438/2666
Appears in Collections:Advanced Manufacturing and Enterprise Engineering (AMEE)
Dept of Design Research Papers

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