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Frequency responses of single and multiple partial pipeline blockages / Pranab K. Mohapatra in Journal of hydraulic research, Vol. 49 N° 2 (Mars/Avril 2011) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 49 N° 2 (Mars/Avril 2011) . - pp. 263-266 Titre : Frequency responses of single and multiple partial pipeline blockages Type de document : texte imprimé Auteurs : Pranab K. Mohapatra, Auteur ; M. Hanif Chaudhry, Auteur Année de publication : 2011 Article en page(s) : pp. 263-266 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Frequency  domain  Periodic  flow  Pipe  blockage  Pipe  flow  Piping  system Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : The discrete Fourier transform (FT) of the peak pressure frequency response (PPFR) at a downstream valve generated by the transfer matrix method is used to detect a partial pipeline blockage. The location of this blockage is detected by locating the peak in the FT of the PPFR. This is also valid if multiple partial blockages are present. A methodology to detect individual blockage sizes is presented for single and double partial blockages. Yet, the present methodology is unsuccessful to predict the individual sizes if there are more than two partial blockages. However, the combined size of the partial blockages is detected by the magnitude of the zeroth frequency. In addition, special cases of partial blockage are presented to indicate the limitations of the present methodology. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2010.544887 [article] Frequency responses of single and multiple partial pipeline blockages [texte imprimé] / Pranab K. Mohapatra, Auteur ; M. Hanif Chaudhry, Auteur . - 2011 . - pp. 263-266. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 2 (Mars/Avril 2011) . - pp. 263-266 Mots-clés : Frequency  domain  Periodic  flow  Pipe  blockage  Pipe  flow  Piping  system Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : The discrete Fourier transform (FT) of the peak pressure frequency response (PPFR) at a downstream valve generated by the transfer matrix method is used to detect a partial pipeline blockage. The location of this blockage is detected by locating the peak in the FT of the PPFR. This is also valid if multiple partial blockages are present. A methodology to detect individual blockage sizes is presented for single and double partial blockages. Yet, the present methodology is unsuccessful to predict the individual sizes if there are more than two partial blockages. However, the combined size of the partial blockages is detected by the magnitude of the zeroth frequency. In addition, special cases of partial blockage are presented to indicate the limitations of the present methodology. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2010.544887