Fault Identification in Pipeline System Using Normalized Hilbert Huang Transform and Automatic Selection of Intrinsic Mode FunctionHanafi M. Yusop, M.F. Ghazali, M.F.M. Yusof, M.A.Pi Remli and M. SamykanoMATEC Web Conf., 221 (2018) 02002DOI: https://doi.org/10.1051/matecconf/201822102002