“…Recently the auto-associative kernel regression (AAKR) method has been developed as a similarity-based model (SBM) for condition monitoring and fault alerting in largescale turbomachines (Garvey 2007, Di Maio 2013, Fei 2015, Sairam 2016, Yu 2017, Guo 2011, Brandsaeter 2017, Qian 2018, Baraldi 2015. This approach utilizes multivariate historical data collected at normal conditions to establish a system identification model representing the Weijian Tang et al This is an open-access article distributed under the terms of the Creative Commons Attribution 3.0 United States License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.…”