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To extract the trend of condition monitoring data set effectively, piecewise linear representation is one of the most potential strategies. A new trend feature extraction method is presented based on the local maximum minimum and slope in this paper. The results of experiments are shown that it can extract the multiscale of trend feature and ensure acceptable fitting error. The process of extracting trend feature focuses on identification of rules and patterns and discovering the relevant and interesting information from condition monitoring system. It can provide a certain reference for condition trend analysis.

Trend Feature Extraction in Condition Monitoring by a New Piecewise Linear Representation Method