Text Mining for Industrial Machine Predictive Maintenance with Multiple Data Sources

Abstract

This paper presents an innovative methodology, from which an efficient system prototype is derived, for the algorithmic prediction of malfunctions of a generic industrial machine tool. It integrates physical devices and machinery with Text Mining technologies and allows the identification of anomalous behaviors, even of minimal entity, rarely perceived by other strategies in a machine tool. The system works without waiting for the end of the shift or the planned stop of the machine. Operationally, the system analyzes the log messages emitted by multiple data sources associated with a machine tool (such as different types of sensors and log files produced by part programs running on CNC or PLC) and deduces whether they can be inferred from them future machine malfunctions. In a preliminary offline phase, the system associates an alert level with each message and stores it in a data structure. At runtime, three algorithms guide the system: pre-processing, matching and analysis: Preprocessing, performed only once, builds the data structure; Matching, in which the system issues the alert level associated with the message; Analysis, which identifies possible future criticalities. It can also analyze an entire historical series of stored messages The algorithms have a linear execution time and are independent of the size of the data structure, which does not need to be sorted and therefore can be updated without any computational effort.

Text Mining Framework for Predictive Maintenance in Manufacturing

“…Those maintenance records (mainly in text format) normally follow a set of template or guidance, containing a number of attributes such as record id number, asset id number, components, maintenance descriptions (or maintenance activity), cause of failure (if available). There are different types of data and approached to PdM [2][3][4][5][6][7][8][9]. However, in most of the cases, PdM applications use output data collected from sensors that record or monitor physical condition such as temperature or vibration which can be directly linked to the degradation process of the machine.…”