3. RUL estimation methods for intelligent predictive maintenance

Intelligent predictive maintenance in Industry 5.0 is based on three pillars defined by the European Union:

• human-centered ;

• durable ;

• resilient.

This approach makes use of the technologies and data processing methods emerging from the 4.0 and 5.0 industrial revolutions, particularly those based on artificial intelligence. With the rapid spread of these approaches, the evolution of the terms used in modern maintenance strategies is described, as well as their links with Condition-Based Maintenance (CBM), Prognostics and Health Management (PHM) and Remaining Useful Life (RUL) prediction. The § 3.3