Time to Failure and Time to Repair Profiles Identification

This paper covers with the identification of real statistical distribution of time to failure (TTF) and time to repair (TTR) of a manufacturing production line. A formal procedure to obtain TTF and TTR profile distributions (location, scale and shape parameters) has been defined. The procedure processes redundant and corrupted signals logged from control systems of the manufacturing machines during operative phases (i.e. alarms and process data). We define a formal algorithm to filter the data and establish the qualitative and quantitative characteristics for reliability applications. This procedure has been applied to data acquired from a Tetra Pak packaging line. The resulting TTF and TTR profiles have been used to define statistical failure and restoration input in simulation campaigns of a packaging line.