Monitoring of production cell, based on noise and vibration signals [Elektronski vir] : a case study
Berlec, Tomaž ...
Monitoring of automated production line is usually based on sensors within the production cells, containing a multitude of assembly processes. Sensors for tracking the production process typically ...provide only digital output, thus they are not able to detect and evaluate environmental conditions during the assembly. In some cases a control of machined parts is included in such cell to provide high reliability of parts geometrical accuracy, before being built into the assembly. This is especially important for high end optical products and electronics with moving parts. A system for monitoring of noise and vibration was installed into the production cell containing 7 operations, including an optical measurement of the radar deflector roundness to check its quality before being installed. Production was often interrupted by larger than expected number of unacceptable radar deflectors. Sound and vibration signals were analyzed in order to find the cause for unexpected behavior of measurement procedure. It was found out that noise and vibration signals contain sufficient information for monitoring the measurement process. Signal features were extracted to clearly identify the time lag to be the cause of the false-fault identification. Additionally, noise and vibration conditions during the assembly process of the product can be integrated into its serial number in order to track its performance during its life time. Such information can lead to optimization of assembly conditions.
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