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Preventive Maintenance
Optimization Inspection Schedules
Predictive Maintenance Schedules
Engineered Software
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Three techniques for optimizing maintenance schedules are presented in
this module:
- Preventive Maintenance schedules - there is a fixed cost for the
performance of a PM. If a PM is not conducted eventually there
will be a failure with a fixed cost. An example is scheduling a
belt to be changed. There is a cost for changing the belt, but
an even higher cost for allowing the belt to fail.
- Inspection schedules - in some cases it is impossible to determine
if a defect exists without inspection. This may be a defect causing
scrap production or a defect causing machinery damage. The problem is
to determine how often inspections should take place. There is an
inspection cost, but the cost of an undetected defect in the process
increases with time.
- Predictive Maintenance Schedules - predictive maintenance tools
(vibration analysis, oil analysis, thermography, etc.) are
increasingly being used to prevent machinery failures and thus reduce
operating expenses. This techniques assumes there is a time
period in which an impending catastrophic failure can be
detected.
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