The model demonstrates the "PM:Preventive Maintenance" failure mode.
In the model, there are two child elements.
- Both children have two failure modes. The first is a failure that occurs after 3 years of operating time. The second is a failure mode that occurs after 3.5 years of total time.
- Child_1 repairs the second failure mode during a PM, while Child_2 does not. (The first failure mode, which is based on "Operating time" is always repaired by a PM for both children).
- Each child also has a PM: Preventive Maintenance mode that lasts for 1 year and is triggered each time the parent undergoes a PM:Preventive Maintenance mode.
- The parent has no failure modes but does have a PM:Preventive Maintenance mode that lasts for exactly 1 year. This mode is triggered at 4 and 7 years.
When the simulation is run, both Child_1 and Child_2 fail due to the first failure mode (based on Operating time) at 3 years. The second failure mode (based on Total time) fails at 3.5 years. The PM:Preventive Maintenance mode of the parent is triggered at 4 years, and this immediately triggers the preventive maintenance of the two children. Because both failure modes for Child_1 are repaired by a PM , Child_1 starts operating at 5 years (at the completion of the PM). However, Child_2 remains failed and continues to show a status of 2, since the second failure mode is not repaired by the PM. A second PM is performed at 7 years. For Child_1, this resets the control variable value for the first failure mode (occurring after 3 years of operating time since a PM event). Child_2 remains failed due to failure mode 2. Child_1 begins operating again at 8 years, with the 2nd failure mode causing failing at 8.5 years.
To Open the Model File:
- Start GoldSim
- Click on the File and select Open Example...
- Browse to Reliability Examples
- Select the file called PreventiveMaintenance.gsm