User-Defined Control Variables: Mileage

This is a very simple model of a car (one reliability element), that contains a number of failure modes that use mileage as a control variable.

To set up a user-defined failure mode, a monotonically increasing variable, such as mileage for a car, or the number of takeoffs and landings for an aircraft, must be modeled in GoldSim. Typically this is done with an Integrator element, using the Rate of Change input. In this case, we have an integrator representing mileage, and a stochastic element, resampled once per year, which is used as the Mileage Integrator's rate of change input.

Important Note: User-defined failure mode control variables are only updated when the model is updated, unlike the time variables, which can interrupt the simulation at the appropriate time. Therefore, models using user-defined timesteps require a higher number of timesteps.

To Open the Model File:

1. Start GoldSim
2. Click on the File and select Open Example...
3. Browse to Reliability Examples
4. Select the file called Mileage.gsm