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The concept of dormant phases is supported in the Mission Profile file. For more information, see Dormant Conversion Table. When the phase is dormant, the duty cycle is set to 0 because no partially dormant phase can exist.
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Scenario
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Operating Environment
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Dormant Environment
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Duty Cycle
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Mission Profile File for Project
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Failure Rate Equation
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Mission Failure Rate Equation
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---|---|---|---|---|---|---|
1
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Specified
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None
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Specified
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No Data
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Active FR * Duty Cycle
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None
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2
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Specified
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Specified
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Specified
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No Data
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(Active FR * Duty Cycle) + (Dormant FR * (100 − Duty Cycle))
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None
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3
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Specified
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None
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Specified
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Contains Data
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Active FR * Duty Cycle
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For active phases in the Mission Profile file:
1. Calculate Active FR of Phase(n) using operating environment and temperature from Mission Profile file.
2. Calculate Phase FR = Active FR * Duty Cycle.
3. Calculate Total FR = SUM(Phase FR(i) * Percentage in Phase (i)).
For dormant phases in the Mission Profile file:
1. Calculate Dormant FR of Phase(n) using operating environment, dormant environment, and temperature from Mission Profile file.
2. Calculate Phase FR = Dormant * 100.
3. Calculate Total FR = SUM(Phase FR(i) * Percentage in Phase (i)).
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4
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Specified
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Specified
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Specified
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Contains Data
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(Active FR * Duty Cycle) + (Dormant FR * (100 − Duty Cycle))
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For active phases in the Mission Profile file:
1. Calculate Active FR of Phase(n) using operating environment and temperature from Mission Profile file.
2. Calculate Dormant FR of Phase(n) using operating environment and temperature from Mission Profile file and dormant environment from Calculation Data pane.
3. Calculate Phase FR(n) = (Active FR * Duty Cycle from Assembly) + (Dormant FR * (100 − Duty Cycle from Assembly))
4. Calculate Total FR = SUM(Phase FR(i) * Percentage in Phase (i)).
For dormant phases in the Mission Profile file:
1. Calculate Dormant FR of Phase(n) using operating environment, dormant environment, and temperature from Mission Profile file.
2. Calculate Phase FR = Dormant FR * 100.
3. Calculate Total FR = SUM(Phase FR(i) * Percentage in Phase (i))
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