Chapter 5.4: System Structure Function; Minimal Cuts and Minimal Paths

Chapter 5.4: System Structure Function; Minimal Cuts and Minimal Paths

1. Coherent Systems:

   • Doesn´t degrade the system reliability.
   • Its structure function is monotonically increasing.

2. Minimal PATHS and CUT sets

   • PATHS is a set of components whose functioning ensures that the system function.
     • Minimal PATHS: All the components within the set must function for the system to function.
   • CUT is a set of components whose failure will result in a system failure.
     • Minimal CUT: All the components must fail in order for the system to fail

3. Common modes Failures

   • Several components may share the same power source or external enviromental conditions such as excessive heat or vibration may several components in the same manner.

4. Three States Devices

   • Open and Short failure mode.
     • Redundancy mat either increase or dicrease system reliability

5. Parallel Structure

6. Low Level Redundancy