Package org.jreliability.importancemeasures

Class RRW<T>

java.lang.Object
org.jreliability.importancemeasures.RRW<T>
Type Parameters:
T - The type of the variables of the BDD of the system
All Implemented Interfaces:
ImportanceMeasure, TimeDependentImportanceMeasure<T>
public class RRW<T> extends Object implements TimeDependentImportanceMeasure<T>
The RRW class calculates the RRW values for coherent and non-coherent systems. Uses [Ali17] to calculate them. [Ali17] ( https://nbn-resolving.org/urn:nbn:de:bvb:29-opus4-87185 )

  • Field Details

    • bdd

      protected final BDD<T> bdd

    • transformer

      protected final org.apache.commons.collections15.Transformer<T,ReliabilityFunction> transformer

    • provider

      protected final BDDProvider<T> provider

    • bddTTRF

      protected final BDDTTRF<T> bddTTRF

  • Constructor Details

    • RRW

      public RRW(BDD<T> bdd, org.apache.commons.collections15.Transformer<T,ReliabilityFunction> transformer)
      Returns a RRW calculator for a specific system with its BDD and ReliabilityFunction Transformer.
      Parameters:
      bdd - The BDD representing the system structure function
      transformer - The Transformer used to get the ReliabilityFunction of variables present in the BDD

  • Method Details

    • calculate

      public Map<T,Double> calculate(double time)
      Calculates the RRW values for all components at the specified time. Uses equation 4.7 of [Ali17] to calculate the RRW values from the conditional unreliability of the system if a component works correctly and the nominal system unreliability. Note: [BAGT16] (https://doi.org/10.1016/j.ejor.2016.03.054) use a slightly different notation. They use U_i^- instead of U_i^+ because they use failure probabilities, while this framework generally uses success probabilities for the components, as does [Ali17]. In [BAGT16] U_i^- corresponds to no failure in a component. In [Ali17] U_i^+ corresponds to a correctly working component. They are equivalent.
      Specified by:
      calculate in interface TimeDependentImportanceMeasure<T>
      Parameters:
      time - Time t at which the RRW values of all components is calculated. Must be greater than 0, otherwise an IllegalArgumentException is thrown.
      Returns:
      results Map of components and their respective RRW values at time t.