Package org.jreliability.importancemeasures

Class BarlowProschan<T>

java.lang.Object

org.jreliability.importancemeasures.BarlowProschan<T>

Type Parameters:

T - The type of the variables of the BDD of the system

All Implemented Interfaces:

ImportanceMeasure

public class BarlowProschan<T>
extends Object
implements ImportanceMeasure

The BarlowProschan class calculates the time-independent importance for coherent systems proposed by Barlow and Proschan in [BP75]. Uses the implementation of the BP importance in [Nat09]. [BP75] ( https://doi.org/10.1016/0304-4149(75)90013-7 ) [Nat09] ( https://doi.org/10.1007/s11009-008-9079-1 )

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	BarlowProschan.BarlowProschanFunction

Field Summary

Fields

Modifier and Type	Field	Description
protected final BDD<T>	bdd
protected final BDDTTRF<T>	bddTTRF
protected final MomentEvaluator	moment
protected final BDDProvider<T>	provider
protected final org.apache.commons.collections15.Transformer<T,ReliabilityFunction>	transformer

Constructor Summary

Constructors

Constructor	Description
BarlowProschan(BDD<T> bdd, org.apache.commons.collections15.Transformer<T,ReliabilityFunction> transformer)	Returns a BarlowProschan calculator for a specific system with its BDD and ReliabilityFunction Transformer.

Method Summary

Modifier and Type	Method	Description
Map<T,Double>	calculate()	Calculates the Barlow Proschan importances for all components.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

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

moment

protected final MomentEvaluator moment

Constructor Details

BarlowProschan

public BarlowProschan(BDD<T> bdd,
 org.apache.commons.collections15.Transformer<T,ReliabilityFunction> transformer)

Returns a BarlowProschan 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()
                        throws ArithmeticException

Calculates the Barlow Proschan importances for all components. It is only defined for coherent systems, ie. for systems where its reliability is with component x working is always higher, than when it is not working. As it integrates over the difference in the reliability, the difference must not be negative ie. the system must be coherent. Uses equation 2 of [Nat09] to create the BP function, to be integrated.

Returns:

results Map of components and their respective Barlow Proschan importance

Throws:

ArithmeticException - In case a non-coherent system is tried to be evaluated.