NonHomogeneousPoissonAgeReplacementPolicy

class relife.policy.NonHomogeneousPoissonAgeReplacementPolicy(process, cr, cp, discounting_rate=0.0, ar=None)

Age replacement policy for non-Homogeneous Poisson process.

Parameters:

processnon-Homogeneous Poisson process

The underlying process. If the process expects covars, it must be frozen before.

crfloat or 1darray

The cost of repair.

cpfloat or 1darray

The cost of failure.

discounting_ratefloat, default is 0.

The discounting rate value used in the exponential discounting function

arfloat or 1darray, optional

Ages of preventive replacements, by default None. If not given, one must call optimize to set ar values and access to the rest of the object interface.

Attributes:

ar

Ages of the preventive replacements

cr

Cost of repair

cp

Cost of preventive replacements

discounting_rate

The discounting rate

Methods

asymptotic_expected_equivalent_annual_cost	The asymtotic expected equivalent annual cost
optimize	Computes the optimal age(s) of replacement and updates the internal ar value(s).

property ar

Ages of the preventive replacements

Returns:

ndarray

asymptotic_expected_equivalent_annual_cost()

The asymtotic expected equivalent annual cost

\[\lim_{t\to\infty} \text{EEAC}(t)\]

where \(\text{EEAC}(t)\) is the expected equivalent annual cost at \(t\).

Returns:

ndarray

The asymptotic expected equivalent annual cost

property cp

Cost of preventive replacements

Returns:

ndarray

property cr

Cost of repair

Returns:

ndarray

property discounting_rate

The discounting rate

Returns:

float

optimize()

Computes the optimal age(s) of replacement and updates the internal ar value(s).

Returns:

Self

Same instance with optimized ar.