cModel Class

The model class allows you to represent probabilities, durations or costs, either fixed or time-dependent. It also contains methods for accessing the calculations performed with the Quick Calculation Pad (QCP).

Constructors

• New cModel Creates a new model.

Properties

• Name Sets or returns the name of the model (the one used in the repository)
• ID Returns the ID of the model (the one used in the repository).
• ProjectID Returns the ID of the project the resource belongs to.
• Type Returns the type of the model.
• Category Returns the category of the model.
• Designation Returns the designation of the model (for example Weibull-2).
• ErrorHappened Whether or not the last calculation produced an error.
• ConfLevel Returns the confidence level that is currently used for calculations.
• NumStresses Returns the number of stresses in the model.

Methods

• SetModel Sets a new model.
• SetUseStress Sets use stress value for a particular stress. This value is used in subsequent calculations.
• Reliability Calculates the Reliability for a given time.
• Unreliability Calculates the Unreliability for a given time.
• Time Calculates the time value for a given Reliability.
• MeanTime Calculates the mean time value for a given Reliability.
• Pdf Calculates the PDF.

• FailureRate Returns failure rate given time.

• FailureRate ( Time As Double , Optional CurrentAge As Double ) 0, Optional DutyCycle As Double 1) As Double

Returns failure rate given time.

• Parameters Returns an array containing model parameters and their values.
• ScaleParameter_A Returns the scale parameter for ALTA models. Returns 0 if the model is not an ALTA model.
• Bounds_Reliability Returns the bounds on the reliability given time.
• Bounds_Unreliability Returns the bounds on the unreliability given time
• Bounds_Time Returns the bounds on time given reliability
• Bounds_MeanTime Returns the bounds on mean time
• Bounds_FailureRate Returns bounds on failure rate given time.
• Bounds_Parameters Returns an array containing bounds on all model parameters.
• SetConfindenceLevel Sets the confidence level for all subsequent confidence bounds calculations.

Formatted Usage Example

Declare the WeibullDataSet. See New WeibullDataSet for additional details.

       Dim WDS as New WeibullDataSet

Add values to the raw data. See WeibullDataSet.AddFailure for additional details.

       WDS.AddFailure(1, 1)
       WDS.AddFailure(2, 1)
       WDS.AddFailure(3, 1)

Calculate the Fitted Model using the raw data.See WeibullDataSet.CalculateBestFit for additional details.

       WDS.CalculateBestFit

Use the Fitted Model using the raw data. See WeibullDataSet.FittedModel for additional details.

       Dim WDSFittedModel as cModel
       WDSFittedModel = WDS.FittedModel