blockPerformanceIndicator
Extends from Interfaces.PartialConverters.SISO_Conversion (Partial SISO converter class with input and output conversions for lookup functions).
Information
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The output y is the dimensionless degree of membership to the set of "good performances" or "good outcomes" according to a chosen type of membership function. Using the PerformanceIndicator allows to quickly grasp how a system is currently performing with regard to some criteria: a value of 1 indicates best possible performance, while a value of 0 indicates unsustainable performance.
The following grid displays all available membership function types without inversion (invertResults = false):
 |
| Membership Function Type | a | b | c | d |
|---|---|---|---|---|
| ramp | foot | shoulder | ||
| triangular | left foot | center | right foot | |
| trapezoidal | left foot | left shoulder | right shoulder | right foot |
| sshaped | foot | shoulder | ||
| sigmoidal | steepness of transition area | center of transition area | ||
| pishaped | left foot | left shoulder | right shoulder | right foot |
| psigmoidal | steepness of left transition | center of left transition area | steepness of right transition | center of right transition area |
| gaussian | half width at half maximum | center of curve (maximum) | ||
| bell | width of core | steepness | center of core |
When inversion is turned on (invertResult = true) the result obtained from the membership function as specified will be subtracted from 1. Thus the ramp shown above can be made to ramp down from left to right with a being the shoulder and b the foot by inverting the results.
See also
rampmf, trapmf, trimf, smf, sigmf, pimf, psigmf, gaussmf, gbellmf
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| InputType | a | Parameter to control shape of membership function | |
| InputType | b | Parameter to control shape of membership function | |
| InputType | c | Parameter to control shape of membership function | |
| InputType | d | Parameter to control shape of membership function | |
| Time Conversion | |||
| Boolean | convertInput (from SISO_Conversion) | false | = true, if the input value is a rate or time variable that needs to be converted |
| Boolean | inputIsRate (from SISO_Conversion) | false | = true, if the input is given in units of time, otherwise it is assumed to be a rate |
| Boolean | convertOutput (from SISO_Conversion) | false | = true, if the output value is a rate or time variable that needs to be converted |
| Boolean | outputIsRate (from SISO_Conversion) | false | = true, if the output is given in units of time, otherwise it is assumed to be a rate |
| TimeBases | timeBaseInput (from SISO_Conversion) | TimeBases.seconds | TimeBase to convert from (default = seconds) |
| TimeBases | timeBaseTableIn (from SISO_Conversion) | modelSettings.modelDisplayTimeBase | TimeBase used for the lookup function input (default = modelDisplayTimeBase) |
| TimeBases | timeBaseTableOut (from SISO_Conversion) | modelSettings.modelDisplayTimeBase | TimeBase assumed for the lookup function output (default = modelSettings.modelDisplayTimeBase) |
| TimeBases | timeBaseOutput (from SISO_Conversion) | TimeBases.seconds | TimeBase used for the output (default = seconds) |
| Structural Parameters | |||
| MembershipFunctionTypes | mft | MembershipFunctionTypes.ramp | Membership function type to use |
| Boolean | invertResult | false | = true, if the degree of membership is to be inverted (i.e., y = 1 - mf(u)) |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Connectors.RealInput | u (from SISO) | Input |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| RealOutput | y (from SO) | ||
| ModelSettings | modelSettings (from SISO_Conversion) |
Revisions
- Modified in v2.0.0.
- Changed type for parameters
a,b,c,dtoInputTypein v2.2.