ExponentialChange

Exponential growth or decline process

Diagram

Information

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Using the →ExponentialChange component from the SourcesOrSinks package, this component allows to model exponential change at either a constant fractional rate or at an exogneous rate given by the input u_rate.

The process by default is active over the whole simulation run, but can be restricted to an on-off period using tc = TimingChoices.period and the parameters startTime and stopTime. Any given rate—rate or u_rate—can be modified by multiplication with an optionally given input u.

Implementation

DiagramView

Parameters (8)

hasRateOutput	Value: false Type: Boolean Description: = true, if the rate is reported via real output connectors
tc	Value: TimingChoices.permanent Type: TimingChoices Description: Select whether contoll is permanent or timed
onTime	Value: modelSettings.modelStartTime Type: Time (s) Description: Time for component to become effective
offTime	Value: modelSettings.modelTimeHorizon Type: Time (s) Description: Time for component to become ineffective
rate	Value: unspecified Type: OutputType Description: Constant rate (optional)
hasConstantRate	Value: true Type: Boolean Description: = true, if rate is a constant parameter
hasFactor	Value: false Type: Boolean Description: = true, if rate is to be multiplied with input u
isCCR	Value: true Type: Boolean Description: = true, if the factional rate given is assumed to be a continuously compounding rate else the rate will be converted

Connectors (5)

	flowPort	Type: FlowPort Description: Used to represent stock and flow connections
	y	Type: RealOutput Description: Output of current rate of flow
	y1	Type: RealOutput Description: Output of current rate of flow
	u	Type: RealInput Description: Factor input
	u_rate	Type: RealInput Description: Rate input

Components (7)

	modelSettings	Type: ModelSettings Description: Setting important global variables within a model
	onOff	Type: PulseInput Description: Generate pulse or pulse-train signal of real input
	permanent	Type: ConstantConverter Description: A constant value is turned into a constant signal
	parFactor	Type: ConstantConverter Description: A constant value is turned into a constant signal
	actualRate	Type: Product_3 Description: Inputs are multiplied
	parRate	Type: ConstantConverter Description: A constant value is turned into a constant signal
	exponentiallyChanging	Type: ExponentialChange Description: Exponential growth or decline of connected stock