BrokenTransitionPull

The outflow from A is proportional to the inflow to B

Diagram

Information

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This is a variant of the classical broken flow (→BrokenTransition) structure that allows for a different parameterization: In this component the given value for the rate (rate or u_rate) relates to the inflow to stock B, while the factor of proportionality (factor or u_factor) determines the outflow from stock A that is necessary for this process.

A typical application would be to have a given rate of production (here the stock B would be the stock of finished goods) which needs an outflow from the stock of materials that is proprotional to the rate of production according to a factor determined by the bill of materials.

Hence:

rate of outflow from A = rate of inflow to B × factor of proportionality

The factor of proportionality will be given in base units of A per base units of B, so that the resulting outflow from A will have proper units [base units for a flow of A].

Implementation

Diagram for BrokenTransitionPull

Notes

Unlike the classical broken flow structure, setting the rate for the stock B might not take into account the availability of material in the stock A; so this has to be taken care of by the modeler explicitly.

Great care has to be taken entering the factor as it needs to be given in base units of stock A per base units of stock B. If the unit attribute is left an empty string (default), then fitting units will automatically be deduced effectively short-circuiting unit checks.

To more robustly specify conversion factors, upon useExplicitRatio = true a constant ratio inputA per outputB can alternatively be given, where inputA and outputB will have units according to OutputType_A and OutputType_B, respectively.

Parameters (7)

rate	Value: unspecified Type: OutputType_B Description: Constant rate of inflow to the stock B
factor	Value: 1 Type: Real Description: Constant factor of proportionality to be multiplied with the inflow to B [base units A/base units B]
inputA	Value: 1 Type: OutputType_A Description: Constant input of A to specify the conversion factor as the ratio inputA : outputB
outputB	Value: 1 Type: OutputType_B Description: Constant output of B to specify the conversion factor as the ratio inputA : outputB
hasConstantFactor	Value: false Type: Boolean Description: = true, if the factor is to be given by the constant parameter
hasConstantRate	Value: false Type: Boolean Description: = true, if the outflow rate for A is to be given by the constant parameter
useExplicitRatio	Value: false Type: Boolean Description: = true, if instead of a constant factor a constant ratio of output per input is to be entered

Connectors (8)

	portA	Type: FlowPort Description: Flow from/to Stock A
	portB	Type: FlowPort Description: Flow to/from Stock B
	y_B	Type: RealOutput_B Description: Rate for flow to and from B (positive value indicates inflow)
	y1_B	Type: RealOutput_B Description: Rate for flow to and from B (positive value indicates inflow)
	y1_A	Type: RealOutput_A Description: Rate for flow to and from A (positive value indicates inflow)
	y_A	Type: RealOutput_A Description: Rate for flow to and from A (positive value indicates inflow)
	u_rate	Type: RealInput Description: Rate of inflow to B
	u_factor	Type: RealInput Description: Factor of proportionality (amount of A per amount of B)

Components (8)

	conversionFactor	Type: Gain Description: Input is multiplied by constant parameter
	flowingOut	Type: Decline Description: Outflow for stock A
	u_InflowRate_B	Type: PassThrough Description: Input of inflow rate for B
	parInflowRate_B	Type: ConstantConverter Description: Constant rate of inflow to B
	outflowRate_A	Type: Product_2 Description: Rate of outflow from stock A
	flowingIn	Type: Growth Description: Inflow to stock B
	u_Factor	Type: PassThrough Description: Input for factor of proportionality
	parFactor	Type: ConstantConverter Description: Constant factor of proportionality