modelBrokenTransitionPull

The outflow from A is proportional to the inflow to B
Diagram of BrokenTransitionPullOpen the diagram
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Extends from Interfaces.Basics.GenericFlow (Flow Template with two FlowPorts), Interfaces.Basics.Interaction4SO (Output connectors for interaction elements reporting rates), Icons.Interaction (Icon for interactional flow classes).

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
Diagram.png

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.

See also

BrokenTransition, Transition

Parameters

TypeNameDefaultDescription
OutputType_BrateunspecifiedConstant rate of inflow to the stock B
Realfactor1Constant factor of proportionality to be multiplied with the inflow to B [base units A/base units B]
OutputType_AinputA1Constant input of A to specify the conversion factor as the ratio inputA : outputB
OutputType_BoutputB1Constant output of B to specify the conversion factor as the ratio inputA : outputB
Structural Parameters
BooleanhasConstantFactorfalse= true, if the factor is to be given by the constant parameter
BooleanhasConstantRatefalse= true, if the outflow rate for A is to be given by the constant parameter
BooleanuseExplicitRatiofalse= true, if instead of a constant factor a constant ratio of output per input is to be entered

Connectors

TypeNameDefaultDescription
Connectors.FlowPortportA (from GenericFlow)Flow from/to Stock A
Connectors.FlowPortportB (from GenericFlow)Flow to/from Stock B
RealOutput_By_B (from Interaction4SO)Rate for flow to and from B (positive value indicates inflow)
RealOutput_By1_B (from Interaction4SO)Rate for flow to and from B (positive value indicates inflow)
RealOutput_Ay1_A (from Interaction4SO)Rate for flow to and from A (positive value indicates inflow)
RealOutput_Ay_A (from Interaction4SO)Rate for flow to and from A (positive value indicates inflow)
Interfaces.Connectors.RealInputu_rateRate of inflow to B
Interfaces.Connectors.RealInputu_factorFactor of proportionality (amount of A per amount of B)

Revisions

  • Value for the optional parameter rate changed to unspecified in v2.1.0.

  • Component type for parInflowRate_B changed to ConstantConverter in v2.2.

  • Type for factor changed to Real in v2.2.

  • Added useExplicitRatio option for more convenience in unit conversions in v2.2.