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WOLFRAM SYSTEM MODELER

Level

General System Dynamics level

Diagram

Wolfram Language

In[1]:=

SystemModel["SystemDynamics.Levels.Level"]

Out[1]:=

Information

This is the general continuous Level model of the System Dynamics methodology with a single inflow and a single outflow. It computes the level by integrating over the difference between inflow and outflow rates.

Parameters (1)

x0	Value: 0 Type: Real Description: Initial condition

Outputs (1)

level	Type: Real Description: Continuous state variable

level

Type: Real

Description: Continuous state variable

Connectors (7)

	u1	Type: MassInPort Description: Inflow variable
	u2	Type: MassInPort Description: Outflow variable
	y	Type: MassOutPort Description: State variable
	y1	Type: MassOutPort Description: State variable
	y2	Type: MassOutPort Description: State variable
	y3	Type: MassOutPort Description: State variable
	y4	Type: MassOutPort Description: State variable

Components (2)

	Add1	Type: Add Description: Output the sum of the two inputs
	Integrator1	Type: Integrator Description: Output the integral of the input signal with optional reset

Add1

Type: Add

Description: Output the sum of the two inputs

Integrator1

Type: Integrator

Description: Output the integral of the input signal with optional reset

Used in Examples (9)

	Scenario_1 SystemDynamics.WorldDynamics.World2 1st Scenario
	Scenario_2 SystemDynamics.WorldDynamics.World2 2nd Scenario
	Scenario_3 SystemDynamics.WorldDynamics.World2 3rd Scenario
	Scenario_4 SystemDynamics.WorldDynamics.World2 4th Scenario
	Scenario_6 SystemDynamics.WorldDynamics.World2 6th Scenario
	Gilpin SystemDynamics.IntroductoryExamples Gilpin population dynamics model
	Hair_Lynx_Interaction SystemDynamics.IntroductoryExamples Predator/prey model
	Flu SystemDynamics.IntroductoryExamples.Influenza Model of an influenza epidemic
	Sugar_Cane SystemDynamics.IntroductoryExamples Model of osmosis process in sugar cane

Used in Components (10)

	DELAY1 SystemDynamics.Functions First-order exponential delaying
	DELAY3 SystemDynamics.Functions Third-order exponential delaying
	Factory SystemDynamics.IndustrialDynamics.Inventory Factory model
	Distribution SystemDynamics.IndustrialDynamics.Inventory Distribution model
	Retail SystemDynamics.IndustrialDynamics.Inventory Retail model
	Industrial_Investment SystemDynamics.WorldDynamics.World3 Investments in the military/industrial sector
	Land_Fertility SystemDynamics.WorldDynamics.World3 Land fertility
	Pollution_Dynamics SystemDynamics.WorldDynamics.World3 Pollution dynamics
	Population_Dynamics SystemDynamics.WorldDynamics.World3 Population dynamics
	Service_Sector_Investment SystemDynamics.WorldDynamics.World3 Investments in the service sector