Generic Structures First-Order Negative Feedback

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26D-4475-2Section 2.3: Company Downsizing Model Documentationnumber of employees(t) = number of employees(t – dt) + (– firing rate) * dtINIT number of employees = a constantDOCUMENT: This is the number of employee who work for the company.UNIT: employeeOUTFLOWS:firing rate = distance to goal/adjustment timeDOCUMENT: This is the number of employees who are fired per week.UNIT: employee/weekadjustment time = a constantDOCUMENT: This is the time constant of the system.UNIT: weekdesired number of employees = a constantDOCUMENT: This is the goal for the negative feedback system.UNIT: employeedistance to goal = number of employees – desired number of employeesDOCUMENT: This is the adjustment gap for the negative feedback system.UNIT: employee
D-4475-2 27Vensim Examples:Generic Structures: First-Order NegativeFeedbackBy Aaron DiamondOctober 20012.1 Example 1: Radioactive DecayRadioactiveCompoundrate of decayDECAY FRACTIONINITIAL RADIOACTIVE COMPOUNDFigure 13: Vensim Equivalent of Figure 2: Radioactive DecayDocumentation for Radioactive Decay model(1) DECAY FRACTION=a constantUnits: 1/yearThis is the draining fraction of the negative feedback system.(2) FINAL TIME = 100Units: YearThe final time for the simulation.(3) INITIAL RADIOACTIVE COMPOUND=a constantUnits: atoms(4) INITIAL TIME = 0Units: YearThe initial time for the simulation.(5) Radioactive Compound= INTEG (-rate of decay, INITIAL RADIOACTIVECOMPOUND)Units: atomsThis is the amount of radioactive compound present.
Page 1 and 2: D-4475-2 1Generic Structures:First-
Page 3 and 4: D-4475-2 3Table of Contents1. INTRO
Page 5 and 6: D-4475-2 5
Page 7 and 8: D-4475-2 71. IntroductionGeneric st
Page 9 and 10: D-4475-2 9A simple negative feedbac
Page 11 and 12: D-4475-2 11number of employeesfirin
Page 13 and 14: D-4475-2 13flow = adjustment gap *
Page 15 and 16: D-4475-2 153.3 Model BehaviorThe ch
Page 17 and 18: D-4475-2 171: STOCK 2: STOCK 3: STO
Page 19 and 20: D-4475-2 195. Summary of important
Page 21 and 22: D-4475-2 21To sum up, asymptotic gr
Page 23 and 24: D-4475-2 23Figure 12. Company Downs
Page 25: D-4475-2 25UNIT: atomsOUTFLOWS:rate
Page 29 and 30: D-4475-2 292.2 Example 2: Populatio
Page 31 and 32: D-4475-2 31The initial time for the
Page 33 and 34: D-4475-2 33(05) GOAL FOR STOCK=a co
Page 35 and 36: D-4475-2 35Graph of Stock with diff

Generic Structures First-Order Negative Feedback

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