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diff --git a/lang/dynamo/1.8.7/src/dyn.wohnen b/lang/dynamo/1.8.7/src/dyn.wohnen new file mode 100644 index 0000000..4e9b8b4 --- /dev/null +++ b/lang/dynamo/1.8.7/src/dyn.wohnen @@ -0,0 +1,105 @@ +note modell des wohnbaus in einer stadt +note +note siehe Goodman: Study Notes in System Dynamics, Seite 332 ff +note +note Bevölkerungs-Sektor +note +L pop.k=pop.j+dt*(imr.jk-omr.jk-ndr.jk) +N pop=popi +C popi=30.3 +note +note pop population (people) +note popi population initial value +note imr immigration rate (people/year) +note omr out-migration rate(people/year) +note +R imr.kl=nim*ammp.k*pop.k +C nim=.145 +note +note nim normal immigration (fraction/year) +note ammp attractiveness for migration multiplier perceived (dimensionless) +note +A ammp.k=smooth(amm.k,mpt) +C mpt=5 +note +note amm attractiveness for migration multiplier (dimensionless) +note mpt migrant perception time (years) +note +A amm.k=table(ammt,hr.k,0,2,.25) +T ammt=.05/.1/.2/.4/1/1.6/1.8/1.9/2 +note +note ammt attractiveness for migration multiplier table +note hr housing ratio (dimensionless) +note +A dmm.k=1/amm.k +note +note dmm departure migration multiplier (dimensionless) +note +R omr.kl=nom*dmm.k*pop.k +C nom=.02 +note +note nom normal out migration (fraction/year) +note +R ndr.kl=pop.k*drf +C drf=.025 +note +note ndr net death rate (people/year) +note drf death rate factor (fraction/year) +note************************************************************************* +note housing sector +note************************************************************************* +note +L h.k=h.j+dt*(hcr.jk-hdr.jk) +N h=hi +c hi=10 +note +note h housing (units) +note hcr housing construction rate (units/year) +note hdr housing demolition rate (units/year) +note hi initial value of houses (units) +note +R hcr.kl=nhc*hcm.k*lam.k*h.k +C nhc=.12 +note +note nhc normal housing construction (fraction/year) +note hcm housing construction multiplier (dimensionless) +note lam land availability multiplier (dimensionless) +note +A hcm.k=table(hcmt,hr.k,0,2,.25) +T hcmt=2.5/2.4/2.3/2/1/.37/.2/.1/.05 +note +A hr.k=h.k/hd.k +note +note hr housing ratio(dimensionless) +note hd housing desired (units) +note +A hd.k=pop.k*upp +C upp=.33 +note +note upp units per person (unit/person) +note +A lam.k=table(lamt,lfo.k,0,1,.25) +T lamt=1/.8/.5/.2/0 +note +note lfo land fraction occupied (dimensionless) +note +A lfo.k=H.k*lpu/land +C lpu=1 +C land=1500 +note +note lpu land per unit(acres/unit) +note land (acres) +note +R hdr.kl=h.k/alth +C alth=50 +note +note alth average lifetime of housing (years) +note*********************************************************************** +note control statements +note*********************************************************************** +note +plot h=h(0,2000)/pop=p(0,8000)/hcr=c,hdr=d(0,100) +C dt=1 +C length=200 +C pltper=2 + |