fixes demo and add it to tests

docs/src/tutorials/custom_component.md

@@ -99,7 +99,7 @@ connections = [
     connect(Ro.n, Gnd.g)
 ]
 
-@named model = ODESystem(connections, t, systems=[L, Ro, G, C1, C2, Nr])
+@named model = ODESystem(connections, t, systems=[L, Ro, G, C1, C2, Nr, Gnd])
 nothing # hide
 ```
 

test/Mechanical/rotational.jl

@@ -60,7 +60,8 @@ end
                                  sine,
                              ])
     sys = structural_simplify(model)
-    prob = DAEProblem(sys, D.(states(sys)) .=> 0.0, [D(D(inertia2.phi)) => 1.0; D.(states(model)) .=> 0.0], (0, 10.0))
+    prob = DAEProblem(sys, D.(states(sys)) .=> 0.0,
+                      [D(D(inertia2.phi)) => 1.0; D.(states(model)) .=> 0.0], (0, 10.0))
     sol = solve(prob, DFBDF())
 
     # Plots.plot(sol; vars=[inertia1.w, -inertia2.w*2])

test/chua_circuit.jl

@@ -0,0 +1,50 @@
+using ModelingToolkit
+using ModelingToolkitStandardLibrary.Electrical
+using ModelingToolkitStandardLibrary.Electrical: OnePort
+using OrdinaryDiffEq
+using IfElse: ifelse
+
+@testset "Chua Circuit" begin
+    @parameters t
+
+    function NonlinearResistor(; name, Ga, Gb, Ve)
+        @named oneport = OnePort()
+        @unpack v, i = oneport
+        pars = @parameters Ga=Ga Gb=Gb Ve=Ve
+        eqs = [
+            i ~ ifelse(v < -Ve,
+                       Gb * (v + Ve) - Ga * Ve,
+                       ifelse(v > Ve,
+                              Gb * (v - Ve) + Ga * Ve,
+                              Ga * v)),
+        ]
+        extend(ODESystem(eqs, t, [], pars; name = name), oneport)
+    end
+
+    @named L = Inductor(L = 18)
+    @named Ro = Resistor(R = 12.5e-3)
+    @named G = Conductor(G = 0.565)
+    @named C1 = Capacitor(C = 10, v_start = 4)
+    @named C2 = Capacitor(C = 100)
+    @named Nr = NonlinearResistor(Ga = -0.757576,
+                                  Gb = -0.409091,
+                                  Ve = 1)
+    @named Gnd = Ground()
+
+    connections = [connect(L.p, G.p)
+                   connect(G.n, Nr.p)
+                   connect(Nr.n, Gnd.g)
+                   connect(C1.p, G.n)
+                   connect(L.n, Ro.p)
+                   connect(G.p, C2.p)
+                   connect(C1.n, Gnd.g)
+                   connect(C2.n, Gnd.g)
+                   connect(Ro.n, Gnd.g)]
+
+    @named model = ODESystem(connections, t, systems = [L, Ro, G, C1, C2, Nr, Gnd])
+    sys = structural_simplify(model)
+    prob = ODEProblem(sys, Pair[], (0, 5e4), saveat = 0.01)
+    sol = solve(prob, Rodas4())
+
+    @test sol.retcode == :Success
+end

test/runtests.jl

@@ -10,6 +10,7 @@ using SafeTestsets
 @safetestset "Analog Circuits" begin include("Electrical/analog.jl") end
 #@safetestset "Digital Circuits" begin include("Electrical/digital.jl") end
 @safetestset "RC Circuit Demo" begin include("demo.jl") end
+@safetestset "Chua Circuit Demo" begin include("chua_circuit.jl") end
 
 # Thermal
 @safetestset "Thermal Circuits" begin include("Thermal/thermal.jl") end