removed ConstantX components

Author: Brad Carman

docs/src/connectors/sign_convention.md

@@ -57,10 +57,13 @@ This is demonstrated in the following domains of `Mechanical`, `Electrical`, and
 
 The flow variable (i.e. force) input component for the `Mechanical` domain is
 
-```julia
+```@example sign_convention
+using ModelingToolkit
+using ModelingToolkitStandardLibrary.Mechanical.Translational
+
 @mtkmodel ConstantForce begin
     @parameters begin
-        f = 0
+        f
     end
     @components begin
         flange = MechanicalPort()
@@ -75,12 +78,6 @@ end
 Here we can see that a positive input force results in an increasing velocity.
 
 ```@example sign_convention
-using ModelingToolkit
-using ModelingToolkitStandardLibrary.Mechanical.Translational
-
-@parameters t
-D = Differential(t)
-
 @mtkmodel System begin
     @components begin
         mass = Mass(; m = 10)
@@ -98,10 +95,12 @@ full_equations(sys)
 
 The flow variable (i.e. current) input component for the `Electrical` domain is
 
-```julia
+```@example sign_convention
+using ModelingToolkitStandardLibrary.Electrical
+
 @mtkmodel ConstantCurrent begin
     @parameters begin
-        i = 0
+        i
     end
     @components begin
         p = Pin()
@@ -117,8 +116,6 @@ end
 Here we can see that a positive input current results in an increasing voltage. Note that the electrical domain uses pins `p` and `n` at each side of the source and energy storage components.  The direction of connection is not important here, only that a positive connector `p` connects with a negative connector `n`.
 
 ```@example sign_convention
-using ModelingToolkitStandardLibrary.Electrical
-
 @mtkmodel System begin
     @components begin
         capacitor = Capacitor(; C = 10)
@@ -156,11 +153,13 @@ full_equations(sys)
 
 The flow variable (i.e. mass flow) input component for the `Hydraulic` domain is
 
-```julia
+```@example sign_convention
+using ModelingToolkitStandardLibrary.Hydraulic.IsothermalCompressible
+
 @mtkmodel ConstantMassFlow begin
     @parameters begin
         p_int
-        dm = 0
+        dm
     end
     @components begin
         port = HydraulicPort(; p_int)
@@ -174,8 +173,6 @@ end
 A positive input mass flow leads to an increasing pressure (in this case we get increasing density (`rho`), which is directly related to an increasing pressure).
 
 ```@example sign_convention
-using ModelingToolkitStandardLibrary.Hydraulic.IsothermalCompressible
-
 @mtkmodel System begin
     @components begin
         volume = FixedVolume(; vol = 10.0, p_int = 0.0)

src/Electrical/Analog/sources.jl

@@ -48,29 +48,4 @@ See [OnePort](@ref)
     end
 end
 
-"""
-    ConstantCurrent(; i=0, name)
-
-Acts as an ideal constant current source with no internal resistance.
-
-# Connectors:
-  - `p`: positive pin
-  - `n`: negative pin
-
-# Parameters:
-  - `i`: input current
 
-"""
-@mtkmodel ConstantCurrent begin
-    @parameters begin
-        i = 0
-    end
-    @components begin
-        p = Pin()
-        n = Pin()
-    end
-    @equations begin
-        0 ~ p.i + n.i
-        i ~ -n.i
-    end
-end

src/Electrical/Electrical.jl

@@ -23,7 +23,7 @@ include("Analog/ideal_components.jl")
 export CurrentSensor, PotentialSensor, VoltageSensor, PowerSensor, MultiSensor
 include("Analog/sensors.jl")
 
-export Voltage, Current, ConstantCurrent
+export Voltage, Current
 include("Analog/sources.jl")
 
 # include("Digital/gates.jl")

src/Hydraulic/IsothermalCompressible/IsothermalCompressible.jl

@@ -19,7 +19,7 @@ include("utils.jl")
 export Cap, Tube, FixedVolume, DynamicVolume
 include("components.jl")
 
-export ConstantMassFlow, MassFlow, Pressure, FixedPressure
+export MassFlow, Pressure, FixedPressure
 include("sources.jl")
 
 end

src/Hydraulic/IsothermalCompressible/sources.jl

@@ -3,29 +3,6 @@
 
 Hydraulic mass flow input source
 
-# Connectors:
-
-  - `port`: hydraulic port
-  - `dm`: real input 
-"""
-@mtkmodel ConstantMassFlow begin
-    @parameters begin
-        p_int
-        dm = 0
-    end
-    @components begin
-        port = HydraulicPort(; p_int)
-    end
-    @equations begin
-        port.dm ~ -dm
-    end
-end
-
-"""
-    MassFlow(; name, p_int)
-
-Hydraulic mass flow input source
-
 # Connectors:
 
   - `port`: hydraulic port

src/Mechanical/Translational/Translational.jl

@@ -18,7 +18,7 @@ include("utils.jl")
 export Mass, Spring, Damper, Fixed
 include("components.jl")
 
-export ConstantForce, Force, Position, Velocity, Acceleration
+export Force, Position, Velocity, Acceleration
 include("sources.jl")
 
 export ForceSensor, PositionSensor

src/Mechanical/Translational/sources.jl

@@ -1,27 +1,3 @@
-"""
-    ConstantForce(; f=0, name)
-
-Linear 1D constant force input source
-
-# Connectors:
-  - `flange`: 1-dim. translational flange
-
-# Parameters:
-  - `f`: input force
-"""
-@mtkmodel ConstantForce begin
-    @parameters begin
-        f = 0
-    end
-    @components begin
-        flange = MechanicalPort()
-    end
-    @equations begin
-        # connectors
-        flange.f ~ -f
-    end
-end
-
 """
     Force(; name)