Name | Description |
---|---|
![]() | model of a linear damper |
![]() | model of a linear spring |
The damper generates a counteracting force that is proportional to the relative velocity.
The damping coefficient can be set by the parameter d.
Type | Name | Default | Description |
---|---|---|---|
Real | d | 0 | Damping constant [N.s/m] |
Type | Name | Description |
---|---|---|
IFrame_a | frame_a | |
IFrame_b | frame_b |
model Damping "model of a linear damper" parameter Real d( final unit="N.s/m", final min=0) = 0 "Damping constant"; Interfaces.IFrame_a frame_a; Interfaces.IFrame_b frame_b; protected Interfaces.ConnectContinousFrame ConnectContinousFrame1; Interfaces.ConnectContinousFrame ConnectContinousFrame2; Mechanics3D.Forces.Damping Damping1(d=d); equation connect(ConnectContinousFrame2.frame_b, frame_a); connect(ConnectContinousFrame1.frame_b, frame_b); connect(Damping1.frame_a, ConnectContinousFrame2.frame_a); connect(Damping1.frame_b, ConnectContinousFrame1.frame_a); end Damping;
The spring generates a counteracting force that is linear dependent on the positional shift.
The spring coefficient can be set by the parameter c. The rest lenght can be specified by the parameter s0.
A spring with a rest length s0 unequal to zero, has a stiff behavior if its length is approaching zero. The parameter s_small in the advanced menu reduces this stiffness for spring lengths ranging from zero up to s_small.
Type | Name | Default | Description |
---|---|---|---|
Boolean | animation | true | animate spring |
Real | c | 0 | Spring constant [N/m] |
Position | s0 | 0 | rest length of spring [m] |
Advanced | |||
Position | s_small | 1e-4 | critical Spring length [m] |
Animation | |||
if animation = true | |||
Distance | width | world3D.defaultForceWidth | Width of spring [m] |
Distance | coilWidth | width/5 | Width of spring coil [m] |
Integer | numberOfWindings | 5 | Number of spring windings |
Color | color[3] | world3D.defaultForceElementC... | Color of spring |
Type | Name | Description |
---|---|---|
IFrame_a | frame_a | |
IFrame_b | frame_b |
model Spring "model of a linear spring" import SI = Modelica.SIunits; import MB = Modelica.Mechanics.MultiBody; parameter Boolean animation = true "animate spring"; parameter Real c( final unit="N/m", final min=0) = 0 "Spring constant"; parameter SI.Position s0 = 0 "rest length of spring"; parameter SI.Position s_small = 1e-4 "|Advanced||critical Spring length"; parameter SI.Distance width= world3D.defaultForceWidth "|Animation|if animation = true| Width of spring"; parameter SI.Distance coilWidth=width/5 "|Animation|if animation = true| Width of spring coil"; parameter Integer numberOfWindings=5 "|Animation|if animation = true| Number of spring windings"; parameter MB.Types.Color color= world3D.defaultForceElementColor "|Animation|if animation = true| Color of spring"; Interfaces.IFrame_a frame_a; Interfaces.IFrame_b frame_b; protected outer World3D world3D; Interfaces.ConnectContinousFrame ConnectContinousFrame1; Interfaces.ConnectContinousFrame ConnectContinousFrame2; Mechanics3D.Forces.Spring Spring1( animation=animation, c=c, s0=s0, s_small=s_small, width=width, coilWidth=coilWidth, numberOfWindings=numberOfWindings, color=color); equation connect(ConnectContinousFrame2.frame_b, frame_a); connect(ConnectContinousFrame1.frame_b, frame_b); connect(Spring1.frame_b, ConnectContinousFrame1.frame_a); connect(Spring1.frame_a, ConnectContinousFrame2.frame_a); end Spring;