WOLFRAM SYSTEM MODELER

Torque

Torque acting between two frames, defined by 3 input signals and resolved in frame world, frame_a, frame_b or frame_resolve

Diagram

Wolfram Language

In[1]:=
SystemModel["Modelica.Mechanics.MultiBody.Forces.Torque"]
Out[1]:=

Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

The 3 signals of the torque connector are interpreted as the x-, y- and z-coordinates of a torque acting at the frame connector to which frame_b of this component is attached. Via parameter resolveInFrame it is defined, in which frame these coordinates shall be resolved:

Types.ResolveInFrameAB.Meaning
world Resolve input torque in world frame
frame_a Resolve input torque in frame_a
frame_b Resolve input torque in frame_b (= default)
frame_resolve Resolve input torque in frame_resolve (frame_resolve must be connected)

If resolveInFrame = ResolveInFrameAB.frame_resolve, the torque coordinates are with respect to the frame, that is connected to frame_resolve.

If torque={100,0,0}, and for all parameters the default setting is used, then the interpretation is that a torque of 100 N.m is acting along the positive x-axis of frame_b.

Note, the cut-forces in frame_a and frame_b (frame_a.f, frame_b.f) are always set to zero and the cut-torque at frame_a (frame_a.t) is the same as the cut-torque at frame_b (frame_b.t) but with opposite sign.

An example how to use this model is given in the following figure:

This leads to the following animation (the yellow cylinder characterizes the line between frame_a and frame_b of the Torque component, i.e., the torque acts with negative sign also on the opposite side of this cylinder, but for clarity this is not shown in the animation):

Parameters (2)

animation

Value: true

Type: Boolean

Description: = true, if animation shall be enabled

resolveInFrame

Value: Modelica.Mechanics.MultiBody.Types.ResolveInFrameAB.frame_b

Type: ResolveInFrameAB

Description: Frame in which input force is resolved (1: world, 2: frame_a, 3: frame_b, 4: frame_resolve)

Inputs (4)

connectionLineDiameter

Default Value: world.defaultArrowDiameter

Type: Diameter (m)

Description: Diameter of line connecting frame_a and frame_b

torqueColor

Default Value: Modelica.Mechanics.MultiBody.Types.Defaults.TorqueColor

Type: Color

Description: Color of torque arrow

connectionLineColor

Default Value: Modelica.Mechanics.MultiBody.Types.Defaults.SensorColor

Type: Color

Description: Color of line connecting frame_a and frame_b

specularCoefficient

Default Value: world.defaultSpecularCoefficient

Type: SpecularCoefficient

Description: Reflection of ambient light (= 0: light is completely absorbed)

Connectors (4)

frame_a

Type: Frame_a

Description: Coordinate system a fixed to the component with one cut-force and cut-torque

frame_b

Type: Frame_b

Description: Coordinate system b fixed to the component with one cut-force and cut-torque

frame_resolve

Type: Frame_resolve

Description: The input signals are optionally resolved in this frame

torque

Type: RealInput[3]

Description: x-, y-, z-coordinates of torque resolved in frame defined by resolveInFrame

Components (5)

world

Type: World

Description: World coordinate system + gravity field + default animation definition

torqueArrow

Type: DoubleArrow

Description: Visualizing a double arrow with variable size

connectionLine

Type: Shape

Description: Visualizing an elementary object with variable size; all data have to be set as modifiers (see info layer)

basicTorque

Type: BasicTorque

Description: Torque acting between two frames, defined by 3 input signals

zeroPosition

Type: ZeroPosition

Description: Set absolute position vector of frame_resolve to a zero vector and the orientation object to a null rotation

Used in Examples (3)

ActuatedDrive

Modelica.Mechanics.MultiBody.Examples.Rotational3DEffects

Demonstrates usage of models Rotor1D and Mounting1D

MovingActuatedDrive

Modelica.Mechanics.MultiBody.Examples.Rotational3DEffects

Demonstrates usage of model Rotor1D mounted on a moving body

GearConstraint

Modelica.Mechanics.MultiBody.Examples.Rotational3DEffects

Demonstrate usage of GearConstraint model