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Moment
2D/3D

Moment[bnum, mag] (2D) returns a SysLoad data object that applies a moment to body bnum of magnitude mag.
Moment[bnum, vector, mag] (3D) returns a SysLoad data object that applies a moment to body bnum of magnitude mag in the direction of vector.
Moment[bnum1, bnum2, ... ] applies the moment to body bnum1 and also applies a moment in the opposite sense to body bnum2.

• After creation, the SysLoad object is passed to SetLoads to alter the state of the current Mech model.
• The following options can be given:

• In Modeler3D, Magnitude->Relative causes the magnitude of the applied moment to be equal to the specified mag times the length of vector.
• See also: Body, Force, GyroMoment, Load.

Further Examples

Load the Modeler3D package and define a simple model.

Here we apply a force and a moment to the crank and look at the resulting loads applied to each model variable. Because we are using Euler parameters the moment is applied in Euler parameter space.

If we switch to global angular coordinates, then the same force and moment will result in the simplest possible load vector.

In local angular coordinates the applied moment must be transformed because it was specified in global coordinates.

If we redefine the moment in local coordinates, the resulting load vector again requires no transformation.

See HelpModel3D.


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