An action-only moment is applied at a point on a single rigid body, and no reaction forces are calculated. The action/reaction moment is applied between two points—the moment is applied to the first rigid body, and an equal but opposite reaction moment is applied to the second rigid body. Learn more about forces.
To create an action-only moment:
Display the Insert Action-Only Moment dialog box using one of the following methods:
From the Motion menu, point to Forces and then select Action-Only Moment.
In the browser, right-click the Forces branch and then select Add Action-Only Moment.
In the browser, right-click the Action-Only branch and then select Add Action-Only Moment.
Select one moving part in the browser, and then select Add Force Action-Only Moment.
If not already selected, select the Definition tab.
Select the component to which the moment is going to be applied.
Optionally, select a second component to serve as a reference frame for the moment. If no component is chosen, the reference frame is the global ground.
In the Select Location text box, select a vertex, circular edge, or linear edge to define the point at which the moment is applied.
In the Select Direction text box, select an edge or a face to define the axis about which the moment is acting.
Select the Reverse axis direction button to switch the moment to the opposite direction.
Select the Function tab.
Set Function
Type to Step,
Harmonic,
Spline, or
Expression. Complete the options for the function.
If you choose Expression, you can use the Function Builder to add Step,
Harmonic, or Spline functions. If there is an expression in the Force
Expression text box that is not highlighted, the Function Builder adds
the new function to the existing expression. If the expression is highlighted,
it is replaced by the expression created in the Function Builder. Learn
about the Function Builder.
Select Apply to create the moment and close the dialog box.