6.2.3.10. OnOff

An OnOff joint is a constraint for a selected translational or rotational degree of freedom of the action reference frame. Either of x, y, or z component of the action marker relative to the base marker is constrained. These constraints can be turned on or off by the specified function. The definition of a valid function expression is explained in Function Expression.

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Figure 6.224 OnOff icon on Working Window

6.2.3.10.1. Modeling Options

The user can create a joint entity as follows.

  • Body, Body, Point

    • Body: Selects a base body of the onoff joint.

    • Body: Selects an action body of the onoff joint.

    • Point: Selects a point to define the location of the onoff joint.

  • Body, Body, Point, Direction

    • Body: Selects a base body of the onoff joint.

    • Body: Selects an action body of the onoff joint.

    • Point: Selects a point to define the location of the onoff joint.

    • Direction: Defines the z-axes of base and action markers.

  • Body, Body, Point, Direction, Direction

    • Body: Selects a base body of the onoff joint.

    • Body: Selects an action body of the onoff joint.

    • Point: Selects a point to define the location of the onoff joint.

    • Direction: Defines the z-axes of base and action markers.

    • Direction: Defines the x-axes of base and action markers.

6.2.3.10.2. Properties

The user can define constraints and conditions using the Joint page.

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Figure 6.225 OnOff joint property page [Joint page]

  • Type: Shows the type of joint.

  • Constraint: Specifies the degree of freedom to be constrained as Translational X, Translational Y, Translational Z and Rotational X, Rotational Y, Rotational Z. And the user selects DOF combinations.

    • For Example

      • Fixed Condition: All Constraint is selected. (default)

      • Spherical Condition: Translational X, Y, and Z constraints are selected.

  • Expression: Defines the expression of the OnOff.

    • Include On Condition: The constraint can be turned on by expression. If the check box is checked and the expression value is not equal to zero, the OnOff joint works as a constraint. The default is unchecked. It means the OnOff joint works as a constraint.

  • Force Display: Displays the resultant force vector graphically on Working Window.