6.2.3.9. Cartesian Motion (CMotion)

A cmotion joint is the Cartesian driving constraint for a selected translational or rotational degree of freedom of a reference frame. Either of the x, y, or z component of the action marker relative to the base marker is constrained by the specified function. The definition of a valid function expression is explained in Function Expression.

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Figure 6.222 CMOTION (Cartesian Motion) icon on Working Window

6.2.3.9.1. Modeling Options

The user can create a joint entity as follows.

  • Point, Point

    • Point: Selects a point on a base body.

    • Point: Selects a point on an action body.

  • Body, Body, Point, Point

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

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

    • Point: Selects a point.

    • Point: Selects a point.

6.2.3.9.2. Properties

The user can define motion and initial conditions using the Joint page.

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Figure 6.223 CMOTION property page [Joint page]

  • Type: Shows the type of joint.

  • Cartesian Motion Type: Specifies the degree of freedom to be constrained as X, Y, Z and RX, RY, RZ. And the user selects a type of the following types.

    • Displacement(time): Defines as the displacement type

    • Velocity Time(time): Defines as the velocity type

      • Initial Position: Defines the initial position.

    • Acceleration(time): Defines as the acceleration type

      • Initial Position: Defines the initial position.

      • Initial Velocity: Defines the initial velocity.

    • Position Component between Two Markers: Shows the displacement of two markers. Reloads when clicking R.

    • Reference Marker: Defines the reference frame of the Cartesian coordinates. The default value is the inertia marker of the ground.

  • Expression: Defines the expression of the Cartesian motion.

    • Name: Shows the name of the applied expression.

    • If the CMotion joint is connected to an FFlex body that is include in Position and Velocity Pre-Analysis and the CMotion joint specifies a rotation, then the rotation’s initial value should be greater than -90 degrees and less than 90 degrees.

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