Plotting the Angular Displacement, Velocity, or Acceleration of a Part

You can plot the angular displacement, velocity, or acceleration of a part as it moves relative to another part or relative to the assembly origin.

1. From a Motion Analysis study, click Results and Plots (MotionManager toolbar).
2. In the PropertyManager under Result, for Category, select Displacement/Velocity/Acceleration.
3. For Subcategory, select one of the following:
   • Angular Displacement
   • Angular Velocity
   • Angular Acceleration
4. For Select result component, select an option:
   • Magnitude to resolve the magnitude in the direction of the result vector relative to global coordinates.
   • X Component, Y Component, or Z Component to calculate the magnitude of the result projected to the selected direction relative to global coordinates.
     X Component, Y Component, or Z Component options are not available for Angular Displacement.
5. Select features :
   • Select a rotary motor to calculate the result for the angular motion of the location point for the motor.
     For Magnitude, when Component to Move Relative to is blank in the Motor PropertyManager, the result uses the frame of reference of the assembly.

     Angular Displacement	Magnitude gives the relative rotation of the part in the frame of reference of Component to move relative to that is specified in the Motor PropertyManager. Only the magnitude of the angle is given. The angle values are from -180° to 180°.
     Angular Velocity	Magnitude gives the relative angular velocity of the part in the frame of reference of Component to move relative to that is specified in the Motor PropertyManager. X Component, Y Component, or Z Component gives the projection of the angular velocity vector onto the corresponding axis of the global coordinate system unless you select a nonfixed or grounded Component to define XYZ directions .
     Angular Acceleration	Magnitude gives the relative angular acceleration of the part in the frame of reference of Component to move relative to that is specified in the Motor PropertyManager. X Component, Y Component, or Z Component gives the projection of the angular acceleration vector onto the corresponding axis of the global coordinate system unless you select a nonfixed or grounded Component to define XYZ directions.

   • Select a Torsional Spring:
     • For Magnitude, when the base component is blank, the result uses the frame of reference of the assembly,
     • For angular displacement, angular velocity, and angular acceleration, Magnitude follows the right hand rule and can be positive or negative.

     Angular Displacement	Magnitude gives the relative rotation of the first endpoint of the spring relative to the base component about the axis of the spring. The angle values are from -180° to 180°.
     Angular Velocity	Magnitude gives the relative angular velocity of the first endpoint of the spring relative to the base component about the axis of the spring. X Component, Y Component, or Z Component gives the projection of the angular velocity vector onto the local direction of the mate unless you select a nonfixed or grounded Component to define XYZ directions.
     Angular Acceleration	Magnitude gives the relative angular acceleration of the first endpoint of the spring relative to the base component about the axis of the spring. X Component, Y Component, or Z Component gives the projection of the angular acceleration vector onto the local direction of the mate unless you select a nonfixed or grounded Component to define XYZ directions.

   • Select a mate to calculate the result of the relative angular motion of the geometric center of the first entity relative to the geometric center of the second entity.

     The result is computed relative to the global coordinates unless you select X Component, Y Component, or Z Component for the result component.

     For a suppressed angle mate, you can have results for angular displacement, angular velocity, or angular acceleration. You can use a suppressed angle mate to obtain the angle between two entities where you can define an angle mate.

     Angular Displacement	Magnitude gives the relative rotation of the two parts in the mate. Only the magnitude of the angle is given. The angle values are from -180° to 180°. The orientation of the angle is defined by the alignment of the mate.
     Angular Velocity	Magnitude gives the relative angular velocity of the two parts in the mate. X Component, Y Component, or Z Component gives the projection of the angular velocity vector onto the local direction of the mate unless you select a nonfixed or grounded Component to define XYZ directions.
     Angular Acceleration	Magnitude gives the relative angular acceleration of the two parts in the mate. X Component, Y Component, or Z Component gives the projection of the angular acceleration vector onto the local direction of the mate unless you select a nonfixed or grounded Component to define XYZ directions.

   • Select three noncollinear points to an angle that specifies an angular displacement result, which calculates the motion of the angle as the points move with the assembly. Select the first two points, P1 and P2, on separate parts and the third point, P3, to specify the initial angle between the points.

     

     Angular Displacement

     Magnitude gives the angle at P3 of the [P1, P3] and [P3, P2] segments. Only the magnitude of the angle is given and the magnitude is always positive. The angle values are from 0° to 180°.

   • Select one face to calculate the result for the angular motion of the face.

     Angular Displacement	Magnitude gives the angle between the normal projection of the x axis of the part onto the global XY plane and the global X axis. The projection of the x axis is done in the global Z direction. The angle is measured in the trigonometrical direction and the angle values are from -180° to 180°. For example, the xyz of the part projects onto the global XY plane. The α angle shows the angular displacement. The angle is not necessarily null at time = 0s.
     Angular Velocity	Magnitude gives the absolute angular velocity of the face which is the magnitude of the angular velocity vector of the part in the global coordinate system. X Component, Y Component, or Z Component gives the projection of the angular velocity vector onto the corresponding axis of the global coordinate system unless you select a nonfixed or grounded Component to define XYZ directions.
     Angular Acceleration	Magnitude gives the absolute angular acceleration of the face which is the magnitude of the angular velocity vector of the part in the global coordinate system. X Component, Y Component, or Z Component gives the projection of the angular acceleration vector onto the corresponding axis of the global coordinate system unless you select a nonfixed or grounded Component to define XYZ directions.

   • Select two faces to calculate the result for relative angular motion of the first face relative to the frame defined by the second face.

     Angular Displacement	Magnitude gives the angle between the normal projection of the x axis of the first part onto the xy plane of the second part and the x axis. The projection of the x axis is done in the z direction of the second part which may be moving with time. The angle is measured in the trigonometrical direction and the angle values are from -180° to 180°. For example, the coordinate system xyz of the first part projects onto the x'y' plane of the second part (green). The angle shows the angular displacement. The angle is not necessarily null at time = 0s.
     Angular Velocity	Magnitude gives the relative angular velocity of the part relative to the second part which is the magnitude of the angular velocity vector of the part in the frame of the second part. X Component, Y Component, or Z Component gives the projection of the angular velocity vector onto the corresponding axis of the global coordinate system unless you select a nonfixed or grounded Component to define XYZ directions.
     Angular Acceleration	Magnitude gives the relative angular acceleration of the part relative to the second part which is the magnitude of the angular velocity vector of the part in the frame of the second part. X Component, Y Component, or Z Component gives the projection of the angular acceleration vector onto the corresponding axis of the global coordinate system unless you select a nonfixed or grounded Component to define XYZ directions.

   Selected part origins are indicated with a small white sphere .

   The origin is difficult to see when using a white background.

6. Select the Plot Results options and click .
   The result appears in the MotionManager design tree.
7. Click Calculate (MotionManager toolbar).