Adams Basic Package > Adams View > Adams View > Building Models > Motion > Applying Joint Motion

Applying Joint Motion

Creating Joint Motion

When you create a Joint motion, Adams View creates a motion at the specified joint. It defines the motion as a constant velocity over time based on a speed value that you can enter. The speed value can be a numerical value, function expression, or User-written subroutine.
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To create a joint motion:

1. From the Joint palette or Motion tool stack, select the joint motion tool representing the motion that you want to create. Select either:
■ to create a translational motion.
■ to create a rotational motion.
2. In the settings container, specify the speed of the motion in displacement units per second. By default, Adams View creates a rotational motion with a speed of 30 degrees per second and a translational motion with a speed of 10 millimeters per second.
To enter a function expression or user-written subroutine, right-click the Speed text box, point to Parameterize, and then select Expression Builder to display the Adams View Function Builder. For information on using the Function Builder, see Function Builder and Adams View Function Builder online help.
3. Use the left mouse button to select the joint on the screen to which the motion will be applied.

Modifying Joint Motion

You can change several properties about a Joint motion after you create it. The properties include:
■Joint to which the motion is applied.
■Motion direction, either rotational or translational.
■Motion definition, including how the motion magnitude is defined (displacement, velocity, or acceleration) and the function that defines its magnitude. You can enter a numerical value, function expression, or User-written subroutine for the magnitude (MOTSUB). For more information on MOTSUB, see Subroutines section of the Adams Solver help.
■Initial conditions for displacement and velocity. Adams View uses the initial conditions during an Initial conditions simulation, which it runs before it runs a simulation of your model. You can specify the following initial conditions:
■Initial displacement that defines the translation of the first part, in units of length or angles, relative to the second part. You can set initial displacement on any joint motion whose magnitude is defined as velocity or acceleration.
■Initial velocity that defines the velocity of the first part with respect to the second part, in units of length or angles per unit of time. You can set initial velocity on any joint motion whose magnitude is defined as acceleration.
 
Note:  
You can also modify joint properties using the Table Editor.

To modify a joint motion:

1. Display the Joint Motion dialog box as explained in Accessing Modify Dialog Boxes.
2. If desired, in the Joint text box, change the joint to which the motion is applied. The Joint Type text box automatically updates to the selected type of joint.
3. Set Direction to the desired motion direction (rotational or translational). You can select only translational motion for a translational or cylindrical joint. You can select only rotational motion for a revolute or cylindrical joint.
4. Set Define Using to how you will define the motion.
If you selected Function, enter the following in the Function (time) text box that appears:
♦Numerical value (For rotational motion, specify the magnitude in radians.)
To enter a function expression, next to the Function (time) text box, select the More tool to display the Adams View Function Builder. For information on using the Function Builder, see Function Builder and Adams View Function Builder online help.
If you selected Subroutine, enter the parameters to be passed to a User-written subroutine MOTSUB and its ID or you can specify an alternative library and name for the user subroutine in the Routine text box. For more on subroutines, see the Subroutines section of the Adams Solver online help. Learn about specifying your own routine with ROUTINE Argument.
5. Set Type to Displacement, Velocity, or Acceleration to specify how motion magnitude is defined.
6. In the Displacement IC or Velocity IC text boxes, enter the initial conditions for displacement or velocity. The text boxes that appear depend on how the magnitude of the motion is defined.