Identifying interference

In this tutorial, you will create an interference object, articulate the mechanism, and find the maximum distance that the wheel can turn before interference occurs.

1: Setup

  1. On your desktop or the appropriate network drive, create a folder named interference.

  2. Click the link below.

    Download the part

  3. Extract the files to your interference folder.

  4. Start Simcenter 3D or NX.

File

Open

  • Navigate to the interference folder you created.

  • Files of type:

    Simulation Files (*.sim)

  • File name

    interference_sim.sim

  • OK

     
Note:

To facilitate the view of the affected parts, the tire is displayed with translucency.

2: Reset dialog box memory

The options you select in dialog boxes are preserved for the next time you open the same dialog box within a given session. Restore the default settings to ensure that the dialog boxes are in the expected initial state for each step of the activity.

File

Preferences→User Interface

  • Options

  •   Reset Dialog Memory

  • OK

     
3: Create the interference object

The area of concern is whether the knuckle (1) will bump into the lower arm (2) as the steering housing pulls the steering rod inward.

View

Layer Settings (Visibility group)

  •  

  • Work Layer

    1

  • Enter

     

  • This saves the solid bodies that are created during the interference check on a separate layer.

  • Close

     

Analysis

Interference (Motion group)

  • Type

    Create Solid

    This option creates solid bodies from the area of interference.

  • Type Filter (Top Border bar)

    Solid Body

  • Note:

    In the Interference dialog box, you use Select Object in the First Set group for both of these parts because you are checking for interference between two objects in one set of geometry.

    To select two sets of geometry, you use Select Object in the First Set group to specify the first set of geometry and Select Object in the Second Set group to specify the second set. The software checks for interference between each object in the first set and each object in the second set.

    Because the bodies are not components, the software ignores the Clearance value. The Clearance value is used only when the objects you select are assembly components. It defines the minimum allowable distance between two components.

  • Leave the Stop On Event and Make Active check boxes selected.

  • OK

     
4: Create an articulation solution

  Motion Navigator

  •  interference_sim

  • New Solution

  • Solution Type

    Articulation

  • Solve with OK

  • OK

     

    The Articulation dialog box opens.

5: Articulate the mechanism

You will turn the wheel to the left, which causes the knuckle to rotate. This rotation eventually causes an interference.

The Articulation dialog box is still open from the previous step.

  • J008

  • Step Size

    15

  • Number of Steps

    5

  •  

  • Interference

  • Stop on Event

  • Step Forward

    The articulation stops, the interfering parts are highlighted, and a message box indicates that a part interference has occurred.

  • OK

     message box

    In the Articulation dialog box, the Displacement column shows you the distance that the steering had moved when the interference occurred.

  • Close

     

File

  • Close→All Parts