Altair Driver File
The Altair Driver File event allows you to run your own Altair Driver File and use this file in the event.
You can begin with an existing event and modify it, or you can write your own event file. Additional information on writing the events can be found in the online help. A graphical user interface to populate critical items in the events is not currently supported.
Figure 1.
See the Altair Scripted Driver topic to learn more about Altair Driver.
- Road Parameters
- Use the road parameters to select the road that the vehicle drives on for the event.
You can choose to use a flat road, a road data file you select from the event editor, or
the road data files selected by tires. The table below describes the parameters in
detail.
Parameter Description Road Selection This option menu determines the road selected for the event. There are three choices: - Flat Road - Use a flat, smooth road for the event. No road file is needed. Use the road settings to control the road graphics and road mu.
- From Event - Select a road file from the event road file field. All tires in the model use this road file when running the event.
- From Tires - For each tire in the model, use the road file selected for that tire in the AutoTire panel. This allows you to use different road files for different tires.
Road Selection = Flat Road When the road Selection is Flat Road, then the event is run on automatically generated flat road data file.
Mu (Friction Scale) Enter a value greater than or equal to zero that scales the tire-road surface friction. Note the tire-road surface friction is defined in the tire properties. So, if you enter a 0.5 here and the tire-road friction coefficient is 0.8, the effective coefficient of friction is 0.5*0.8 = 0.4. Show Graphics Check this box to create graphics for the flat road. Note the graphics are created when you click the Apply or Run button on the event editor. Graphic Settings Push this button to display a dialog that controls the flat road graphics, to learn more about the controls see the Road Settings section below. Road Selection = From Event Road File When the Road Selection option is From Event, use the road file field to select the road file for the event. Road Selection = From AutoTires
When the Road Selection is From AutoTires, then each tire runs on the road property file specified for it in the AutoTire panel. This allows the use of different road files for different tires, for example, one road for the right tires and another for the left tires to provide different vertical disturbance.
Road Settings
The Road Settings dialog controls the display of the rectangular road graphics.
Figure 2. Road Setting Dialog
Grid Parameters
| Parameter | Description |
|---|---|
| View Grid Road | The View Grid Road check box toggles the road grid graphics on and off. |
| View Event Path | The View Event Path check box toggles the event path
graphics on and off. Note: This check box is disabled for open loop events without
a path.
|
| Event Based Grid | Check the Event Based Grid option to automatically size the length and width of the road graphics based on the event parameters, like the initial straight and radius for the constant radius event. Remove the check from the Event Based Grid option to input the size of the road graphics. |
| Grid Square Size | Enter a positive value in model units giving the length and width of squares in the road graphics. |
| Grid Length | Enter a positive value in model units giving the length of the road graphics. |
| Grid Width | Enter a positive value in model units giving the width of the road graphics. |
| Grid X Offset | Enter a value in model units giving the distance to offset the road graphics in the longitudinal direction. |
| Grid Y Offset | Enter a value in model units giving the distance to offset the road graphics in the lateral direction. |