Adams Car Package > Adams Car Ride > Dialog Box - F1 Help > Road-Profile Generation

Road-Profile Generation

Ride -> Tools -> Road-Profile Generation
Generates a road profile using the Sayers (see References) model. Learn about Road-Profile Generation Tool.
 
For the option:
Do the following:
Elevation PSD Parameter: Ge
Enter a value for the Ge parameter.
Velocity PSD Parameter: Gs
Enter a value for the Gs parameter.
Acceleration PSD Parameter: Ga
Enter a value for the Ga parameter.
Profile Length
Enter the length of the road whose profile you want the model to approximate.
Sample Interval
Enter the distance between profile data points. Sample interval is the same as the absolute value of the difference in the Station of two adjacent data points.
Correlation Baselength
Enter the quantity LB (used in Equation  (3)).
Output Filename For RPC III File
Enter the full path to a file that Adams Car Ride will create to store the profile data. Adams Car Ride stores the data in the RPC III file format (Learn about RPC III Format). This is a binary file format developed by MTS [4]. The file will contain two channels: channels 1 and 2, which will contain the profile data for the left and right wheeltracks, respectively. The independent variable of the file is station, measured in meters (m). The two dependent variables (channels 1 and 2) are road elevation, measured in millimeters (mm).
After you create the RPC file, you can view it in Adams PostProcessor. To do so, go to Adams PostProcessor (F8), select File -> Import -> RPC File, and then select the file you created. Plot the two channels: LElev and RElev. Note that the y-axis will be labeled mm, but the x-axis will be labeled No Units. The actual units are meters (m), but, currently the RPC III file format doesn't provide a way to store this information, so there is nothing in the file that Adams PostProcessor could use to create the units label for the x-axis.
The following channel names appear in Adams PostProcessor, when you import the file and plot it. Normally, however, you access the RPC III files by referring to channel numbers rather than channel names.
Channel Name for Left Wheeltrack
Enter a name for channel 1.
Channel Name for Right Wheeltrack
Enter a name for channel 2.
Seed For Random Numbers
Enter an integer that determines how the random-number generator (used for creating a Gaussian distribution for the Sayers model) is seeded.
■If the seed is negative, for example, -1, Adams Car Ride uses the computer's clock as a seed. Therefore, multiple RPC III files created for the same set of profile parameters will be different. An infinite number of profiles can be generated to match the same set of Sayers-model parameters.
■If the seed is greater than zero, Adams Car Ride uses the value of the seed as the seed to the random-number generator. Therefore, each RPC III file created for the same set of parameters, and the same seed, will be identical. This, then, is a means of generating reproducible profiles with the Sayers model.