Auto Tracking

Detect the path along which a vehicle must travel.

A tracking path is the path that is used in simulating vehicle movement. This path can be defined by drawing lines and arcs in CAD. There are, however, a couple of guidelines to follow when doing this:

• The tracking path must start and end with a straight line.

• When reverse simulation around a curve has to be done, a straight line must follow each curve.

• The path can be drawn in any CAD layer, but it makes sense to draw it in a separate layer.

It is a good idea to use the Line-Arc-Line function for this purpose.

The tracking path that has been drawn must now be coordinated before a simulation can be done. 

Use the Auto Define function if the path has been drawn in the same sequence as the desired vehicle movement. 

Procedure

1. You are prompted to:

Indicate the start entity of the track path

2. You are prompted to indicate the start of the path and the program automatically tracks the path.

3. You are asked:

4. Click Yes to accept the track path and coordinate it.

5. The program now calculates coordinates according to the Coordination Interval value specified in the Setup, along the specified path. These coordinates are kept in memory until you run the Define Path option again.

Remember that it is impossible for a driver to follow a predefined tracking path along a real roadway exactly.  Therefore, the results must be used rather conservatively and extra allowance beyond the generated envelopes must be made for driver variation, according to sound engineering discretion.