COSIN/io 2D Road Type: sine_sweep
Linear sweep
The frequency increases linearly with respect to travel distance. The road height value z(s) as function of travel distance s is calculated as follows:
Note: The factor 2 in the denominator is not an error!
The actual frequency (= derivative of the sine function argument with respect to travel path, divided by 2π; this is not equal to the factor that is multiplied by in the sine function!) is given by: 2π(s - ss)
Logarithmic sweep
The wave length decreases by a constant factor with every cycle. The road height value is calculated as follows:
where,
is the travel path that theoretically an infinitely high
frequency is reached, measured relative to sweep start 
. The actual
frequency is given by:
For data supply, COSIN/road searches for the data block $sine_sweep, and reads:
| Name of input variable | Unit | Meaning |
|---|---|---|
| start | m | Start of swept sine wave (travel distance). |
| end | m | End of swept sine wave (travel distance) |
| amplitude_at_start | mm | Amplitude of swept sine wave at start. |
| amplitude_at_end | mm | Amplitude of swept sine wave at end. |
| wave_length_at_start | m | Wave length of swept sine wave at start. |
| wave_length_at_end | m | Wave length of swept sine wave at end. Must be less than or equal to wave_length_at_start. |
| sweep_type | 0/1 |
|