TeimOrbit 2D Road Type: hydraulic_test_rig
A general, time history driven servohydraulic test rig excitation (eventually combined with
a flatbelt test rig) is implemented as another 2D road type. If the ROAD_TYPE is set to
hydraulic_test_rig, COSIN/road searches and reads the following data items in the
[PARAMETERS] section:
| Name of input variable | Unit | Meaning |
|---|---|---|
| sampling_time | time | Assumed time increment of wheel support displacement values, if no separate time channel is provided. |
| flat_belt_velocity | length/time | Optional time span at beginning of simulation, during which an optional,
additional flatbelt device is accelerated from stand-still to nominal
speed. Default value is 0 (no additional flatbelt). |
| acceleration_time | time | Time span at beginning of dynamic simulation, to accelerate the flatbelt
device from stand-still to nominal velocity. Default value is 0. |
The wheel support displacement (either purely in vertical (z) direction, or fully spatial in x/y/z direction) is defined by one of the following alternatives:
Either:
| data sub-section (Z_DATA) | Arbitrarily many lines with a single value of type: length | Values defining time-dependent vertical wheel support displacement values. Time values are assumed to be equidistant, with increment defined by sampling_time. |
Or:
| data sub-section (XYZ_DATA) | Arbitrarily many lines with 3 values each of type:3 x length | Data triples defining x/y/z data of the time-dependent spatial wheel support displacement. Time values are assumed to be equidistant, with increment defined by sampling_time. |
Or
| data sub-section (TZ_DATA) | Arbitrarily many lines with 2 values each of type: time, length | Data defining t and z data of the time-dependent spatial wheel support displacement. Time values must be in ascending order. x and y displacements are set to zero. |
Or:
| data sub-section (TXYZ_DATA) | Arbitrarily many lines with 4 values each of type:time, 3 x length | Data defining t/x/y/z data of the time-dependent spatial wheel support displacement. Time values must be in ascending order. |
Or:
| data sub-section (TXYZV_DATA) | Arbitrarily many lines with 5 values each of type:time, 3 x length, length/time | Data defining t/x/y/z data of the time-dependent spatial wheel support displacement, and in addition velocity of the flatbelt device. Time values must be in ascending order. |