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.