TeimOrbit 2D Road Type: drum

The rotating drum is implemented as a 2D type road. If the ROAD_TYPE is set to drum, COSIN/road searches for and reads the following data items in the [PARAMETERS] section:

Name of Input Variable	Unit	Meaning
`diameter`	length	Diameter of the tire test drum. COSIN/road assumes outer drum, if the diameter < 0.
`x_coord_drum_center`	length	x coordinate of drum center in global coordinates, used for all wheels. Remark: Be sure to place the drum near the rim center, and keep the wheel's translational speed small enough not to leave the drum's zenith.
`y_coord_drum_center`	length	y coordinate of drum center in global coordinates, used for all wheels.
`x_coord_drum_center_wheel_i (i = 1,2,3,..,25)`	length	x coordinate of drum center in global coordinates, used only for wheel i (i = 1,2,3,..,25).
`y_coord_drum_center_wheel_i (i = 1,2,3,..,25)`	length	y coordinate of drum center in global coordinates, used only for wheel i (i = 1,2,3,..,25).
`number_cleats`	-	Number of extra cleats on drum (`number_cleats` = 0 allowed).
`cleat_starting_angle`	angle	Drum angle coordinate of 1st cleat, used for all wheels.
`cleat_starting_angle_wheel_i (i = 1,2,3,..,25)`	angle	Drum angle coordinate of 1st cleat, used only for wheel i (i = 1,2,3,..,25).
`cleat_direction`	angle	Direction of cleat relative to drum spin axis. Direction is zero if cleat is oriented exactly in transversal direction. Direction angle is measured counter-clockwise if looking from above onto the drum surface. Default value is 0 (transversal cleat).
`curved_cleat_surface`	-	0 Cleat surface is flat. Figure 1. 1 Cleat surface is curved according to drum surface curvature. Figure 2. Default value is 0 (flat).
`flat_cleat_support`	-	0 Cleat is mounted on the drum such that its support on the drum surface is curved according to overall drum curvature. Figure 3. 1 Cleat is mounted on the drum such that its support on the drum surface is flat between cleat's start and cleat's end. Figure 4. Default value is 0 (non-flat cleat support). This parameter is only used and relevant if `curved_cleat_surface` = 0.
`mu_factor_cleat`	-	Friction modification factor on cleats.
`stopper_distance`	length	Distance between front and read stopper of drum opening. Default value is 75% of drum diameter.

Either:


v	length/time	Constant rotation speed of drum surface
`acceleration_time`	time	Time span at beginning of dynamic simulation, to accelerate drum from stand-still to nominal velocity. Default value is 0.

Or:

data sub-section (TV_DATA)

Arbitrarily many lines with 2 values of type: time, length/time

Data pairs defining speed-vs.-time data of the drum’s time-dependent surface speed profile. t-values (first value in each line) should be in ascending order.

Either:


cleat_height	length	Height of cleats.
cleat_length	length	Length of cleat, measured in circumferential direction of drum.
cleat_bevel_edge_length	length	Length of bevel edge of cleat, measured in circumferential direction of drum. Bevel edge has 45 degree slope.
cleat_edge_rounded		0 Cleat bevel edge is flat. 1 Cleat bevel edge is rounded by a quarter circle.

Or

data sub-section (XZ_DATA)

Arbitrarily many lines with data of type: 2 x length

Data pairs defining x and z data of the cross section of the cleat. No rounding of edges is assumed. x values should be in ascending order. First and last y value should be zero.

Or:

data sub-section (XZR_DATA)

Arbitrarily many lines with data of type: 3 x length

Data triples defining x and z data of the cross section of the cleat, together with rounding radii in these data points. Rounding radii may be zero. x values should be in ascending order. First and last y value should be zero.

Optionally, the exact height geometry of the stoppers can be specified by spline data:

data sub-section (stopper_geometry)

Arbitrarily many lines with data of type: 2 x length

Data pairs defining x and z data of the stoppers. x values must be non-negative and ascending: x = 0 refers to the start in longitudinal direction of the stopper.