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.

1: Cleat surface is curved according to drum surface curvature.

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.

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.

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.

acceleration_time

time

Time span at beginning of dynamic simulation, to accelerate drum from stand-still to nominal velocity.

Default value is 0.

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.

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.

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.

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.

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.