Adams Tire: Friction ellipse

[voo34]

Hi,

In MSC Adams Car - Tire manual, to calculate Fx and Fy for combined slip conditions, this equation can be used:

I coded this equation in MATLAB, but there are some of points i cannot understand:

1- My road's friction coefficient is 0.37. How can i handle this value? Is it mu_x,max and mu_y,max? (mux_max = muy_max = 0.37 ?)

2- What is mu_act?

Do you have an example for this formulation?

Thanks a lot!

 

[GregLocock]

Road friction is handled in the rdf file, for example. As to the rest, it is probably explained near the bit you quote.

$---------------------------------------------------------------------MDI_HEADER
[MDI_HEADER]
FILE_TYPE = 'rdf'
FILE_VERSION = 5.00
FILE_FORMAT = 'ASCII'
(COMMENTS)
{comment_string}
'flat 2d contact road for testing purposes'
$--------------------------------------------------------------------------UNITS
[UNITS]
LENGTH = 'mm'
FORCE = 'newton'
ANGLE = 'radians'
MASS = 'kg'
TIME = 'sec'
$--------------------------------------------------------------------------MODEL
[MODEL]
METHOD = '2D'
FUNCTION_NAME = 'ARC901'
ROAD_TYPE = 'flat'
$-----------------------------------------------------------------------GRAPHICS
[GRAPHICS]
LENGTH = 2000000.0
WIDTH = 1000000.0
NUM_LENGTH_GRIDS = 200
NUM_WIDTH_GRIDS = 100
LENGTH_SHIFT = 20000.0
WIDTH_SHIFT = 0.0
$---------------------------------------------------------------------PARAMETERS
[PARAMETERS]
MU = 0.37
$-------------------------------------------------------------------------RESSYS
[REFSYS]
OFFSET = 0.0 0.0 0.0
ROTATION_ANGLE_XY_PLANE = 0.

Cheers

Greg Locock


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