NXMUO

NXMU3

XMU3

NXM14

XMU4

Units

30

Card:  Field

Variable

Description

Original Units

Metric Units

Polygon Friction Zone Option Inputs:

The original version of the SMAC program included the provision for two friction zones specified by a line. The logic for the friction zones was that for the area on the origin side of the specified friction zone line was specified as friction zone 1. The area on the non-origin side of the line was specified as friction zone 2.

m-smac has added the additional option to specify up to two irregularly shaped polygon friction zone areas. The inputs are specified on cards 30, 31 and 32. Up to a maximum of twelve points may be used to define each optional polygon friction  zone. The polygon friction zone logic specifies that for any tire within a polygon friction zone, the friction coefficient is set to the friction coefficient of the polygon friction zone. For any tire not within a polygon friction zone, the original SMAC logic for friction zones (described above) applies.

30:1

NXMUO

No. of polygon friction zones (2 max).

30:2

NXMU3

No. of points in polygon friction zone 1 (48 max).

30:3

XMU3

Friction coefficient for point in or on polygon #1.

30:4

NXMU4

No. of points in polygon friction zone #2 (48 max).

30:5

XMU4

Friction Coefficient for Point in or on Polygon #2

This card is followed by card(s) 31 & 32.  Cards 31 & 32 are for specification of the X - Y  coordinates of the polygon friction zone.

30:9

Units

If =1.0, input units on cards 31 & 32 are in feet 

(Note: For Metric input units, this option is ignored)