4.17.3. Velocity and Normal Force Dependent Friction

frictionModel('VelNormalFrcDep', frnTag, aSlow, nSlow, aFast, nFast, alpha0, alpha1, alpha2, maxMuFact)

This command is used to construct a VelNormalFrcDep friction model object.

frnTag (int)

unique friction model tag

aSlow (float)

constant for coefficient of friction at low velocity

nSlow (float)

exponent for coefficient of friction at low velocity

aFast (float)

constant for coefficient of friction at high velocity

nFast (float)

exponent for coefficient of friction at high velocity

alpha0 (float)

constant rate parameter coefficient

alpha1 (float)

linear rate parameter coefficient

alpha2 (float)

quadratic rate parameter coefficient

maxMuFact (float)

factor for determining the maximum coefficient of friction. This value prevents the friction coefficient from exceeding an unrealistic maximum value when the normal force becomes very small. The maximum friction coefficient is determined from μFast, for example \(\mu \leq maxMuFac*μFast\).