UTV(ATV) Tire Pacejka "Magic" Coefficients
UTV(ATV) Tire Pacejka "Magic" Coefficients
(OP)
Hi All,
We usually work with on-road vehicles, but have to do some work with a side/side type utility vehicle. Tires are 27*9-12 and 27*11-12 ITP 900 XCT. Initially analysis is on asphalt. (I have seen the papers regarding studies on dirt)
Our current work is largely comparative rather than absolute, so the time expense of getting a tire characterized is not justified.
We have the coefficients for a 235/70/R16 Truck tire as follows :
a0 = 1.52
a1 = -23.28
a2 = -1048
a3 = -1683
a4 = -8.16
a5 = -6.76E-04
a6 = -0.0445
a7 = 0.0125
a8 = 0
a9 = 0
a10 = -0.0383
a11 = 0
a12 = 0
a13 = 0.4072
a14 = -0.00464
a15 = -1.71E-04
a16 = -0.0854
a17 = -4.70E-05
First Q - can anyone help with better Coef for the UTV type of tire ?
If not, we were thinking to scale the lat load/slip slope factor using 0.6, expecting that the tire will be more compliant than the tire we have the coef for. Are there any better ideas ? Is 0.6 considered a reasonable estimate ?
Thanks.
We usually work with on-road vehicles, but have to do some work with a side/side type utility vehicle. Tires are 27*9-12 and 27*11-12 ITP 900 XCT. Initially analysis is on asphalt. (I have seen the papers regarding studies on dirt)
Our current work is largely comparative rather than absolute, so the time expense of getting a tire characterized is not justified.
We have the coefficients for a 235/70/R16 Truck tire as follows :
a0 = 1.52
a1 = -23.28
a2 = -1048
a3 = -1683
a4 = -8.16
a5 = -6.76E-04
a6 = -0.0445
a7 = 0.0125
a8 = 0
a9 = 0
a10 = -0.0383
a11 = 0
a12 = 0
a13 = 0.4072
a14 = -0.00464
a15 = -1.71E-04
a16 = -0.0854
a17 = -4.70E-05
First Q - can anyone help with better Coef for the UTV type of tire ?
If not, we were thinking to scale the lat load/slip slope factor using 0.6, expecting that the tire will be more compliant than the tire we have the coef for. Are there any better ideas ? Is 0.6 considered a reasonable estimate ?
Thanks.





RE: UTV(ATV) Tire Pacejka "Magic" Coefficients
Drive on a 30m circle on asphalt with new tire. note swa vs speed
drive on a 30m circle on gravel with new tire note swa vs speed
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: UTV(ATV) Tire Pacejka "Magic" Coefficients
Of course asphalt also varies but I imagine it's a lot easier to control and specify
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers &
http://eng-tips.com/market.cfm
for site rules
RE: UTV(ATV) Tire Pacejka "Magic" Coefficients
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: UTV(ATV) Tire Pacejka "Magic" Coefficients