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Method of Creation of Anti-Roll Bar

aleksandr.bokarev
Dear All,
 
I'm sorry If I duplicated topics but I couldnt find one.
I impacted with trouble about creating of Anti-Roll Bar. As far you know we can create anti-roll bat in Adams/Car by three ways:
  • simple method (torsional stiffness - for instance you could get torsional stiffness from NASTRAN and to use it in ADAMS);
  • BEAM method
  • FE method
I tried to compare results of torsional stiffness for all three method and to check by bench tests. Results for BEAM and FE methods are almost the same but results too far from test results and simple method results. Results of simple method (torsional stiffness from ANSIS) and bench tests are really close. For instance, I have evaluated torsional stiffness of anti-roll bar of 48mm diameter (solid method):
  • simple method (torsional stiffness - I calculated torsional stiffness in ANSIS (I got 602 [N*m/deg] of torsional stiffness);
  • BEAM method (this method gave me 930.8 [N*m/deg]);
  • FE method (this method gave me 930.6 [N*m/deg])
  • test results: around 580 [N*m/deg]
 
I'd like to ask why I have too much differences for FE/BEAM versus simple method (torsional stiffness from ANSIS) which confirmed by nature tests? Did somebody check of FE/BEAM methods? May be have I to increase accuracy by increasing of hardpoints when I set Bspline? But it seems it cannot reduce error too much... now 50% error is too much..
 
Now I have to use simple method of creation of ARB stiffness in ADAMS. I am really not sure when I use FE/BEAM methods. .
 
Thank you in advance.
__________________________
Best regards
Aleksandr Bokarev
 Lead Design Engineer
«Vehicle dynamic» group
 NAMI, «Modelling of Handling
and Stability» department
 
Tel.:       +7-(495)-456-65-07
Tel.mob. +7-915-184-02-46
Tel. loc.   64-02
 
 
 
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