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328 Multibody Systems Approach to Vehicle Dynamics
Fig. 6.2 A detailed multibody systems vehicle model (provided courtesy of
MSC.Software)
Z 2
X 2
G 2 , O 2
Body 2
Y 2
Fig. 6.3
Vehicle body reference frame
The penalty for this approach will be the addition of 6 degrees of freedom
for each mass treated in this way. Alternatively a fix joint may be used to
rigidly attach the mass to the vehicle body. Although this would not add
degrees of freedom, the model would be less efficient through the introduction
of additional equations representing the extra body and the fix joint
constraint. The use of fix joint constraints may also introduce high reaction
moments that would not exist in the model when using elastic mounts distributed
about the mass.