Leaf springs are essential elements in the suspension systems of
vehicles including sport utility vehicles(SUV), trucks, and
railroad vehicles. Accurate modeling of the leaf springs is
essential in evaluating ride comfort, braking, NVH, and stability.
The floating frame of reference formulation is employed to
accurately model the leaf springs nonlinearities. Vehicle rollover
may result from severe braking during lane changes, cornering, and
maneuvering. The braking-induced-steering can lead to rollover
instability. In this study, the dynamics of a detailed SUV model is
investigated by using the model in a parametric study to examine
the effect of various design configurations. To study the dynamics
of very flexible leaf springs, the absolute nodal coordinate
formulation (ANCF) is used. A shear-deformable beam element is
developed to analyze large rotation and large deformation problems.
Using the ANCF, nonlinear strain-displacement relationships are
used to define the elastic forces. The beam mass matrix remains
constant while the centrifugal and Coriolis forces are zero. The
new ANCF beam wa used to analyze very flexible leaf springs in this
investigation.
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