General Bushing System Files
The Model Identification Tool (MotionView) is a utility in HyperGraph that you use to fit experimental data to various bushing models. The MotionView generates a General Bushing System file, .gbs file, which defines the bushing properties.
Component  Method  Description 

Stiffness  Constant Stiffness  F=K*x ; used when the bushing’s stiffness
behavior is linear. The value x is the
deformation in the direction of interest. 
Spline Stiffness  F=g(x) ; where g(x) is a
cubic spline interpolation of static force vs. displacement data
in the .gbs file. Linear extrapolation is
used when the data is outside the range of specified
data. 

Cubic Stiffness  F=h(x) ; where h(x) is
defined by a pair of cubic polynomials whose coefficients are
derived from the measured force vs. displacement data in the
.gbs file. 

Damping  Constant Damping  F=c*v ; used when the bushing’s damping
behavior is linear. The value v is the
deformation velocity in the direction of interest. 
Rubber Damping  An amplitude and frequencydependent bushing model, whose coefficients are fit to measured data using a tool such as the MotionView.  
Hydromount Damping  An amplitude and frequency dependent model for hydrodynamic mounts, whose coefficients are fit to measured data using a tool such as the MotionView. 