test bench

FEMFAT LAB model improvement

Features Overview:

  • MBS-model parameters will be improved based on RLD (measured channels at the structure, e.g. accelerations, relative displacements or forces)
  • Excitation is well known (measured or computed by VI) and fixed during investigations
  • Parameters must be defined and will be updated 
  • A diagnose tool assists to identify the relevant parameter

Usual dynamic simulation process


Virtual iteration


Model improvement



Diagnose - identify relevant parameters

e.g. based on relative damage values of simulated signals compared to measured signal, high deviation from value one means high influence


MBS-model parameters which can be automatically improved:

  • Mass, center of gravity
  • Mass moment of inertia
    • IX or IY or IZ 
    • Common factor on IX, IY and IZ
  • SFORCE
    • Stiffness by value or spline (linear factor), translational (e.g. coil spring) or rotational (e.g. stabilizer)
    • Damping by value or spline (linear factor), translational or rotational
  • VFORCE, GFORCE, FIELD (bushing)
    • Stiffness by value or spline (linear factor), common factor for all directions or directions separately
    • Damping by value, common factor for all directions or directions separately