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Development of a computationally efficient full human body finite element model.

Doron Schwartz1, Berkan Guleyupoglu, Bharath Koya

  • 1a Wake Forest University School of Medicine , Winston-Salem , North Carolina.

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Summary

A simplified human body finite element model (M50-OS) offers a computationally efficient alternative to the detailed M50-O model. This new model significantly reduces simulation run times while maintaining comparable kinematic and kinetic data for biomechanical research.

Keywords:
GHBMCbiomechanicsfinite elementhuman bodyvalidation

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Area of Science:

  • Biomechanics
  • Computational modeling
  • Human body simulation

Background:

  • The Global Human Body Models Consortium (GHBMC) developed a detailed 50th percentile occupant (M50-O) finite element model.
  • A need exists for computationally efficient human body models that complement detailed models for broader research applications.

Purpose of the Study:

  • To develop and validate a simplified human body finite element model (M50-OS) with reduced computational cost.
  • To ensure the simplified model retains comparable kinematic and kinetic data to the detailed M50-O model.
  • To assess the M50-OS model's utility for parametric studies and specific body region analyses.

Main Methods:

  • Developed the M50-OS model using the same geometry as the M50-O, reducing element count through remeshing, homogenization, and omission of structures.
  • Included bones as rigid bodies, with deformable ribs at a coarser element density.
  • Implemented kinematic joints at major articulations and incorporated literature-derived moment-angle relationships for knee and ankle.
  • Inserted the detailed model's brain into the simplified model for comparative analysis.

Main Results:

  • The M50-OS model has significantly fewer elements (354,000) and contacts (11) compared to the M50-O (2.2 million elements, 447 contacts).
  • Validation simulations including rib compression, rigid body impacts, and sled tests showed good agreement with experimental data for force, deflection, and kinematic trends.
  • The M50-OS model demonstrated a 4.75x faster run time than the M50-O, with an average 35-fold reduction in run time for rigid impacts.

Conclusions:

  • The simplified M50-OS model effectively complements the detailed M50-O model by offering substantial computational efficiency.
  • The M50-OS model can be utilized modularly with the M50-O or as a standalone platform for various biomechanical studies.
  • This simplified model facilitates broader parametric studies and focused investigations on specific human body regions.