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Standardized Assessment of Gravity Settling Human Body Models for Virtual Testing
B Wade von Kleeck Iii1, Juliette Caffrey1, Ashley A Weaver1
1Biomedical Engineering, Wake Forest University School of Medicine.
Stapp Car Crash Journal
|September 9, 2024
Summary
Optimizing computational human model (HBM) seating involves specific gravity settling times for different postures. Reclined occupants require less settling time than upright drivers for accurate safety system evaluations.
Area of Science:
- Biomechanics
- Computational modeling
- Automotive safety engineering
Background:
- Computational human models (HBMs) are increasingly used in vehicle safety system evaluations.
- Effective coupling of HBMs to their seated environment is critical for accurate simulation results.
- Existing methods for HBM-seat interaction require further investigation for different postures.
Purpose of the Study:
- To assess the impact of gravity settling methods on HBM-seat coupling quality.
- To determine optimal gravity settling times for upright driver and reclined occupant postures.
- To evaluate the influence of settling parameters on HBM kinematics during crash simulations.
Main Methods:
- Simulated THUMS v4.0.1 in upright and reclined postures within an NCAC vehicle model.
- Varied HBM-seat contact friction and seat stiffness.
- Performed gravity settling with and without pelvic constraints, comparing 800 ms simulations to shorter, optimized times.
- Conducted crash pulse simulations to analyze settling time effects on kinematics.
Main Results:
- Optimal gravity settling times identified: 350 ms for upright driver, 290 ms for reclined occupant.
- Pelvis-constrained approach recommended for upright driver posture, not for reclined.
- Optimized settling times achieved comparable quality metrics to 800 ms settling.
- Driver kinematics varied significantly with gravity settling duration.
Conclusions:
- Posture-specific gravity settling times are crucial for accurate HBM-seat coupling.
- Reduced settling times are feasible and efficient for reclined occupants.
- Further research needed to validate findings across different HBMs and test modes.
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