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Updated: May 31, 2026
06:30
Assessment of Static Graviceptive Perception in the Roll-Plane using the Subjective Visual Vertical Paradigm
Published on: April 28, 2020
Reclined postures when changing both seat back and seat pan angles
Cyrille Grébonval1, Philippe Beillas1, Xuguang Wang1
1LBMC UMR_T9406, Univ Lyon, Université Claude Bernard Lyon 1, Univ Gustave Eiffel, Lyon, France.
Traffic Injury Prevention
|May 28, 2026
Summary
This study developed regression equations to predict body posture based on seat pan and seat back angles, crucial for automated vehicle safety and comfort evaluations.
Area of Science:
- Automotive Engineering
- Biomechanics
- Human Factors
Background:
- Developing highly automated vehicles requires precise understanding of occupant safety and comfort.
- Seat design significantly influences occupant posture and well-being.
Purpose of the Study:
- To predict body posture as a function of seat pan angle (SPA) and seat back angle (SBA).
- To provide data for safety and comfort evaluations in automated vehicles.
Main Methods:
- Collected data from 13 participants using a reconfigurable seat with varying SBA (20°-60°) and SPA (14°-40°).
- Utilized motion capture, palpated landmarks, and pressure measurements to reconstruct body postures with a personalized kinematic model.
- Applied a global optimization method for posture reconstruction.
Main Results:
- Both SBA and SPA significantly influence the orientation of body segments and relative inter-segment angles.
- Optimal pelvic and spinal postures vary even with constant seat back to seat pan angles.
Conclusions:
- Regression equations can predict body posture based on seat angles.
- Findings support positioning of postmortem human surrogates (PMHS) for physical tests and human body models (HBM) for digital simulations in automotive safety and ergonomics.
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