Methodology for estimating thoracic impact response in frontal crash tests.

Area of Science:

• Biomechanics
• Crash Safety Engineering
• Occupant Protection

Background:

• Estimating occupant chest acceleration is crucial for understanding injury risk in frontal crashes.
• Current methods may not accurately capture early crash dynamics before full airbag inflation.

Purpose of the Study:

• To assess the feasibility of estimating chest acceleration using pelvic acceleration and shoulder belt forces.
• To evaluate a simplified one-dimensional occupant model for predicting chest acceleration.

Main Methods:

• Utilized a two-mass, one-dimensional model of a vehicle occupant.
• Applied pelvic acceleration and shoulder belt forces as inputs to the model.
• Validated the model against 56 full frontal barrier crash tests using Hybrid-III dummies.

Main Results:

• The model provided a reasonable estimation of chest acceleration early in the crash event.
• The combined forces from the pelvis and shoulder belts were key predictors before significant airbag loading.
• Model predictions showed good correlation with measured chest acceleration in tested scenarios.

Conclusions:

• Estimating chest acceleration from pelvic and shoulder belt data is feasible for early crash phases.
• The simplified occupant model demonstrates potential for real-time injury assessment.
• This approach may enhance understanding of occupant kinematics and injury mechanisms in frontal impacts.