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Analytical Study of the Interaction Between the Seat Belt and a Hybrid III D Dummy In Sled Tests
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Abstract
The Cal3D simulation program was used to study the interaction between the belt restraint systems and a Hybrid III dummy in two sled tests. The elastic properties of the dummy joints and thorax were obtained from static tests. The two belt algorithms in the Cal3D program were compared and simulation results indicated that the “harness model”, which utilizes multi-segment representation for the belt is more suitable than the “simple belt model”, which has only one fixed point on the torso. Simulating a frontal impact of a lap belt restrained dummy indicated that the dummy motion consists of two distinct phases; a forward translation followed by a rotation. During forward translation the belt is primarily in contact with the abdomen while during rotation the belt is interacting with the upper legs. For a lap and shoulder belt restrained dummy, considerable head acceleration was induced by chin/chest impact. The flexibility of the neck also has a significant effect on the magnitude of this impact. Exercising the model indicated that shoulder belt alone is not sufficient to prevent submarining and proper anchor point location is important to achieve adequate torso restraint. It was also found that a stiffer belt system would reduce head acceleration and excursion, rib deformation and chest viscous response, but induce higher spine and sternal accelerations.
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Citation
Deng, Y., "Analytical Study of the Interaction Between the Seat Belt and a Hybrid III D Dummy In Sled Tests," SAE Technical Paper 880648, 1988, https://doi.org/10.4271/880648.Also In
References
- Fleck, J. T. Butler, F. E. Validation of the Crash Victim Simulator DOT HS-806 270–282 1981
- Foster, J. K. Kortge, J. O. Wolanin, M. J. “Hybrid III - A Biomechanically-Based Crash Test Dummy” Proceedings of the 21st Stapp Car Crash Conference, SAE Paper No. 770938
- Deng, Y. -C. “Hybrid HI Dummy Neck Modeling and Some Neck Injury Considerations” GM Research Report GMR-5869 May 28 1987
- Viano, D. C Lau, I. V. “Thoracic Impact: A Viscous Tolerance Criterion” Proceedings of the Tenth Experimental Safety Vehicle Conference Oxford, England 1985
- Butler, F. E. Fleck, J. T. “Advanced Restraint System Modeling” Report No. AFAMRL-TR-80-14 May 1980