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Neck Validation of Multibody Human Model under Frontal and Lateral Impacts using an Optimization Technique
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 14, 2015 by SAE International in United States
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Multibody human models are widely used to investigate responses of human during an automotive crash. This study aimed to validate a commercially available multibody human body model against response corridors from volunteer tests conducted by Naval BioDynamics Laboratory (NBDL). The neck model consisted of seven vertebral bodies, and two adjacent bodies were connected by three orthogonal linear springs and dampers and three orthogonal rotational springs and dampers. The stiffness and damping characteristics were scaled up or down to improve the biofidelity of the neck model against NBDL volunteer test data because those characteristics were encrypted due to confidentiality. First, sensitivity analysis was performed to find influential scaling factors among the entire set using a design of experiment. Second, the identified scaling factors were adjusted using a gradient-based optimization technique to minimize a Biofidelity rank score (smaller the better), which is one of common technique for correlation analysis between PMHS responses and ones of a dummy or a model. In the sensitivity analysis 4 scaling factors out of 7 were found to be influential to the response of the neck model. The Biofidelity rank score was reduced from 1.63 to 0.90 through the optimization. The validated neck model showed more biofidelic responses in terms of resultant head acceleration, head rotation angle, and head relative displacement with respect to T1. The improved neck model through this study will provide more accurate head kinematics than the initial model during a vehicle-pedestrian collision, and the more accurate head kinematics will be enable more accurate prediction of the head injury risk, especially in the application of pedestrian collisions. Lastly, the methodology of this study can be applied to any other body region of a multibody model to improve its biofidelity.
CitationWang, Y., Kim, T., Li, Y., and Crandall, J., "Neck Validation of Multibody Human Model under Frontal and Lateral Impacts using an Optimization Technique," SAE Technical Paper 2015-01-1469, 2015, https://doi.org/10.4271/2015-01-1469.
- Otte D., Tobias H., “Relevance On Injury Causation Of Vehicle Parts In Car To Pedestrian Impacts In Different Accident Configurations Of The Traffic Scenario And Aspects Of Accident Avoidance And Injury Prevention,” Proceedings Of The 20th ESV Conference, Paper No.07-0176, 2007.
- TNO, “Madymo V7.5 Utilities Manual,” TNO Automotive, Delft, The Netherlands, 2013.
- Ewing, C., Thomas, D., Beeler, G., Patrick, L. et al., “Dynamic Response of the Head and Neck of the Living Human to -Gx Impact Acceleration,” SAE Technical Paper 680792, 1968, doi:10.4271/680792.
- Ewing, C.L., Thomas, D.J. et al., “Living Human Dynamic Response to -Gx Impact Acceleration, Part II - Accelerations Measured on the Head and Neck,” Thirteenth Stapp Car CrashConference.1969.
- Ewing, C. and Thomas, D., “Torque versus Angular Displacement Response of Human Head to -Gx Impact Acceleration,” SAE Technical Paper 730976, 1973, doi:10.4271/730976.
- Ewing, C., Thomas, D., Lustick, L., Becker, E. et al., “The Effect of the Initial Position of the Head and Neck on the Dynamic Response of the Human Head and Neck to -Gx Impact Acceleration,” SAE Technical Paper 751157, 1975, doi:10.4271/751157.
- Ewing, C., Thomas, D., Lustick, L., Muzzy, W. et al., “The Effect of Duration, Rate of Onset, and Peak Sled Acceleration on the Dynamic Response of the Human Head and Neck,” SAE Technical Paper 760800, 1976, doi:10.4271/760800.
- Ewing, C., Thomas, D., Majewski, P., Black, R. et al., “Measurement of Head, T1, and Pelvic Response to -Gx Impact Acceleration,” SAE Technical Paper 770927, 1977, doi:10.4271/770927.
- Wismans, J. and Spenny, C., “Performance Requirements for Mechanical Necks in Lateral Flexion,” SAE Technical Paper 831613, 1983, doi:10.4271/831613.
- Wismans, J. and Spenny, C., “Head-Neck Response in Frontal Flexion,” SAE Technical Paper 841666, 1984, doi:10.4271/841666.
- Wismans, J., Philippens, M., van Oorschot, E., Kallieris, D. et al., “Comparison of Human Volunteer and Cadaver Head-Neck Response in Frontal Flexion,” SAE Technical Paper 872194, 1987, doi:10.4271/872194.
- General Engineering and System Analysis Company, Inc., “Biomechanical Response Requirements of the Thor NHTSA Advanced Frontal Dummy,” Trauma Assessment Devise Development Program, Report No: GESEC-05-03, 2005.
- Thunnissen, J., Wismans, J., Ewing, C., and Thomas, D., “Human Volunteer Head-Neck Response in Frontal Flexion: A New Analysis,” SAE Technical Paper 952721, 1995, doi:10.4271/952721.
- Rhule, H.R., Maltese, M.R., et al., “Development of a New Biofidelity Ranking System for Anthropomorphic Test Devices,” Stapp Car Crash Journal, Vol.46 (November 2002).pp. 477-512, 2002.
- Li, Y., Hu, C., “Experiment Design and Data Processing,” Chemistry Industry Press, Beijing, Jul., 2008.