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Development of a New Human Thoracic Equivalent Model during Frontal Impact
Journal Article
09-11-02-0007
ISSN: 2327-5626, e-ISSN: 2327-5634
Sector:
Topic:
Citation:
Liu, Z., Zheng, H., and Ma, W., "Development of a New Human Thoracic Equivalent Model during Frontal Impact," SAE Int. J. Trans. Safety 11(3):289-306, 2023, https://doi.org/10.4271/09-11-02-0007.
Language:
English
Abstract:
Human thoracic injury under frontal collisions is an inevitable problem in
vehicle safety research. Compared with the Multiple Rigid-Body Models (MRBMs)
and Finite Element Human Body Models (FEHBMs), Mathematical Equivalent Models
(MEMs) can not only provide important data but also improve the research
efficiency. The current thoracic MEMs usually adapted the mechanical isolation
method to isolate the thorax from the human body; therefore, the effects of the
head, neck, and lower body internal organs on the mechanical responses of the
thorax are not considered. In this article, a new thoracic MEM, named as
Improved Consistent Lobdell Model (ICLM), is developed based on the concentrated
mass-spring-damping system to consider the energy absorbed by the deformation of
the internal soft tissue and the motion hysteresis of the head, neck, and lower
body. Thorax equivalent stiffness curve predicted by the ICLM has a good fit
with the corridor obtained by the Post-Mortem Human Subjects (PMHS) experiments
under the medium-speed pendulum impact. Based on the parametric and sensitivity
analysis, the values of parameters in each subsystem of the ICLM are adjusted to
improve the accuracy of different impact tests predicted by the ICLM. The
thoracic responses predicted by the adjusted ICLM under the medium-speed
pendulum impact were basically consistent with that predicted by the Total Human
Model for Safety (THUMS). The relative errors of maximum chest force
(Fmax) and maximum chest deflection
(Dmax) between the adjusted ICLM model and
THUMS are 0.57% and 0.86%, respectively. The adjusted ICLM has good biofidelity
and can be applied in the field of automotive engineering in the future.