The influence of reclined seating positions on lumbar spine kinematics and loading in frontal impact scenarios

Draper, Dustin<sup>1,2</sup>; Huf, Andreas<sup>1</sup>; Wernicke, Philipp<sup>1</sup>; Peldschus, Steffen<sup>2</sup>

With the advent of alternative seating positions in Highly Automated Vehicles, vehicle manufactures must take care to ensure the safety of new seating positions. The use of Human Body Models (HBMs) can aid in the use of analyzing these new concepts, as they closely represent a human being. HBMs are constructed with Finite Element (FE) modelled bones, muscles, and organs; whereas crash test dummies are made of foams, rubbers, and metallic structures. Due to these differences. HBMs show a different response compared to traditional crash test dummies. A sensitivity study on spinal posture using the THUMS v5 was performed using a BMW prototype reclined concept seat. By changing the initial of the posture of the lumbar spine, changes in spinal kinematics as well as varying force responses were observed during a frontal load case. This type of study could not be conducted with a crash test dummy as the spine of standard front crash dummies does not easily allow for postural changes. These variations suggest that initial spinal posture plays a role in the overall spinal kinematic response as well as the amount of force seen transmitted through the spine.

Year

Entry

2017

Newell N, Carpanen D, Christou A, Grigoriadis G, Little JP, Masouros SD. Strain rate dependence of internal pressure and external bulge in human intervertebral discs during axial compression. In: Proceedings of the 2017 International IRCOBI Conference on the Biomechanics of Injury. September 13-15, 2017; Antwerp, Belgium.670-671.

2017

Jorlöv S, Bohman K, Larsson A. Seating positions and activities in highly automated cars: a qualitative study of future automated driving scenarios. In: Proceedings of the 2017 International IRCOBI Conference on the Biomechanics of Injury. September 13-15, 2017; Antwerp, Belgium.13-22.

2009

Sherwood CP, Nolan JM, Zuby DS. Characteristics of small overlap crashes. In: Proceedings of the 21st International Technical Conference on the Enhanced Safety of Vehicles (ESV). June 15-18, 2009; Stuttgart, Germany.

1977

Foster JK, Kortge JO, Wolanin MJ. Hybrid III: a biomechanically-based crash test dummy. In: Proceedings of the 21st Stapp Car Crash Conference. October 19-21, 1977; New Orleans, LA. Warrendale, PA: Society of Automotive Engineers:975-1014. SAE 770938.

2018

Izumiyama T, Nishida N, Iwanaga H, Chen X, Ohgi J, Mori K, Hayashi T, Sakuramoto I, Asahi R, Sugimoto S, Ueno M. The analysis of an individual difference in human skeletal alignment in seated posture and occupant behavior using HBMs. In: Proceedings of the 2018 International IRCOBI Conference on the Biomechanics of Injury. September 12-14, 2018; Athens, Greece.549-560.