Citation

Somasundaram K, Humm JR, Khandelwal P, Umale S, Moorcroft D, Pintar FA. J. Biomech. Eng. 2022; ePub(ePub): ePub.

Copyright

(Copyright © 2022, American Society of Mechanical Engineers)

DOI

10.1115/1.4055511

PMID

36062977

Abstract

Increased interest in the airline industry to enhance occupant comfort and maximize seating density has prompted the design and installation of obliquely mounted seats in aircraft. Previous oblique whole-body sled tests demonstrated multiple failures, chiefly distraction-associated spinal injuries under oblique impacts. The present computational study was performed with the rationale to examine how oblique loading induces component level responses and associated injury occurrence. The age-specific human body model (HBM) was simulated for two oblique seating conditions (with / without an armrest). The boundary conditions consisted of a 16g standard aviation crash pulse, 45° seat orientation, and with restrained pelvis and lower extremities. The overall biofidelity rating for both conditions ranged from 0.5 to 0.7. The validated models were then used to investigate the influence of pulse intensity and seat orientation by varying the pulse from 16 to 8g and seat orientation from 0° to 90°. A total of 12 parametric simulations were performed. The pulse intensity simulations suggest that the HBM could tolerate 11.2g without lumbar spine failure, while the possibility of cervical spine failure reduced with the pulse magnitude <9.6g pulse. The seat orientation study demonstrated that for all seat angles the HBM predicted failure in the cervical and lumbar regions at 16g; however, the contribution of the tensile load and lateral, and flexion moments varied with respect to the change in seat angle. These preliminary outcomes are anticipated to assist in formulating safety standards and in designing countermeasures for oblique seating configurations.

Language: en