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Comparison of Q3s Anthropomorphic Test Device Biomechanical Responses to Pediatric Volunteers

Ita, Meagan Eleanor
http://rave.ohiolink.edu/etdc/view?acc_num=osu1397486884

Abstract Details

2014, Master of Science, Ohio State University, Biomedical Engineering.
The biofidelity of pediatric ATDs continues to be evaluated with scaled-down adult data, a methodology that makes inaccurate assumptions about the likeness of biomechanical properties of children and adults. Recently, evaluation of pediatric ATDs by comparison of pediatric volunteer (PV) data has been shown to be a valuable and practical alternative to the use of scaled adult data. This study utilized existing PV data to evaluate a 3 year-old side impact ATD, the Q3s. While ATDs have been compared to volunteer responses in frontal impacts, this study is the first to extend ATD-PV comparison methods to the Q3s ATD, and among the first to extend these methods to side impacts. Previously conducted experiments were replicated in order to make a direct comparison between the Q3s and PVs. PV data were used from 4-7 year-olds (shoulder tests, n=14) and 6-8 year-olds (sled tests, n=7). Force-deflection data were captured during quasi-static shoulder tests through manual displacement of the shoulder joint. Resulting shoulder stiffness was compared between the Q3s and PVs. Low-speed far-side sled tests were conducted with the Q3s at lateral (90 degrees) and oblique (60 degrees) impacts. Primary outcomes of interest included 1) lateral displacement of the torso, 2) torso rollout angle, and 3) kinematic trajectories of the head and neck. The Q3s exhibited shoulder stiffness values at least 32 N/mm greater than the PVs for all conditions (PV muscle tensed and relaxed, deflection calculated for full- and half-thoracic). In lateral sled tests, the Q3s demonstrated increased lateral torso displacement (Q3s: 194.6 mm; PVs: 164.3 mm ± 26.6), coronal torso rollout (Q3s: 49.2 degrees; PVs: 35.7 degrees ± 12.4), and maximum excursions in the Y and Z directions for trajectories of the top of the head, C4, and T1, compared to PVs. In oblique trials, the Q3s did not exhibit significantly different lateral torso displacement or rollout, but achieved less forward X motion (Q3s: 68 mm; PVs: 113 ± 17 mm) compared to PVs. Increased Q3s ATD shoulder stiffness suggests an effect on loads seen by the Q3s head, torso, and neck during side impact. Q3s and PV trajectories were of similar shape, although Q3s head kinematics displayed rigid body motion followed by independent lateral bending of the head, suggesting cervical and thoracic spine rigidity compared to PVs.
John Bolte, IV (Advisor)
Mark Ruegsegger (Committee Member)
Yun-Seok Kang (Committee Member)
145 p.
Biomechanics; Biomedical Engineering; Engineering
Side impact; crash dummies; child safety; biofidelity; occupant kinematics; pediatric ATD

Recommended Citations

Citations

  • Ita, M. E. (2014). Comparison of Q3s Anthropomorphic Test Device Biomechanical Responses to Pediatric Volunteers [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397486884

    APA Style (7th edition)

  • Ita, Meagan. Comparison of Q3s Anthropomorphic Test Device Biomechanical Responses to Pediatric Volunteers. 2014. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1397486884.

    MLA Style (8th edition)

  • Ita, Meagan. "Comparison of Q3s Anthropomorphic Test Device Biomechanical Responses to Pediatric Volunteers." Master's thesis, Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397486884

    Chicago Manual of Style (17th edition)

osu1397486884
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© 2014, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.