Neck Injury Criteria Development for Use in System Level Ejection Testing; Characterization of ATD to Human Response Correlation under Gy Accelerative Input
Abstract
Increased neck injury risk during ejection due to the increasing mass of modern Helmet Mounted Displays (HMDs) drove Parr et al. (2013, 2014, 2015) to define new neck injury criteria to reduce subjective interpretation of ejection system test results and provide early input to HMD and escape system design. The latest revision of MIL-HDBK-516 includes Multi-Axis Neck Injury Criteria (MANIC) interpretation, as described by Parr et al., to guide HMD and escape system evaluation. This research developed a MANIC(Gy) transfer function to make MIL-HDBK-516 criteria applicable to cost effective Anthropometric Test Device (ATD) escape system testing in the Gy acceleration axis. Statistical analysis of the six primary neck loads for ATDs revealed Mx (side bending) significance, necessitated adjustment to the human MANIC(Gy) calculation developed by Parr et al. before applying it to ATDs. Linear regression produced models of ATD and human MANIC(Gy) to quantify response differences across the applicable Gy acceleration range. Resulting deltas between liner regression models defined the transfer function between ATD and human responses. Parametric survival analysis of transformed ATD MANIC(Gy) responses produced ATD injury risk curves, indicating 5 of AIS 2 injury during Gy accelerations correspond to a MANIC(Gy) of 0.473 for humans and 0.423 for ATDs.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 2017
- Accession Number
- AD1055252
Entities
People
- Stephen Ii J. Satava
Organizations
- Air Force Institute of Technology