Accession Number:

ADA459991

Title:

Mass Properties and Inertial Loading Effects of Head Encumbering Devices

Descriptive Note:

Conference paper

Corporate Author:

SYSTEMS RESEARCH LABS INC DAYTON OH

Report Date:

1986-12-01

Pagination or Media Count:

8.0

Abstract:

The purpose of this investigation is to provide data relevant to the analytical and experimental assessment of the severity of head-neck system loading induced by the protective and performance enhancing equipment worn by todays aviator. Mass properties of various head encumbering devices e.g., helmets, gas masks, night vision goggles, etc. have been measured using the automated mass properties measurement system of the U.S. Air Force Armstrong Aerospace Medical Research Laboratory AAMRL. By using a Hybrid III anthropomorphic manikin head, results were expressed within a standard head anatomical coordinate system. Dynamic tests were conducted on the Air Force 6-inch HYGE vertical impact facility. The repeatable half-sine carriage acceleration for the tests was a profile of 20 G peak acceleration and 50 millisecond duration. Head encumbering devices were mounted onto the Hybrid III manikin head-neck assembly to evaluate inertial loading effects. The procedure for measuring the mass properties is presented along with locations of encumbrance centers of gravity, and principal moments and directions defined within a head anatomical coordinate system for eight different ensembles. HYGE test results of both unencumbered and eight encumbered configurations are also presented. Comparisons are made between two specific fighter gear and chemical defense configurations.

Subject Categories:

  • Stress Physiology
  • Protective Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE