Accession Number:



Biodynamics of Anthropomorphic Test Device Necks Using a Horizontal Impulse Accelerator: Head Accelerations and Neck Loads

Descriptive Note:

[Technical Report, Interim Report]

Corporate Author:

Infocitex Corporation

Report Date:


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Research was conducted involving a series of impacts on the AFRL Horizontal Impulse Accelerator HIA, as part of a research collaboration agreement between NASA and AFRL. The purpose of the effort was to evaluate and conduct a comparison of the biodynamic response of different sized ATD head and neck configurations to support the development of computational models used to evaluate crew injury risk and aid in the design of seat and restraint systems for NASAs space vehicles and USAF air vehicles. Testing was completed using a head and neck combination from a 5th Hybrid III female aerospace ATD, a 50th Hybrid III male aerospace ATD, and a 95th Hybrid III male aerospace ATD. A test matrix was developed to assess each ATD as a function of both impact orientation, magnitude of the impact acceleration input pulse 8 to 16 G dependent on impact orientation, and rise-time or time-to-peak of the impact acceleration input pulse 50 or 100 ms. Secondary independent test variables included tests with or with-out a helmet mounted on the head, and tests with or with-out the inclusion of a contact plate that provided impact for the head or head plus helmet. The impact orientations consisted of X-axis, -X-axis, and Y-axis with the directions relative to the manikin axis reference frame on the inclined test fixture. Free motion of the ATD heads without the contact plate indicated that the head kinematics and neck loads showed a trend to increase as a function of the impact level, and a majority of the data indicated very little difference between the response of the ATD head and necks. Notable exceptions were reduced peak values for the 95th ATD relative to the head kinematics, and reduced peak values for the 5th ATD relative to the neck loads and torques . The data also indicated that the addition of a helmet or a helmet with additional padding successfully reduced kinematic response and inertial neck loads in the three different impact configurations compared to a no-helmet


Subject Categories:

  • Mechanics
  • Human Factors Engineering and Man Machine Systems
  • Test Facilities, Equipment and Methods

Distribution Statement:

[A, Approved For Public Release]