This report discusses the technical support tasks that UMTRI provided for the study by Conrad Technologies, Inc. (CTI), which was conducted for the U.S. Army Air Research Laboratory. The overall goal of the CTI study is to design three manikin headforms--small, midsized, and large--for use in military ejection seat and crashworthiness testing, as well as retention and fit assessment, of helmet and head-supported devices. The headforms will be applicable to military male and female aviator populations. UMTRI conducted a literature search and review to help establish the most appropriate design specifications for headform characteristics and properties. The U.S. Army Anthropometric Survey (ANSUR) database was selected from the literature review as the most suitable existing database for use in design of headforms. It includes data for 1,774 men and 2,208 women. An ANSUR data subset, obtained from the U.S. Army Natick Research, Development and Engineering Center, includes, for each subject, 16 head and face traditional anthropometric variables and the (X, Y, Z) coordinates of 26 head and face landmarks. One major task of CTI's design effort was to establish the three-dimensional surface geometry of the face and head for headforms. The literature review identified candidate anthropometric modeling methods for this need. CTI developed a clustering method based on four head and face variables as independent variables and three subpopulations from which median values define 5th-, 50th-, and 95th-percentile surface geometries. Other head properties for which headform design specifications are required include head mass, head principal moments of inertia, and friction and force-deflection properties of the headform surface. Information relevant to these properties is discussed, as well as scaling of basic properties from midsized to small and large heads. Both cadaver data and Hybrid III crash dummy headform data are reviewed. Except for surface geometry and orientation of principal axes of inertia, it is recommended that the headform specifications be the same as for the Hybrid III headform (50th-percentile and scaled for small and large).

  • Supplemental Notes:
    • Direct Sponsor: Conrad Technologies, Inc., Station Square One, Suite 102, Paoli, Pennsylvania 19301. Prime Sponsor: U.S. Army Air Research Laboratory (USAARL), U.S. Army Medical Research and Development Command (USAMRDC).
  • Corporate Authors:

    University of Michigan Transportation Research Institute

    2901 Baxter Road
    Ann Arbor, MI  United States  48109-2150
  • Authors:
    • Bowman, B M
  • Publication Date: 1994-10-17


  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 74 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00719358
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: UMTRI-94-31, HS-041 874
  • Files: HSL, TRIS, USDOT
  • Created Date: Mar 4 1996 12:00AM