Investigation of the Preferred Mass Properties for Infantry Headwear Systems

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Authors
  1. Tack, D.W.
  2. Nakaza, E.T.
  3. McKee, K.W.
  4. MacEachern, A.
  5. Marrao, C.
Corporate Authors
Defence R&D Canada - Toronto, Toronto ONT (CAN);Humansystems Inc, Guelph ONT (CAN)
Abstract
In many future soldier system designs the helmet has become the mounting platform for many different protection and information technologies. While the addition of these technologies may represent a capability enhancement to the soldier and the Section, these additions also represent an increase in the Head Mounted Load (HML) being borne by the musculo-skeletal system of the wearer. This study investigated soldier preferences and acceptance for the overall mass, centre of mass (CM) location, and Mass Moment of Inertia about the Y axis (Iyy) of four helmet masses (1.5, 2.0, 2.5, and 3.0 kg) during static and dynamic infantry tasks. Acceleration forces in the X, Y, and Z axes were also characterized in both moderate intensity, short duration tasks (obstacles course) and high intensity, long duration tasks (infantry urban assault missions). Findings from this experiment showed that the 1.5 kg, 2.0 kg and to a lesser extent the 2.5 kg weighted helmets were the most accepted conditions, while participants judged the 3.0 kg weighted helmets to be unacceptable. Other findings revealed that the preferred position of the helmet mass varied within a range of 35mm in the Y axis and 55mm in the Z axis, and the distribution was fairly symmetrical between the left and right side of the head. With increasing mass, the preferred CM location on the X axis changed very little. Generally, for the X axis, participants tended to locate the masses posterior to the head CM and just anterior to the

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Keywords
SIHS;Soldier Integrated Headwear System;helmet;Mass Moment of Inertia;centre of mass;head mounted load;head supported mass;Acceleration
Report Number
DRDC-TORONTO-CR-2005-230 — Contractor Report
Date of publication
01 Sep 2006
Number of Pages
112
DSTKIM No
CA032464
CANDIS No
531626
Format(s):
Electronic Document(PDF)

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