Development of a Dynamic Biomechanical Model for Load Carriage: Phase III Part C2: Development of a Dynamic Biomechanical Model Version 1 of Human Load Carriage


  1. Reid, S.A.
  2. Bryant, J.T.
  3. Stevenson, J.M.
Corporate Authors
Defence R&D Canada - Toronto, Toronto ONT (CAN);Queen's Univ, Kingston ONT (CAN) Ergonomics Research Group
The overall purpose of the DRDC research program on dynamic biomechanical modeling is to improve the understanding of human load carriage capabilities and to understand the benefits of load carriage system design features to human health and mobility. Earlier phases of the dynamic biomechanical model have lead to a new modeling approach that treats the pack-person interface as a dynamic suspension system. In the current study, both 2D and 3D dynamic modeling software packages were selected to permit multiple models of the pack person suspension characteristics. The selected software both permit full user control of model geometry, inertial properties, have extensive libraries of existing dynamic elements for modeling constraints, allow the user to construct complex constraint equations and allow the user to input complex forcing functions. For both the 2D and 3D models, two types of dynamic tests were conducted to determine the impulse response and the natural frequencies. For the 2D model, the impulse response test showed typical results for a mildly under-damped system with the amplitude ratio plot showing a modest peak at approximately 8 Hz, higher than the estimated natural frequency of 4.8 Hz. On the other hand, the impulse response test for the 3D model gave a vertical displacement typical of an over-damped system and an amplitude ratio plot with several resonant frequencies at approximately 2.5 Hz and again at 5 Hz. With the damping reduced by a factor of 100, there we

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Load carriage;Dynamic Biomechanical Model;MSC Working Model;2D Model;3D Model;Dynamic Modelling Software
Report Number
DRDC-TORONTO-CR-2005-122 — Contractor Report
Date of publication
01 Aug 2005
Number of Pages
Electronic Document(PDF)

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