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TECHNICAL PAPERS: Joint/Whole Body

Modeling the Human Body/Seat System in a Vibration Environment

[+] Author and Article Information
Jacob Rosen

Department of Electrical Engineering, Box 352500, University of Washington, Seattle, WA 98195-2500

Mircea Arcan

Department of Biomedical Engineering, Department of Solid Mechanics, Materials and Structures, Faculty of Engineering, Tel-Aviv University, Ramat-Aviv, 69978, Tel-Aviv, Israel

J Biomech Eng 125(2), 223-231 (Apr 09, 2003) (9 pages) doi:10.1115/1.1559894 History: Received July 01, 1999; Revised August 01, 2002; Online April 09, 2003
Copyright © 2003 by ASME
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References

Corbridge,  C., and Griffin,  M. J., 1991, “Effects of Vertical Vibration on Passenger Activities: Writing and Drinking,” Ergonomics, Oct. 34(10), pp. 1313–1332.
Griffin,  M. J., and Brett,  M. W., 1997, “Effects of Fore-and-aft, Lateral and Vertical Whole-body Vibration on a Head-positioning Task,” Aviat Space Environ. Med., Dec. 68(12), pp. 1115–1122
Bovenzi,  M., and Hulshof,  C. T. J., 1998, “An Updated Review of Epidemiologic Studies on the Relationships Between Exposure to Whole-body Vibration and Low Back Pain,” J. Sound Vib., 215(4), pp. 595–611, August.
Maskin,  R., and Nash,  C. D., 1976, “On Frequency Dependent Damping Coefficients in Lumped-parameter Models of Human Beings,” J. Biomech., 9, pp. 339–342.
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Fairley,  T. E., and Griffin,  M. J., 1989, “The Apparent Mass of the Seated Human Body: Vertical Vibration,” J. Biomech., 22(2), pp. 81–94.
Fairley,  T. E., and Griffin,  M. J., 1990, “The Apparent Mass of the Seated Human Body in the For-and-aft and Lateral Directions,” J. Sound Vib., 139(2), pp. 299–306.
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Brienza,  D. M., Chung,  K.-C., Brubaker,  C. E., Wang,  J., Karg,  P. E., and Lin,  C. T., 1996, “A System for the Analysis of Seat Support Surfaces Using Surface Shape Control and Simultaneous Measurement of Applied Pressures,” IEEE Trans. Rehabil. Eng., 4(2), pp. 103–113.
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Sprigle,  S. H., Chung,  K. C., and Brubaker,  C. E., 1990, “Reduction of Sitting Pressures with Custom Contoured Cushions,” J. Rehabil. Res. Dev., 27(2), pp. 135–140.
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Figures

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Lumped parameter model of a seated human body with three separate vibration axes
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Measured contact forces at the human/stiff seat plat interface (CPD) representing as a 3-D meshed plot of the sitting area (Pins distance along the plate side is 16 mm and along the plate front/back is 12 mm)
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The lumped parameter model of the human/seat contact with a two-layer composite cushion: (a) Lumped parameter model, (b) Schematic geometry description of a typical human pelvis and soft tissue cross-section above the loaded strip (Distance between pins-12 mm). Cushion configurations-schematic representation of half cross section (C.L.-Center Line): (c) Stiff seat, (d) Flat homogeneous cushion, (e) Shaped homogeneous cushion, (f ) Flat, two-layer heterogeneous cushion (2 materials), (g) Shaped, two-layer heterogeneous cushion (2 materials), (h) Flat, two-layer heterogeneous cushion (3 materials), (i) Shaped, two-layer heterogeneous cushion (3 materials), (j) Top view of upper layer three-material cushion.
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Apparent mass modules in sitting posture-model simulation results (a) Sitting posture without a backrest (Reference posture) (b) Sitting posture with a backrest (c) Stationary footrest (d) Vibration magnitude-Z axis (e) Vibration magnitude-Y axis (f ) Vibration magnitude-X axis (g) Muscle tension
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Static contact force distribution of the loaded strip interfacing with a stiff and various configurations of flexible cushions as predicted by the model. The experimental data obtained by the C.P.D. are plotted for the stiff seat only. The error bars define the accuracy range of the experimental data.
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Dynamic vertical contact force distribution of the human pelvis (loaded strip) interacting with a stiff seat interface (a), and a composite, two-layer flexible shaped cushion (b)
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Stress-Strain diagrams of the composite cushion component - experimental data
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Comparison of the static vertical contact stress distribution at the human body/composite flat cushion interface between lumped parameter model (LPM) and Finite Element Analysis/Model (FEA).

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