Although many studies exist concerning the influence of seat vibration on the head in the seated human body, the dynamic response of the head-neck complex (HNC) to the trunk vibration has not been well investigated. Little quantitative knowledge exists about viscoelastic parameters of the neck. In this study, the dynamics of the HNC is identified when it is exposed to the trunk horizontal (fore-and-aft) vibration. The frequency response functions between the HNC angular velocity and the trunk horizontal acceleration, corresponding to four volunteers, are obtained in the frequency range of 0.5 Hz to 10 Hz. A fourth-order mathematical model, derived by considering a double-inverted-pendulum model for the HNC, is designed to simulate the dynamic response of the HNC to the trunk horizontal vibration. The frequency domain identification method is used to determine the coefficients of the mathematical model of the HNC. Good agreement has been obtained between experimental and simulation results. This indicates that the system, similar to the designed fourth-order model, has mainly two resonance frequencies. The viscoelastic parameters of the neck, including the spring and damping coefficients, are then obtained by use of the optimization method.
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e-mail: fard@control.is.tohoku.ac.jp
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August 2003
Technical Papers
Dynamics of the Head-Neck Complex in Response to the Trunk Horizontal Vibration: Modeling and Identification
Mohammad A. Fard,
e-mail: fard@control.is.tohoku.ac.jp
Mohammad A. Fard
Graduate School of Information Sciences, Tohoku University, Aobayama 01, Aoba-ku, Sendai Miyagi, 980-8579, Japan
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Tadashi Ishihara,
Tadashi Ishihara
Graduate School of Information Sciences, Tohoku University, Aobayama 01, Aoba-ku, Sendai Miyagi, 980-8579, Japan
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Hikaru Inooka
Hikaru Inooka
Graduate School of Information Sciences, Tohoku University, Aobayama 01, Aoba-ku, Sendai Miyagi, 980-8579, Japan
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Mohammad A. Fard
Graduate School of Information Sciences, Tohoku University, Aobayama 01, Aoba-ku, Sendai Miyagi, 980-8579, Japan
e-mail: fard@control.is.tohoku.ac.jp
Tadashi Ishihara
Graduate School of Information Sciences, Tohoku University, Aobayama 01, Aoba-ku, Sendai Miyagi, 980-8579, Japan
Hikaru Inooka
Graduate School of Information Sciences, Tohoku University, Aobayama 01, Aoba-ku, Sendai Miyagi, 980-8579, Japan
Contributed by the Bioengineering Division for publication in the JOURNAL OF BIOMECHANICAL ENGINEERING. Manuscript received by the Bioengineering Division April 7, 2002; revision received February 13, 2003. Associate Editor: C. L. Vaughan.
J Biomech Eng. Aug 2003, 125(4): 533-539 (7 pages)
Published Online: August 1, 2003
Article history
Received:
April 7, 2002
Revised:
February 13, 2003
Online:
August 1, 2003
Citation
Fard, M. A., Ishihara , T., and Inooka , H. (August 1, 2003). "Dynamics of the Head-Neck Complex in Response to the Trunk Horizontal Vibration: Modeling and Identification ." ASME. J Biomech Eng. August 2003; 125(4): 533–539. https://doi.org/10.1115/1.1589777
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