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TECHNICAL PAPERS

Non-Linear Characteristics in the Dynamic Responses of Seated Subjects Exposed to Vertical Whole-Body Vibration

[+] Author and Article Information
Yasunao Matsumoto

Department of Civil and Environmental Engineering, Saitama University, 255 Shimo-Ohkubo, Urawa, Saitama, 338-8570, Japane-mail: ymatsu@post.saitama-u.ac.jp

Michael J. Griffin

Institute of Sound and Vibration Research, University of Southampton, Highfield, Southampton, SO17 1BJ, Englande-mail: M.J.Griffin@Soton.ac.jp

J Biomech Eng 124(5), 527-532 (Sep 30, 2002) (6 pages) doi:10.1115/1.1499959 History: Received March 01, 2000; Revised May 01, 2002; Online September 30, 2002
Copyright © 2002 by ASME
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References

Fairley,  T. E., and Griffin,  M. J., 1989, “The Apparent Mass of the Seated Human Body: Vertical Vibration,” J. Biomech., 22, pp. 81–94.
Hinz,  B., and Seidel,  H., 1987, “The Nonlinearity of the Human Body’s Dynamic Response During Sinusoidal Whole Body Vibration,” Ind. Health, 25, pp. 169–181.
Mansfield, N. J., 1998, “Non-Linear Dynamic Response of the Seated Person to Whole-Body Vibration.” Ph.D. thesis, University of Southampton, Southampton, England.
Mansfield,  N. J., and Griffin,  M. J., 2000, “Non-Linear Response of the Abdomen to Whole Body Vertical Vibration,” J. Biomech., 33, pp. 933–941.
Matsumoto,  Y., and Griffin,  M. J., 1998, “Dynamic Response of the Standing Human Body Exposed to Vertical Vibration: Influence of Posture and Vibration Magnitude,” J. Sound Vib., 212, pp. 85–107.
Broman,  H., Pope,  M. H., Bendat,  M., Svensson,  M., Ottosson,  C., and Hansson,  T., 1991, “The Impact Response of the Seated Subject,” J. Orthop. Res., 9, pp. 150–154.
Panjabi,  M. M., Anderson,  G. B. J., Jorneus,  L., Hult,  E., and Mattsson,  L., 1986, “In Vivo Measurements of Spinal Column Vibrations,” J. Bone Joint Surg. Br., 68A, pp. 695–702.
Pope,  M. H., Broman,  H., and Hansson,  T., 1989, “Impact Response of the Standing Subject—a Feasibility Study,” Clin. Biomech. (Los Angel. Calif.), 4, pp. 195–200.
Bovenzi,  M., and Hulshof,  C. T. J., 1998, “An Updated Review of Epidemiologic Studies on the Relationship Between Exposure to Whole-Body Vibration and Low Back Pain,” J. Sound Vib., 215, pp. 595–611.
Wittmann,  T. J., and Phillips,  N. S., 1969, “Human Body Nonlinearity and Mechanical Impedance Analysis,” J. Biomech., 2, pp. 281–288.
Matsumoto,  Y., and Griffin,  M. J., 1998, “Movement of the Upper-body of Seated Subjects Exposed to Vertical Whole-Body Vibration at the Principal Resonance Frequency,” J. Sound Vib., 215, pp. 743–762.
Paddan,  G. S., and Griffin,  M. J., 1988, “The Transmission of Translational Seat Vibration to the Head-I. Vertical Seat Vibration,” J. Biomech., 21, pp. 191–197.
Hinz,  B., Seidel,  H., Bräuer,  D., Menzel,  G., Blüthner,  R., and Erdmann,  U., 1988, “Bidimensional Accelerations of Lumbar Vertebrae and Estimation of Internal Spinal Load during Sinusoidal Vertical Whole-Body Vibration: a Pilot Study,” Clin. Biomech. (Los Angel. Calif.), 3, pp. 241–248.
Sandover,  J., and Dupuis,  H., 1987, “A Reanalysis of Spinal Motion during Vibration,” Ergonomics, 30, pp. 975–985.
International Organization for Standardization, 1997, “Mechanical Vibration and Shock-Evaluation of Human Exposure to Whole-Body Vibration—Part 1: General Requirements,” ISO 2631-1, International Organization for Standardization, Geneva.
Kitazaki,  S., and Griffin,  M. J., 1995, “A Data Correction Method for Surface Measurement of Vibration on the Human Body,” J. Biomech., 28, pp. 885–890.
Vogt,  H. L., Coermann,  R. R., and Fust,  H. D., 1968, “Mechanical Impedance of the Sitting Human under Sustained Acceleration,” Aerospace Med., 39, pp. 675–679.
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Kitazaki,  S., and Griffin,  M. J., 1997, “A Modal Analysis of Whole-Body Vertical Vibration, Using a Finite Element Model of the Human Body,” J. Sound Vib., 200, pp. 83–103.
Matsumoto,  Y., and Griffin,  M. J., 2001, “Modeling the Dynamic Mechanisms Associated with the Principal Resonance of the Seated Human Body,” Clin. Biomech. (Los Angel. Calif.), 16(Sup 1), pp. S31–S44.
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Figures

Grahic Jump Location
Medians for normalized apparent masses and phases of the eight subjects in a sitting posture measured at five vibration magnitudes: ⋯, the lowest magnitude, 0.125 ms−2 r.m.s.;    the greatest magnitude, 2.0 ms−2 r.m.s.
Grahic Jump Location
Median transmissibilities from vertical seat vibration to vertical vibration at each measurement location at five magnitudes of vibration: ⋯, the lowest magnitude (0.125 ms−2 r.m.s.);    the greatest magnitude (2.0 ms−2 r.m.s.)
Grahic Jump Location
Median transmissibilities from vertical seat vibration to fore-and-aft vibration at each measurement location at five magnitudes of vibration: ⋯, the lowest magnitude (0.125 ms−2 r.m.s.);    the greatest magnitude (2.0 ms−2 r.m.s.).
Grahic Jump Location
Median transmissibilities from vertical seat vibration to pitch vibration at each measurement location at five magnitudes of vibration: ⋯, the lowest magnitude (0.125 ms−2 r.m.s.);    the greatest magnitude (2.0 ms−2 r.m.s.). (The unit for the transmissibilities is [rads−2 /ms−2 ].)
Grahic Jump Location
Medians (–) and inter-quartile ranges (–) of the frequency of the peak in transmissibilities measured at five vibration magnitudes: (a) and (b), transmissibility to the vertical vibration at L3; (c) and (d), transmissibility to the pitch vibration at the head. (The unit for the peak transmissibility in the pitch axis in (d) is [rads−2 /ms−2 ].)
Grahic Jump Location
Relative motion between vertical vibration at L5 and vertical vibration at each measurement location above L5; median transmissibilities at five magnitudes of vibration: ⋯, the lowest magnitude (0.125 ms−2 r.m.s.);    the greatest magnitude (2.0 ms−2 r.m.s.).

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