Transactions of the Korean Society for Noise and Vibration Engineering (한국소음진동공학회논문집)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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Study of Apparent Mass and Apparent Eccentric Mass to Vertical Whole-body Vibration by Using Strain-gage Type Six-axis Force Plate

6축 힘측정판을 이용한 수직방향 전신진동에 대한 겉보기질량 및 겉보기편심질량에 대한 고찰

  • 전경진 (부산대학교 대학원 기계공학부) ;
  • 김민석 (현대중공업 제품개발연구소 건설장비연구실) ;
  • 안세진 (르노삼성자동차 품질해석팀) ;
  • 정의봉 (부산대학교 기계공학부) ;
  • 유완석 (부산대학교 기계공학부)
  • Received : 2011.06.07
  • Accepted : 2011.09.19
  • Published : 2011.10.20
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Abstract

When whole-body is exposed to vertical vibration, asymmetry shape of human body affects the response on the translational(fore-aft, lateral, vertical) and rotational(roll, pitch, yaw) motion. While the translational motion has been studied with various titles, it has been rare to study the rotational motion of human body exposed to vertical excitation because of lack of experimental equipment. This study was performed by using a 6-axis force plate installing strain gage type sensors for the rotational response. Sixteen male subjects were exposed to vertical vibration on rigid seat in order to investigate apparent mass of three translational motion and apparent eccentric mass of three rotational motion. Random signal was generated to make excitation vibration which was on an effective frequency range of 3~40 Hz, and magnitude of 0.224 m/$s^2$ r.m.s. The frequency range and magnitude used was selected for the vibration of passenger vehicle on idling condition. As the result, cross-axis apparent masses of fore-and-aft and lateral direction were not significant showing 20 % and 3 % of vertical apparent mass relatively. And apparent eccentric mass of pitch motion was dominant when compared to that of roll and yaw motion, which is reasoned by asymmetry direction of human body sitting on a seat.

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References

  1. Griffin, M. J., 1990, Handbook of Human Vibration, Elsevier Academic Press, London.
  2. ISO 5982, 2001, Mechanical Vibration and Shock - Range of Idealized Values to Characterize Seated-body Biodynamic Response under Vertical Vibration, International Organization for Standardization, Geneva.
  3. Mansfield, N. J. and Griffin, M. J., 2000, Non-linearities in Apparent Mass and Transmissibility During Exposure to Whole-body Vertical Vibration, Journal of Biomechanics, Vol. 33, Issue 8, pp. 933-941. https://doi.org/10.1016/S0021-9290(00)00052-X
  4. Rakheja, S., Stiharu, I. and Boileau, P. E., 2002, Seated Occupant Apparent Mass Characteristics under Automotive Postures and Vertical Vibration, Journal of Sound and Vibration, Vol. 253, Issue 1, pp. 57-75. https://doi.org/10.1006/jsvi.2001.4249
  5. Cheung, W. S., Kim, Y. T., Kwon, H. S. and Hong, D. P., 2003, Experimental Investigation of the Response Characteristics of Korean - Seated Subjects under Vertical Vibration: (I) Apparent Mass,Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 13, No. 8, pp. 645-650. https://doi.org/10.5050/KSNVN.2003.13.8.645
  6. Cheung, W. S., Kim, Y. T., Kwon, H. S. and Hong, D. P., 2003, Experimental Investigation of the Response Characteristics of Korean - Seated Subjects under Vertical Vibration: (II) Mechanical Impedance, Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 13, No. 9, pp. 713-719. https://doi.org/10.5050/KSNVN.2003.13.9.713
  7. Kitazaki, S. and Griffin, M. J., 1997, A Model Analysis of Whole-body Vertical Vibration, Using a Finite Element Model of the Human Body, Journal of Sound and Vibration, Vol. 200, Issue 1, pp. 83-103. https://doi.org/10.1006/jsvi.1996.0674
  8. Nawayseh, N. and Griffin, M. J., 2003, Non-linear Dual-axis Biodynamic Response to Vertical Whole-body Vibration, Journal of Sound and Vibration, Vol. 268, Issue 3, pp. 503-523. https://doi.org/10.1016/S0022-460X(03)00254-2
  9. Nawayseh, N. and Griffin, M. J., 2009, A Model of the Vertical Apparent Mass and the Fore-and-aft Cross-axis Apparent Mass of the Human Body During Vertical Whole-body Vibration, Journal of Sound and Vibration, Vol. 319, Issue 1-2, pp. 719-730. https://doi.org/10.1016/j.jsv.2008.05.030
  10. Mansfield, N. J. and Maeda, S., 2006, Comparison of the Apparent Masses and Cross-axis Apparent Masses of Seated Humans Exposed to Single- and Dual-axis Whole-body Vibration, Journal of Sound and Vibration, Vol. 298, Issue 3, pp. 841-853. https://doi.org/10.1016/j.jsv.2006.06.017
  11. Rakheja, S., Dong, R. G., Parra, S., Boileau, P. E., Marcotte, P. and Warren, C., 2010, Biodynamics of the Human Body under Whole-body Vibration: Synthesis of the Reported Data, International Journal of Industrial Ergonomics, Vol. 40, Issue 6, pp. 710-732. https://doi.org/10.1016/j.ergon.2010.06.005
  12. Matsumoto, Y. and Griffin, M. J., 2001, Modelling the Dynamic Mechanisms Associated with the Principal Resonance of the Seated Human Body, Clinical Biomechanics, Vol. 16 Supplement, No. 1, pp. S31-S44. https://doi.org/10.1016/S0268-0033(00)00099-1
  13. Jeon, G. J., Kim, M. S., Ahn, S. J., Jeong, W. B. and Yoo, W. S., 2010, Human Response to Idle Vibration of Passenger Vehicle Related to Seating Posture, Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 20, No. 12, pp. 1121-1127. https://doi.org/10.5050/KSNVE.2010.20.10.1121
  14. Carignan, F. J. and Cook N. H., 1982, Force Measuring Platform and Load Cell There for Using Strain Gages to Measure Shear Forces, U.S. Patent, No. 4,493,220.
  15. Carignan, F. J. and Cook N. H., 1983, Force Platform Construction and Method of Operating Same, U.S. Patent, No. 4,498,429.
  16. ISO 2631-1, 1997, Mechanical Vibration and Shock - Evaluation of Human Exposure to Whole-body Vibration - Part 1: General Requirements, International Organization for Standardization, Geneva.
  17. Howitt, D. and Cramer, D., 2005, Introduction to Statistics in Psychology, Pearson Education limited, Essex.
  18. Siegel, S. and Castellan, N. J., 1988, Nonparametric Statistics for the Behavioral Sciences, McGrawHill, NewYork.