Analysis of Driving–Point Mechanical Impedance of the Human Hand Arm System (original) (raw)

In this study, the Authors propose the discussion of nonlinearity of the human body's dynamic response. The variables that affect nonlinearity of the human body's dynamic response in the experimental measurements can be distinguished in two categories: intrinsic variables, relating to the individual subjects; and extrinsic variables, relating to the experimental conditions. International Standard 5982 : 2002 gives idealized values for the apparent mass and the seat-to-head transmissibility of seated people exposed to vertical vibration. The values are intended for the development of mechanical models to represent the body. Many mathematical models of the vertical apparent mass of the seated human body are developed. Single and two-degree-of-freedom models obtain a good agreement with experimental seat transmissibility by nonlinear least squares method and Trust-Region algorithm. The comparison between single and two-degree-offreedom models by goodness-of-fit statistics suggests that two-degree-of-freedom model is recommended for best results. . Effects of posture and vibration magnitude on apparent mass and pelvis rotation during exposure to whole-body vertical vibration. Journal of Sound and Vibration, 253 :93-107, 2002. N.J Mansfield and S. Maeda. Comparison of the apparent mass of the seated human measured using random and sinusoidal vibration. Industrial Health, 43:233-240, 2005. Y. Matsumoto and M. J. Griffin. Effect of muscle tension on non-linearities in the apparent masses of seated subjects exposed to vertical to vertical whole-body vibration. Journal of Sound and Vibration, 253:77-92, 2002. Y. Matsumoto and M.J. Griffin. Movement of the upper-body of seated subjects exposed to vertical whole-body vibration at the principal resonance frequency. Journal of Sound and Vibration, 215(4):743-762, 1998. H. Mertens. Nonlinear behavior of sitting human under increasing gravity. Aviation, Space, and Environmental Medicine, 49:287-298, 1978. N. Nawayseh and M.J. Griffin. Non-linear dual-axis biodynamic response to vertical whole-body vibration. Journal of Sound and Vibration, 268:503-523, 2003. N. Nawayseh and M.J. Griffin. Non-linear dual-axis biodynamic response to fore-and-aft wholebody vibration. Journal of Sound and Vibration, 282:831-862, 2005. N. Nawayseh and M.J. Griffin. A model of the vertical apparent mass and the fore-and-aft crossaxis apparent mass of the human body during vertical whole-body vibration. of two dynamic manikins for laboratory testing of seats under whole-body vibration. International Journal of Industrial Ergonomics, 38:457-470, 2008. G.S. Paddan and M.J. Griffin. The transmission of translational seat vibration to the head-i. vertical seat vibration. Journal of Biomechanics, 21(3):191-197, 1988. G.S. Paddan and M.J. Griffin. A review of the transmission of translational seat vibration to the head. Journal of Sound and Vibration, 215(4):863-882, 1998. G.S. Paddan and M.J. Griffin. Evaluation of whole-body vibration in vehicles. Journal of Sound and Vibration, 253(1):195-213, 2002. M.K. Patil and M.S. Palanichamy. A mathematical model of tractor-occupant system with a new seat suspension for minimization of vibration response. Applied Mathematical Modelling, 12(1): 63-71, 1988. Yi Qiu and M.J. Griffin. Modelling the fore-and-aft apparent mass of the human body and the transmissibility of seat backrests. Vehicle System Dynamics, 49(5):703-722, 2011.