Definition of a Range of Idealized Values to Characterize Seated Body Biodynamic Response Under Vertical Vibration

Boileau, P.-É.; Wu, Xuting; Rakheja, S.

doi:10.1006/jsvi.1998.1674

Cited by 77 publications

(63 citation statements)

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“…To compare the own results with those of other authors summarized in review studies [1][2][3] , the medians together with the 25th and 75th quartiles of the moduli were calculated for the seat-to-head transmissibilities (Fig. 4).…”

Section: Comparison With Seat-to-head Transmissibility Curves Of Othementioning

confidence: 99%

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Seat-to-head Transfer Function of Seated Men ―Determination with Single and Three Axis Excitations at Different Magnitudes

et al. 2010

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Most research has investigated the seat-to-head transmissibility during single-axis excitations. Associations between head accelerations and discomfort or effects on vision were reported. Possible differences between the seatto-head transmissibility determined during different vibration magnitudes with a variable number of excitation axes have not been systematically examined. An experimental study was performed with 8 male subjects sitting on a rigid seat with hands on a support. They were exposed to random whole-body vibration (E1=0.45 ms -2 , E2=0.90 ms -2 , and E3=1.80 ms -2 ) to single-and three-axis vibration. All translational and rotational seat-to-head transmissibilities were calculated. The effects of the factors vibration magnitude and number of axes on the peak modulus and frequency of the seat-to-head transmissibilities were tested. In general the head motions follow constant pattern. These pattern of head motions comprise a combination of rotational and translational shares of transmissions, i.e. the curves show a dependence on the factors 'vibration magnitude' and 'number of vibration axes'. Mechanical properties of the soft tissue, relative motions of body parts, and muscle reactions were supposed to cause the nonlinearities of the head. Future research should consider effects of multi-axis vibration, if conclusions shall be drawn for the evaluation of possible health effects and model validations.

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Section: Comparison With Seat-to-head Transmissibility Curves Of Othementioning

confidence: 99%

“…The influences of the described factors were studied by numerous authors at the end of last century and were summarized in two review papers 1,2) . Boileau and Rakheja 1) identified 10 data sets which satisfied the imposed selection rules to derive idealized values of the seat-to-head transmissibilities during exposure in Z-axis.…”

Section: Introductionmentioning

confidence: 99%

Seat-to-head Transfer Function of Seated Men ―Determination with Single and Three Axis Excitations at Different Magnitudes

et al. 2010

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“…For whole-body vibration, important contributions have been made by many, including: Fairley 21,22) , Holmlund 18,[23][24][25][26] , Mansfield 16,19,[27][28][29][30][31][32] , Matsumoto 33,34) , Miwa 35) , Nawayseh 36,37) , Rakheja [38][39][40][41][42] , and Smith 43,44) . Although contributions have been made by many individuals, example data presented here will be sourced primarily from the author's own work due to availability of raw data and knowledge of all experimental conditions.…”

Section: Example Impedance Data From the Literaturementioning

confidence: 99%

Impedance Methods (Apparent Mass, Driving Point Mechanical Impedance and Absorbed Power) for Assessment of the Biomechanical Response of the Seated Person to Whole-body Vibration

Mansfield

2005

Ind Health

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Exposure to whole-body vibration is a risk factor for the development of low back pain. In order to develop a fuller understanding of the response of the seated person to vibration, experiments have been conducted in the laboratory investigating the biomechanics of the seated person. Some of these methods are based on the driving force and acceleration at the seat and are reported in the literature as apparent mass, driving point mechanical impedance or absorbed power. This paper introduces the background behind such impedance methods, the theory and application of the methods. It presents example data showing typical responses of the seated human to wholebody vibration in the vertical, fore-and-aft and lateral directions. It also highlights problems that researchers might encounter in performing, analysing and interpreting human impedance data.

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“…The apparent mass has the advantage that it can be obtained directly from the measured acceleration and force at the driving-point and allows for necessary corrections to account for the inertia force due to the seat structure in a convenient manner 29) . The APMS based on driving-point measurements alone yields considerably smaller variability among datasets when compared to the STHT datasets 30) . Consequently, the vast majority of earlier studies have focused on measurements of APMS responses alone 29,[31][32][33] .…”

Section: Discussionmentioning

confidence: 99%

Biodynamic Response and Spinal Load Estimation of Seated Body in Vibration Using Finite Element Modeling

Wang

Bazrgari²,

Shirazi‐Adl

et al. 2010

Ind Health

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Trunk biomechanical models play an indispensable role in predicting muscle forces and spinal loads under whole-body vibration (WBV) exposures. Earlier measurements on the force-motion biodynamic response (impedance, apparent mass) at the body-seat interface and vibration transmissibility (seat to head) have led to the development of different mechanical models. Such models could simulate the overall passive response and serve as an important tool for vehicle seat design. They cannot, however, evaluate physiological parameters of interest under the WBV. On the contrary, anatomical models simulating human's physiological characteristics can predict activities in muscles and their dynamic effects on the spine. In this study, a kinematics-driven nonlinear finite element model of the spine, in which the kinematics data are prescribed, is used to analyse the trunk response in seated WBV. Predictions of the active model (i.e., with varying muscle forces) as compared with the passive model (i.e., with no muscle forces) compared satisfactorily with measurements on vertical apparent mass and seat-to-head transmissibility biodynamic responses. Results demonstrated the crucial role of muscle forces in the dynamic response of the trunk. Muscle forces, while maintaining trunk equilibrium, substantially increased the compression and shear forces on the spine and, hence, the risk of tissue injury.

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Definition of a Range of Idealized Values to Characterize Seated Body Biodynamic Response Under Vertical Vibration

Cited by 77 publications

References 0 publications

Seat-to-head Transfer Function of Seated Men ―Determination with Single and Three Axis Excitations at Different Magnitudes

Seat-to-head Transfer Function of Seated Men ―Determination with Single and Three Axis Excitations at Different Magnitudes

Impedance Methods (Apparent Mass, Driving Point Mechanical Impedance and Absorbed Power) for Assessment of the Biomechanical Response of the Seated Person to Whole-body Vibration

Biodynamic Response and Spinal Load Estimation of Seated Body in Vibration Using Finite Element Modeling

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