Energy Absorption of Seated Occupants Exposed to Horizontal Vibration and Role of Back Support Condition

Rakheja, Subhash; Mandapuram, Santosh; Dong, Ren G.

doi:10.2486/indhealth.46.550

Cited by 22 publications

(33 citation statements)

References 26 publications

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“…The VPA responses of the seated occupants exposed to single and three-axis vibration revealed very low values in the 0.5 Hz frequency band suggesting rigid system like behaviour of the seated human body, which is consistent with the reported studies [15][16][17][18][19]. The total VPA values of the seated occupant exposed to single axis fore-aft, lateral and vertical vibration increased with the rms acceleration magnitudes of vibration (Table 3) in a nearly quadratic manner, which is again consistent with the reported studies [15][16][17][18][19].…”

Section: Discussionsupporting

confidence: 90%

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Energy Absorption of Seated Body Exposed to Single and Three-Axis Whole Body Vibration

Mandapuram

Rakheja

Boileau

et al. 2015

Journal of Low Frequency Noise, Vibration and Active Control

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The absorbed power characteristics of seated body exposed to whole-body vibration along the individual and combined fore-aft (x), lateral (y) and vertical (z) axes are investigated through measurements of body-seat interactions at the two driving-points formed by the body and the seat-pan, and upper body and the seat backrest. The experiments involved two levels of back support (no back support and vertical backrest) and two levels of broad-band vibration with nearly constant acceleration power spectral density in the 0.5-20 Hz frequency range applied along the individual x-, y-and z-axis (0.25 and 0.4 m/s 2 rms acceleration), and along the three-axis (0.23 and 0.4 m/s 2 rms acceleration along each axis). The biodynamic responses, measured at the seat-pan and the backrest are applied to characterize the total seated body's energy transfer along each axis. Furthermore, an alternative frequency response function method H v is employed to capture the coupling in the seated body responses to uncorrelated multi-axis vibration. The total vibration absorbed power responses to simultaneous x, y and z -axis vibration are subsequently derived as the summation of vibration absorbed power along the individual axis within each one-third frequency band. The mean responses measured at the seat-pan suggest strong effects of the back support, and the direction and magnitude of vibration. The total vibration power absorbed by the seated body is further estimated under a multi-axis vibration environment of four different work vehicles. The results suggest that total average power absorbed under reported vehicular vibration varies with the effective acceleration in a nearly quadratic manner.

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Section: Discussionsupporting

confidence: 90%

“…It has been shown that the exponent is around 2 and 1.8-2.8 under vertical and horizontal vibration, respectively [17,19].…”

Section: Energy Absorption Of Seated Body Exposed To Single and Threementioning

confidence: 99%

Energy Absorption of Seated Body Exposed to Single and Three-Axis Whole Body Vibration

Mandapuram

Rakheja

Boileau

et al. 2015

Journal of Low Frequency Noise, Vibration and Active Control

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“…It has been shown that the proposed W d -weighting correlates reasonably well with the biodynamic responses of the body seated without a back support 4) . The biodynamic responses of the occupants seated with a back support and exposed to fore-aft WBV, however, differed significantly from those corresponding to sitting with a back support and exposed to lateral vibration 1,3,4,6,8) . The characterisation of biodynamic responses of the body seated assuming typical driving postures (back and hands supports) is thus essential for defining adequate frequency weightings for exposure assessments.…”

Section: Introductionmentioning

confidence: 82%

“…The lower frequencies under higher magnitude of vibration were attributed to the softening effect of the human body [1][2][3][4] . The STHT responses revealed relatively lower magnitudes but comparable resonant frequencies with increase in the magnitude of vibration (Table 4).…”

Section: Effect Of Excitation Magnitudementioning

confidence: 99%

“…The biodynamic responses of the seated occupants exposed to whole body vibration (WBV) have been widely investigated in terms of apparent mass (APMS) or driving-point mechanical impedance, seat-to-head vibration transmissibility (STHT) and absorbed power, under broad ranges of vibration and postural conditions [1][2][3][4][5][6] . The majority of these studies focus on response analyses of seated body exposed to vertical vibration although a few have investigated the responses to foreaft (x) and lateral (y) vibration 1,3) .…”

Section: Introductionmentioning

confidence: 99%

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Apparent Mass and Seat-to-head Transmissibility Responses of Seated Occupants under Single and Dual Axis Horizontal Vibration

et al. 2010

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Real‐time vibration monitoring and analysis of agricultural tractor drivers using an IoT‐based system

Singh

Nawayseh

Samuel

et al. 2023

Journal of Field Robotics

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Agricultural tractor drivers experience a high amplitude of vibration, especially during soil tillage operations. In the past, most research studied vibration exposure with more focus on the vertical (z) axis than on the fore‐and‐aft (x) and lateral (y) axes. This study examines how rotary soil tillage affects the vibration acceleration and frequency, and the power spectral densities (PSDs) at the seat pan and head along three translational axes in a real‐field multiaxis vibration context. Moreover, this study aimed to identify the characteristics of the seat‐to‐head transmissibility (STHT) response to identifying the most salient resonant frequencies along the x‐, y‐, and z‐axes. Nine (9) male tractor drivers operated the tractor with a mounted rotary tiller throughout the soil tillage process. In the event of a COVID‐19 pandemic, and to respect social distancing, this study developed an Internet of Things (IoT) module with the potential to integrate with existing data loggers for online data transmission and to make the experimentation process more effective by removing potential sources of experimenter errors. The raw acceleration data retrieved at the seat pan and the head were utilized to obtain daily exposure (A(8)), PSDs, and STHT along the x‐, y‐, and z‐axes. The vibration energy was found to be dominant along the z‐axis than the x‐ and y‐axes. A(8) response among tractor drivers exceeds the exposure action value explicitly stated by Directive 2002/44/EU. PSDs along the x‐, y‐, and z‐axes depicted the low‐frequency vibration induced by rotary soil tillage operation. The STHT response exhibited a higher degree of transmissibility along the y‐ and z‐axes when compared with that along the x‐axis. The frequency range of 4–7 Hz may plausibly be associated with cognitive impairment in tractor drivers during rotary soil tillage.

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Energy Absorption of Seated Occupants Exposed to Horizontal Vibration and Role of Back Support Condition

Cited by 22 publications

References 26 publications

Energy Absorption of Seated Body Exposed to Single and Three-Axis Whole Body Vibration

Energy Absorption of Seated Body Exposed to Single and Three-Axis Whole Body Vibration

Apparent Mass and Seat-to-head Transmissibility Responses of Seated Occupants under Single and Dual Axis Horizontal Vibration

Real‐time vibration monitoring and analysis of agricultural tractor drivers using an IoT‐based system

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