Influence of Support Conditions on Vertical Whole-body Vibration of the Seated Human Body

M-Pranesh, Anand; Rakheja, Subhash; DeMont, Richard

doi:10.2486/indhealth.mswbvi-25

Cited by 17 publications

(27 citation statements)

References 35 publications

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“…Briefly, the AM response of each subject seated on the rigid seat was initially measured, where the driving-point force was obtained from the conventionally-used force plate mounted underneath the rigid seat and from the seat mat placed directly on the seat pan. For the experiments, a rigid seat with a 449 £ 456 mm horizontal seat pan and a vertical backrest was mounted on the whole body vertical vibration simulator (WBVVS) platform through a force plate for measurement of the dynamic force at the seat base as described in M-Pranesh, Rakheja, and Demont (2010). The WBVVS was also equipped with a steering column with a steering wheel to provide hands support.…”

Section: Measurement Of Ammentioning

confidence: 99%

Effects of elastic seats on seated body apparent mass responses to vertical whole body vibration

et al. 2015

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Section: Measurement Of Ammentioning

confidence: 99%

Effects of elastic seats on seated body apparent mass responses to vertical whole body vibration

et al. 2015

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“…Furthermore, the contributions of the low inertia subsystems, in particular, are better understood from the 'through-the-body' responses compared to the 'to-the-body' response functions. However, owing to the complexity of vibration measurements of different segments and the errors associated with skin-mounted accelerometers due to relative movements of the skin over the bones [3], the vast majority of the studies have considered the transmission of vibration to the head as an adequate measure of the seated body biodynamics. Wang et al [4] stated that seat-to-head transmissibility (STHT) may be more representative of multiple vibration modes of the upper body than the apparent mass driving-point response.…”

Section: Introductionmentioning

confidence: 99%

Vertical and Fore-Aft Seat-to-Head Transmissibility Response to Vertical Whole Body Vibration: Gender and Anthropometric Effects

Dewangan

Shahmir

Rakheja

et al. 2013

Journal of Low Frequency Noise, Vibration and Active Control

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In this study, the biodynamic responses to vertical vibration are investigated in terms of seat-to-head vibration transmissibility (STHT) to study the effects of gender and eleven different anthropometric parameters on the STHT responses in the vertical and fore-aft directions. The STHT response of 31 male and 27 female human subjects were measured under three levels of vertical vibration (0.25, 0.50 and 0.75 m/s 2 rms acceleration) in the 0.50 to 20 Hz range, while seated without a back support and against a vertical back support with hands on a steering wheel. The results showed that the vertical and fore-aft STHT responses of the two genders were distinctly different. The primary resonance frequency of the male subjects was higher than the female subjects, while the peak magnitudes were comparable. The male subjects showed relatively greater softening effect, i.e. decrease in the primary resonance frequency with increase in excitation magnitude, as compared to the female subjects, irrespective of the sitting condition. The body mass revealed strong effect on both the male and female STHT responses. The primary resonance frequency of heavier subjects was lower than that of the lighter subjects, while the peak magnitude was higher for the heavier subjects. The male subjects showed significantly higher primary resonance frequency than the female subjects, even when comparable body mass, BMI and lean body mass were considered. The vertical STHT response of the two genders with same body fat mass was very similar for the sitting and excitation conditions considered in the study, particularly up to 10 Hz.

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“…The nonlinear behavior of transmissibility has been discussed previously in many studies. 19,26,27 Mansfield and Griffin,19 showed the nonlinear behaviour of apparent mass and transmissibility to the viscera, pelvis, and lumbar spine, and it was observed that the dynamics of tissues, the bending and buckling of the spine, and some complex responses of the body may be the cause for nonlinearity in biodynamic responses.…”

Section: Discussionmentioning

confidence: 99%

Seat-to-Head Transmissibility and Reading\\ Discomfort of the Seated Subjects Exposed to Whole Body Vibration

Kumara¹,

Saran²

2016

IJAV

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The transmission of vibration from the vibrating interface to various organs of the human body may influence their functioning during the vibration exposure. Therefore, an experimental study on a vibration simulator has been performed to find the effects of vibration on reading performance, and also to establish the relationship between seat-to-head transmissibility (STHT) with reading difficulty and reduction in reading performance. Twelve seated male subjects were exposed to sinusoidal vibration with three magnitudes (0.5, 1.0 & 1.5 m/s2 rms) at seven different frequencies (4, 5, 6.3, 10, 16, 20, and 25 Hz) in three independent directions (vertical, fore-and-aft, and lateral). The results show that three output measures-STHT, reduction in reading performance, and perceived difficulty in reading-are significantly affected by the frequency of vibration in each direction. All three measures have shown the peak at 4 or 5 Hz in three independent directions of vibration. Another peak at 25 Hz has also been observed for reduction in performance and perceived reading difficulty in vertical direction vibration. The results also show decrease in resonance frequency of the transmissibility with an increase in vibration magnitude, which represents nonlinear behaviour in biodynamic response by the human body.

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Influence of Support Conditions on Vertical Whole-body Vibration of the Seated Human Body

Cited by 17 publications

References 35 publications

Effects of elastic seats on seated body apparent mass responses to vertical whole body vibration

Effects of elastic seats on seated body apparent mass responses to vertical whole body vibration

Vertical and Fore-Aft Seat-to-Head Transmissibility Response to Vertical Whole Body Vibration: Gender and Anthropometric Effects

Seat-to-Head Transmissibility and Reading\\ Discomfort of the Seated Subjects Exposed to Whole Body Vibration

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