A Mechanical Impedance Investigation of Human Response to Vibration

Edwards, Richard; Lange, K. O.

doi:10.21236/ad0609006

Cited by 18 publications

(11 citation statements)

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“…The curves of transmissibilities (QRMS(H,A))and apparent mass (QRMS (FZ)) were in conformity with earlier data.6,7) The small deviations from linearity, indicated by these curves as a function of the intensity were considered by other authors2, [18][19][20]to be insignificant.…”

Section: Discussionsupporting

confidence: 86%

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The nonlinearity of the human body's dynamic response during sinusoidal whole body vibration.

Hinz¹,

Seidel²

1987

INDUSTRIAL HEALTH

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: This experimental study aimed at acquiring detailed data about the human transmission behaviour as a basis for an improved estimation of the strain, induced by whole body vibration (wbv). Four male subjects were exposed to vertical sinusoidal wbv (2-12 Hz 1.5 and 3.0 ms-2 RMS).The steady state force response was measured at the input interface, and accelerations were registered at the seat, head, shoulder, and upper trunk. Transmissibilities and apparent mass as quotients of RMS-values were determined. In addition, the corresponding quotients of peak values, as well as their accompanying phase angles were calculated separately for maximum acceleration or minimal acceleration, and for the extreme values of apparent mass in relation to the body mass.

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Section: Discussionsupporting

confidence: 86%

“…This feature of nonlinearity was observed at an intensity well below the critical one of 5 ms-2 mentioned by other authors. 2,8,[18][19][20] Fig. 6 provides an example.…”

Section: Discussionmentioning

confidence: 99%

The nonlinearity of the human body's dynamic response during sinusoidal whole body vibration.

Hinz¹,

Seidel²

1987

INDUSTRIAL HEALTH

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“…It would be a hopeless task to give an exact description of this complex system with respect to all kinds of excitation of the whole frequency range, not forgetting the fact that there is a great variation as to the individual. Biodynamic models for the human body have, however, been constructed by several authors (for example , Dieckmann 1958, Dieckmann 1959, Edwards & Lange 1964, Franke 1951, Muksian & Nash 1974, O'Hara 1966, Sandover 1971, Suggs et al 1969, Vogt et al 1968, Vogt et al 1973, Weis et al 1964 and have also been authorized in two international standards (ISO 5982 1981, ISO 7962 1987. For the hand and arm no international standard has been presented, but in the working-group ISO/TC 108/SC 4/WG 5 -"Biodynamic modelling" -such a standard is in preparation.…”

Section: Theory For Vibration Energy Estimationmentioning

confidence: 99%

Absorption of vibration energy in the human hand and arm

1994

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A possible basis for the risk assessment for hand-transmitted vibration may be to determine the amount of energy absorbed in the human hand and arm. In the present study, the mechanical energy absorption in the hand-arm system was measured within the frequency range of 4 to 1000 Hz. The study was carried out on ten healthy subjects during exposure to sinusoidal vibration. The influence of various experimental conditions, such as vibration direction (Xh, Yh, Zh), grip force (25-75 N), vibration level (8-45 mm/srms), and hand-arm posture were studied. The outcome shows that the energy absorption in the human hand and arm depended mainly on the frequency and direction of the vibration stimulus. Higher vibration levels, as well as firmer handgrips, resulted in higher absorption of energy. Varying hand-arm postures had only a small influence on the amount of absorbed energy, while the constitution of the hand and arm affected the energy absorption to a larger extent.

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“…The biodynamic response of the human body has been extensively investigated in the sitting posture, analysing the effect of anthropometric angles and of the vibration magnitude. The number of studies focused on the characterisation of the response of standing subjects is more limited (Coermann 1962;Edwards and Lange 1964;Miwa 1975;Griffin 1998, 2011;Subashi, Matsumoto, and Griffin 2006;Tarabini et al 2013a), although it might be useful in structural dynamics, when assessing the interaction between human beings and structural elements in terms of both the discomfort due to structuraltransmitted vibrations and the forces transmitted to the structure by the occupants. In addition, a better understanding of the physiological mechanisms at the basis of the measured response, in terms of resonances and contributions of the involved body parts (head, internal viscera and muscle activity), may improve current mathematical models for the response prediction (apparent masses and transmissibility).…”

Section: Introductionmentioning

confidence: 99%

Analysis of non-linear response of the human body to vertical whole-body vibration

et al. 2014

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The human response to vibration is typically studied using linear estimators of the frequency response function, although different literature works evidenced the presence of non-linear effects in whole-body vibration response. This paper analyses the apparent mass of standing subjects using the conditioned response techniques in order to understand the causes of the non-linear behaviour. The conditioned apparent masses were derived considering models of increasing complexity. The multiple coherence function was used as a figure of merit for the comparison between the linear and the non-linear models. The apparent mass of eight male subjects was studied in six configurations (combinations of three vibration magnitudes and two postures). The contribution of the non-linear terms was negligible and was endorsed to the change of modal parameters during the test. Since the effect of the inter-subject variability was larger than that due to the increase in vibration magnitude, the biodynamic response should be more meaningfully modelled using a linear estimator with uncertainty rather than looking for a non-linear modelling.

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A Mechanical Impedance Investigation of Human Response to Vibration

Cited by 18 publications

References 0 publications

The nonlinearity of the human body's dynamic response during sinusoidal whole body vibration.

The nonlinearity of the human body's dynamic response during sinusoidal whole body vibration.

Absorption of vibration energy in the human hand and arm

Analysis of non-linear response of the human body to vertical whole-body vibration

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