Inter-cycle variation in whole-body vibration exposures of operators driving track-type loader machines

Newell, Geraldine S.; Mansfield, Neil J.; Notini, Luca

doi:10.1016/j.jsv.2006.06.015

Cited by 18 publications

(12 citation statements)

References 3 publications

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“…The WCA with the highest vibration was the Y-axis in 9 trucks, and the Z-axis in 96 trucks. This result is corroborated by previous studies (Özkaya, Goldsheyder, and Willems, 1997;Newell, Mansfield, and Notini, 2006). The vibration acceleration measured by Cann et al (2005) was 0.79-0.83 m/s 2 on the X-axis, 0.81-0.97 m/s 2 on the Y-axis, and 1.08-1.36 m/s 2 on the Z-axis.…”

Section: Evaluation By Vibration Accelerationsupporting

confidence: 90%

Assessment of whole-body vibration exposure of mining truck drivers

Erdem

Doğan

Duran

2020

J. S. Afr. Inst. Min. Metall.

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SYNOPSIS Whole-body vibration (WBV) exposure measurements taken from 105 truck drivers employed in 19 mines and other workplaces were evaluated with the criteria prescribed in EU 2002/44/EC directive, BS 6841 (1987), ISO 2631-1 (1997). and ISO 2631-5 (2004) standards. The highest vibration acceleration was measured on the vertical Z-axis. The highest WBV exposure occurred in the RETURN, HAUL, and SPOT phases while the lowest exposure took place in the LOAD and WAIT phases. Crest factors on all axes were generally greater than nine, yet strong correlation coefficients were achieved in VDV-eVDV analyses. Driver seats generally dampened the vibration along the Z-axis but exacerbated it along X and Y axes. The dominant frequency for the X and Y-axes rose up to 40 Hz while it ranged between 1 Hz and 2.5 Hz along the Z-axis. While the probability of an adverse health effect was higher with BS 6841 (1987) and ISO 2631-1 (1997) standards, it was low according to EU 2002/44/EC and ISO 2631-5 (2004). The 91 t, 100 t, and 170 t capacity trucks produced lower vibration magnitudes. Drivers were exposed to approximately equivalent levels of WBV acceleration and dose in contractor-type trucks and mining trucks. Rear-dump trucks exposed their drivers to a slightly higher level of vibration than bottom-dump trucks. Underground trucks exposed their drivers to a significantly higher level of vibration than mining trucks. Both driver age and driver experience were inversely proportional to vibration acceleration and dose. Conversely, there was a positive relationship between the truck service years and the WBV acceleration and dose to which drivers were exposed to. Loads of blocky material exposed drivers to higher vibration acceleration and dose levels than non-blocky material. Keywords: whole-body vibration, mining truck, A(8), BS 6841, EU 2002/EC/44, ISO 2631-1, ISO 2631-5, VDV(8).

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Section: Evaluation By Vibration Accelerationsupporting

confidence: 90%

Assessment of whole-body vibration exposure of mining truck drivers

Erdem

Doğan

Duran

2020

J. S. Afr. Inst. Min. Metall.

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“…Although vibration in work environments is almost always multi-axis (Paddan and Griffin, 2002;Burstro¨m et al, 2006;Johanning et al, 2006;Newell et al, 2006), most measurements of the biomechanical response of the seated person have only considered single-axis vibration. This is due to the practical difficulties of the requirement for laboratories with a multi-axis capability, the complexity of experimental design with multi-degrees of freedom for independent variables, and that, for linear systems, singleaxis data should be applicable in multi-axis environments.…”

Section: Introductionmentioning

confidence: 99%

The apparent mass of the seated human exposed to single-axis and multi-axis whole-body vibration

Mansfield

Maeda

2007

Journal of Biomechanics

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“…Although this paper reports vibration emission values for a range of earth moving machines, it is not recommended that these are used as a basis for risk assessments, as several of the data sets were obtained on proving grounds, where terrain and tasks were designed to be extreme and were not representative of typical working practices. The vibration profiles and factors affecting them have been discussed elsewhere 11,12) .…”

Section: Discussionmentioning

confidence: 99%

Earth Moving Machine Whole-body Vibration and the Contribution of Sub-1Hz Components to ISO 2631-1 Metrics

2009

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Occupational exposure to whole-body vibration (WBV) is a hazard linked to several adverse health effects. The most widely reported pathogenic effects of WBV exposure include the occurrence of lower back pain [1][2][3][4] although other reported effects include increased prevalence of herniated discs and neck-shoulder disorders 5) . Vibration can also adversely affect comfort and performance 6) . In order to assist in addressing the risks to health posed by occupational exposure to WBV, the European Physical Agents (Vibration) Directive (PA(V)D) 7) specifies limits on daily occupational WBV exposure. The PA(V)D mandates application of ISO 2631-1 8) as the metrological framework for measurements of daily WBV exposure severity and the application of the appropriate frequency weightings 9) .Within the context of impact on health, the methods prescribed by ISO 2631-1 (1997) stipulate evaluation of WBV within the frequency range 0.5 Hz to 80 Hz.However, the standard also states that when assessing WBV in terms of impact on health "If it has been established that the frequency range below 1 Hz is not relevant nor important, a frequency range from 1 Hz to 80 Hz can be substituted". ISO 2631-1 does not give criteria by which in one can deem WBV components below 1 Hz as 'not relevant nor important'. One interpretation of the statement could be that if there exists negligible vibration energy below 1 Hz, then there is no need to measure vibration using instrumentation capable of measuring such low frequencies as it is 'not important' (although this would mean that the instrumentation would fail to meet requirements specified in ISO 8041 10) ). Another possible interpretation could be that if the vibration is operator-induced then it is 'not relevant' to an assessment of vibration emission, as it is not caused by the machine per se, but by the driver; an example of this could be an individual driving a machine with repeated acceleration and deceleration with a short cycle time. Energy from each braking/acceleration manoeuvre would constitute part of the measured acceleration signal and, if there are a high number of such manoeuvres, these could dominate the

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Inter-cycle variation in whole-body vibration exposures of operators driving track-type loader machines

Cited by 18 publications

References 3 publications

Assessment of whole-body vibration exposure of mining truck drivers

Assessment of whole-body vibration exposure of mining truck drivers

The apparent mass of the seated human exposed to single-axis and multi-axis whole-body vibration

Earth Moving Machine Whole-body Vibration and the Contribution of Sub-1Hz Components to ISO 2631-1 Metrics

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