Abstract
ObjectiveThe purpose of this paper is to examine the effectiveness of the proposed consideration for hand-transmitted vibration measurement on the human. MethodTo obtain the temporary threshold shift (TTS) in the fingertip vibrotactile perception threshold, the vibrotactile perception thresholds were measured before and after the subjects were exposed to hand-transmitted vibration from the hand-held tool. The vibration magnitude has been measured by using conventional vibration measurement on the tool and by using the proposed consideration vibration on the human simultaneously. ResultsThe proposed hand-transmitted vibration measurement on the subject was proportional with increasing TTS. In contrast the data from conventional vibration measurement on the tool shows a relatively constant vibration level while TTS increases within a subject group. ConclusionThe proposed measurement method of hand-transmitted vibration on the subject captures at least some of the effects of factors relating to the human interaction with the tool identified within Annex D of the ISO 5349-1 standard. The effectiveness of the proposed hand-transmitted vibration measurement consideration on the human for improved understanding of tool vibration exposure has been shown.
Highlights
Hand-arm vibration syndrome (HAVS) is a recognised industrial disease induced by excessive exposure to vibration through occupational tasks involving vibrating machinery
An experiment was performed to clarify the effectiveness of the consideration of a proposed hand-transmitted vibration measurement on the human
The results show that data acquired on the human using a wrist worn wearable device, with the proposed methodology, can be used for determining hand-transmitted vibration with enough accuracy to predict exposure risk
Summary
Hand-arm vibration syndrome (HAVS) is a recognised industrial disease induced by excessive exposure to vibration through occupational tasks involving vibrating machinery. CEN/TR 15350 advises that the exposure to vibration does depend on the machine used and to a large extent on the quality of inserted tools, the work situation and operator behaviour It concludes that these factors must be considered to make an ideal assessment of vibration exposure. Pan et al (2018) established that the coupling action influenced the vibration transmission to the wrist from the tool handle emitted vibration but did not model this as a coupling weighting coefficient From these results, it is clear that the vibration transmission is changed by the posture, coupling force, direction, handle diameter, and so on, the research does not show how to take such affecting factors into the vibration magnitude from the tool handle to the human hand, to determine the hand-transmitted vibration magnitude. The second is the demonstration of the effectiveness of the proposed methodology for assessing the human response to exposure to handtransmitted vibration
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