Abstract
In this study, the vibration total value of the acceleration transmitted to the wrist and elbow was measured in the laboratory with a group of 13 male subjects holding a cylindrical handle while modifying the coupling force under varying levels of vibration. The results were used to establish the relationship between hand-transmitted vibration and coupling forces and to compare with the relations proposed as part of an ISO Technical Specification, ISO/TS 15230-2. This was done to determine the suitability of the proposed relationships when variations are introduced on the level of vibration on the handle. While tracing back the origins of the relations proposed in ISO/TS 15230-2, this paper further brings in evidence of the importance of considering the role of coupling forces when evaluating the exposure to hand-transmitted vibration and provides additional evidence to support the relationships which are proposed as part of the ISO Technical Specification. Irrespective of the level of broadband random vibration excitation considered, the agreement with these relationships was found to be best when setting the reference coupling force at 50, 75, 100 and 125 N and whenever the coupling forces applied on the handle were maintained below 150 N.
Highlights
Prolonged exposure to hand-transmitted vibration (HTV) is associated with an increased risk of developing vascular, neurological, and musculoskeletal disorders of the hand–arm system known as hand–arm vibration syndrome (HAVS) [1]
Comparison with the International Standardization Organization (ISO)/TS 15230–2 Relationships from Total Vibration Ratios at the Various. To investigate their compliance with the coupling factor relationships recommended To investigate their compliance with the coupling factor relationships recommended in ISO/TS 15230-2 [11], the experimental results are further compared with the fitted in ISO/TS 15230-2 [11], the experimental results are further compared with the fitted curves curves and
The results presented in this study tend to confirm the coupling factor relationships proposed in ISO/TS 15230-2 [11], even when the magnitudes of the broadband random excitations differ from those that were used in their development
Summary
Prolonged exposure to hand-transmitted vibration (HTV) is associated with an increased risk of developing vascular, neurological, and musculoskeletal disorders of the hand–arm system known as hand–arm vibration syndrome (HAVS) [1]. Considering that the influence of many of these factors on the development of hand-transmitted vibration disorders is not entirely known at this time, it is recommended in Annex F of the ISO 5349–1 standard [2] to document them as much as possible when reporting the exposure. This additional information should serve to provide an improved understanding of the relationship between the hand-transmitted vibration measurements and the observed health effects. In view of the nonlinear nature of the hand–arm vibration system, this study is intended to investigate the relationship between the coupling factor and coupling force under varying levels of broadband random vibration excitation
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