An Investigation of the Effects of Drill Operator Posture on Vibration Exposure and Temporary Threshold Shift of Vibrotactile Perception Threshold

The present study involved performing an experiment to clarify whether vibration measurement values on the tool handle, in accordance with ISO 5349-1, can assess risk from workplace environments. investigated relationship between magnitude of a hand-held electric drill different operating postures. included determination participant’s temporary threshold shift (TTS) vibrotactile perception (VPT) at tip index finger. experimental hypothesis was that 5349-1 standard, include effect posture measurements obtained despite variation and test participants. hand-transmitted (HTV) applied using pre-cast concrete paving slab substrate (600 × 600 50 mm, 55 MPa) 10 mm diameter masonry bit (without hammer action). operated right hand twelve male subjects three working postures (n = 36). Vibration measured orthogonal directions according international standard procedure. magnitudes were expressed as root-mean-square (r.m.s.) acceleration, frequency-weighted Wh frequency weighting. Clause 4.3 states characterisation exposure is assessed acceleration surface contact primary quantity. results indicate TTS following not related handle. Therefore, automatic inclusion participant proven. suggest handle do predict after varying across research concludes measurement, does properly potential hazard authentic usage conditions