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Abstract of the Article

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The evaluation of human vibration in sarcheshmeh copper mining trucks

Authors:
[ Hossein ali hakimi ] - supervisor of industrial health &safety department - sarcheshmeh copper complex
[ Elhani Zarfeshani ] - Inchargeof medical statistics& information -sarcheshmeh copper complex

Abstract:

Human vibration is defined as the effect of mechanical vibration on the human body . the mechanical vibration exists in factories, earth transport , sea , air line and around some of industrial machines and people and workers are exposed to intensities of vibration all the time. In Sarcheshmeh copper mining the mine stone transfer to first crushing and to other roads by trucks which are able to produce considerable vibration. For evaluation of exposure rate trucks operator with whole - body vibration in total: 3 bulldozer ,2 louder , 2 grader , 3 shovel and 15 vabco were researched and the measurement of equivalent acceleration ( AEQ by whole - body ) transducers tape 2522 B&K and a tri axial seat accelerometer are applied .simultaneous measurement is done in three axes such as x ,y ,z and as a result AEQ is calculated. According to the measurement result maximum acceleration level in Z directions is seen that original direction of vibration enter the body operator in order to find the performance of operator chair , equivalent acceleration value in operator cabin floor and on the chair at the All of truck are measured and then the relation between them is calculated . the relation of less than one means that chair in he decrease of vibration does good and relation over than one imply vibration resonance and relation equivalent one that say chair in the increase or decrease of vibration doesn't play any role.The measurement result say that maximum equivalent acceleration value is related to Bulldozer and then decrease excursion Grader, loader, vabco and shovel. As a comparison equivalent acceleration level with thresholds limit value presented by ISO defined that equivalent acceleration in all of trucks over than thresholds limit value. For decrease of vabco operator exposure with vibration and keep on health of worker the vabco , cabin chairs Replaced and suspension system are Repaired and equivalent acceleration Re measured .measurement result say that equivalent accelerations in all of vabco trucks are less than thresholds limit value .

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