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    Evaluation of Whole-Body Vibration Exposure of Dozer Operators, a Task-Based Approach
    (Springer Heidelberg, 2022) Erdem, Bulent; Dogan, Tugba; Duran, Zekeriya
    The objective of this study was to evaluate the potential health risk associated with exposure of dozer operators to whole-body vibration. Measurements were made on 31 dozers used in different surface mines in Turkey. Predictions of adverse health effects of vibration were based on the standards BS 6841:1987, ISO 2631-1:1997, ISO 2631-5:2004, and the EU Vibration Directive:2002. Operators experienced high and comparable levels of vibration acceleration and dose during all dozer tasks: pushing the material (DOZE), moving forward (FORWARD), moving backward (REVERSE), and ripping (RIP). Specifically, DOZE, FORWARD, REVERSE, and RIP showed high potential of adverse health effects in terms of vibration dose according to the worst-case axis and vector sum criteria and a moderate adverse health effect for acceleration according to the worst-case axis criterion. Operators of large dozers were exposed to lower levels of vibration. However, no statistically significant relationship between vibration exposure levels and the propelling mechanism and the service time of dozers, operator experience, operator age, and ground type was found.
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    Noise and frequency propagation in natural stone processing plants
    (2024) Duran, Zekeriya; Erdem, Bülent; Dogan, Tugba; Genç, Mehmet
    In this study, 510 noise measurements recorded in eight natural stone processing plants operating in Sivas City, Turkey were evaluated and the noise levels and dominant frequency bands of 11 different processing machines used in these plants were determined. The daily equivalent noise level of all natural stone processing plants was around or above the exposure limit value (87 dBA) specified in relevant regulations. Considering the machines and plant environment, the frequency ranges for the highest noise levels were mostly between 630 Hz - 5000 Hz, centering around 3150 Hz. Variations in the noise level of the processing machines in separate plants where similar processes were carried out was primarily related to the plant size and machine layout, the number of machines operating simultaneously and the type of natural stone processed. While the difference between the noise levels of gangsaws, bridge cutting, ST cutting, head/side cutting, trimming, cement filling, slab polishing, narrow polishing, chamfering and splitting machines were statistically significant, aging machines generated similar noise levels.
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    Phase-based evaluation of whole-body vibration exposure for hydraulic excavator operators
    (Inderscience Enterprises Ltd, 2023) Dogan, Tugba; Erdem, Bulent; Duran, Zekeriya
    Hydraulic excavator operators' whole-body vibration exposure was studied with the guidelines set by several approaches. The most jolty and quiet phases were FORWARD and WAIT, respectively. Vibration magnitudes were inversely proportional to bucket capacity. Excavator service year and vibration exposure were positively correlated. Younger operators were exposed to higher levels of vibration. Vibration acceleration was negatively correlated to operator experience. Handling of large-sized rocks resulted in more vibration than soillike material. The most conservative method in estimating the hazard potential was the ISO 2631-1 'vector sum' while the probability of an adverse health effect was generally low according to the ISO 2631-5.