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Evaluation Of Occupational Noise Exposure In Feller-Buncher Operators During Eucalyptus Tree Felling

出版	Morressier, 2017
URL	http://books.google.com.hk/books?id=7TLYzgEACAAJ&hl=&source=gbs_api

註釋The forest machine operator exposed to occupational noise levels aboveestablished limits may have temporary or permanent deafness, as well as sleep disorders, stress, blood pressure changes, among other occupational diseases. The objective of this study was to evaluate if the levels of occupational noise emitted by feller-buncher during the Eucalyptus harvesting operation are in compliance with Brazilian legislation in force. The study was carried out in the State of Su00e3o Paulo,Brazil, during the operation of eucalyptus trees on first rotation planting, executed by two fellers-bunchers: feller-buncher 1: Caterpillar brand CAT 541; feller-buncher 2 and John Deere, model 903M. The data were collected during the eight-hour workday, by means of a personal integrating meter, in accordance with the criteria established by the Occupational Hygiene Standard NHO 01 and by the Regulatory Norm # 15 adopted for purposes of unhealthiness in Brazil. When measuring the daily workload received by the feller-buncher 1 operator, the dose was 84.21% and the mean Lavg level was 83.76 dB (A), allowing 570 minutes as the time maximum permissible daily exposure, the dose was 90.40% for feller-buncher 2, therefore Lavg was 84.27 dB (A), which allows 531 minutes of exposure without atrial protection. It is noteworthy that theoperators had shell-type ear protectors, which used correctly, allowed the attenuation of 20 dB. Nevertheless, the values u200bu200bobtained are above the action value, justifying the adoption of preventive actions.