ارزیابی شدت ارتعاش دست–بازو در عملیات تبدیل درختان با استفاده از اره‌موتوری مدل MPTMGS5803

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه جنگلداری، دانشکدة منابع طبیعی، دانشگاه گیلان، صومعه‌سرا، ایران.

2 گروه جنگلداری و اقتصاد جنگل، دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران.

3 گروه جنگلداری، دانشکدة منابع طبیعی، دانشگاه گیلان، صومعه،سرا، ایران.

4 گروه بهداشت حرفه‌ای، دانشکدة بهداشت، دانشگاه علوم پزشکی گیلان، رشت، ایران.

5 آزمایشگاه بهره‌برداری از جنگل، دانشکدة جنگلداری و محیط‌ زیست طبیعی، دانشگاه ارسطو (Aristotle)، یونان.

10.22059/jfwp.2024.371383.1281

چکیده

اره‌های­ موتوری که به‌طور گسترده در عملیات قطع و تبدیل درختان استفاده می‌شود، ارتعاش ­های شدیدی ایجاد می‌کنند. ارتعاش طولانی‌مدت بدن کارگران ممکن است منجر به ایجاد اختلالات عروقی، حسی عصبی و اسکلتی عضلانی در اندام فوقانی کارگران اره‌موتورچی شود که به آن سندرم ارتعاش دست و بازو گفته می‌شود. اره‌موتوری MPTMGS5803 یکی از انواع ارهه­ موتوری پرکاربرد در جنگلکاری‌های غرب استان گیلان است که ارتعاش آن در هنگام انجام عملیات تبدیل درختان جنگلکاری در این تحقیق مورد بررسی قرار گرفت. اندازه‌گیری ارتعاش در هنگام انجام عملیات تبدیل درختان صنوبر، با استفاده از دستگاه ارتعاش‌سنجSVANTEK 106 A  به­ طور همزمان، در سه جهت x، y و z انجام و شتاب کلی ارتعاش اره­موتوری و دورۀ مواجهۀ روزانه محاسبه شد. نتایج پژوهش نشان داد که در دستۀ عقب و جلوی اره­موتوری به­ترتیب در جهت x (2/01±0/09)، (1/61±1/62) بیشترین و در جهت y (1/48± 0/17)، (0/73±0/09) کمترین مقدار شتاب ارتعاش وجود داشت. دستۀ عقب اره‌موتوری (0/54±3/05)، شتاب کلی لرزش­ بیشتری نسبت به دستۀ جلوی آن (0/53±1/94) داشت. نتایج حاصل از دورۀ مواجهۀ روزانه نشان داد که شدت ارتعاش وارد شده به کارگر اره‌موتورچی در مدت سه ساعت و هفتاد ثانیه کار با اره­موتوری در دستۀ جلو 1/19 و در دستۀ عقب 1/87 بود. با توجه به بررسی به‌دست آمده از لحاظ ارگونومیک، شتاب کلی ارتعاش این اره­موتوری کمتر از حد مجاز بود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Assessment of hand-arm vibration levels/exposure during motor-manual tree processing with the MPTMGS5803 chainsaw model

نویسندگان [English]

  • Fereshteh Rahimi Bitam 1
  • Meghdad Jourgholami 2
  • Mehrdad Nikooy 3
  • Mahmood Heidari 4
  • Petros A Tsioras 5
1 Department of Forestry, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Iran.
2 Department of Forestry and Forest Economy, Faculty of Natural Resources, University of Tehran, Karaj, Iran.
3 Department of Forestry, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Iran.
4 Department of Occupational Health, School of Health, Guilan University of Medical Sciences, Iran.
5 Lab of Forest Utilization, Faculty of Forestry and Natural Environment, Aristotle University of Thessaloniki, POB 227, Thessaloniki, Greece.
چکیده [English]

Chainsaws, which are widely used in tree felling operations, create vibrations. Long-term and intense exposure to vibration may lead to the development of vascular, neurosensory, and musculoskeletal disorders in the upper limbs of chainsaw workers, known as Hand-arm vibration syndrome. This study investigates the vibration levels during tree bucking operations on poplar trees with the MPTMGS5803 chainsaw model, one of the most widely used chainsaws in forest operations in the western part of Guilan province. Simultaneous vibration measurements in three directions (x, y and z) were carried out using the SVANTEK 106A vibration meter, aiming to determine the total amount of chainsaw vibration and the daily exposure period. The results show that the highest amount of vibration was measured in the x (1.61±0.62), (2.01±0.90) direction and the lowest in the y (1.48±0.17), (0.73±0.09) direction both in the rear handle and front handle of the chainsaw. The rear handle of the chainsaw had a higher overall vibration acceleration (3.05±0.54 m/s2) compared to the front handle (1.94±0.53 m/s2). In terms of the daily exposure period, the level of vibration exposure inflicted on the chainsaw operator during a  three-hour and 70 second working period amounted to 1.19 m/s2 in the front handle and 1.87 m/s2 in the rear handle, with both values falling within the permissible vibration range.

کلیدواژه‌ها [English]

  • Bucking
  • Hand-arm vibration
  • Musculoskeletal disorders
  • Occupational safety and health
  • Poplar
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