کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1710987 1519526 2015 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Machine function integration and its effect on the performance of a timber yarding and processing operation
ترجمه فارسی عنوان
یکپارچگی عملکرد ماشین و تاثیر آن بر عملکرد دوگانه و عملیات پردازش چوب
کلمات کلیدی
ورود به سیستم حیاط کابل تجزیه و تحلیل سیستم، برداشت
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی کنترل و سیستم های مهندسی
چکیده انگلیسی


• 3-man crew more expensive than a 2-man crew but difference decrease with tree size.
• Two machines twice as effective as integrated machine at shorter extraction distances.
• Costs of integrated machine with a 2-man crew similar to 2 machines.
• Rigging costs penalise 2-machine system because of higher capital costs.
• Integrated machine is preferable in countries with high wage costs.

An assessment of the benefits of a fully integrated yarder-processor was made against the alternative of splitting the yarding and processing functions onto two base machines. The effect of productivity rates, specific costs, and crew sizes on the relative performance of each working configuration was investigated. The systems analysis showed that for the integrated yarder machine, a two-man crew was considerably cheaper than a three-man crew at all yarding distances, although the difference became less pronounced with increasing mean tree volumes. The single integrated machine with a 2-man crew was cheaper than the modelled 2-machine system at medium and longer extraction distances, as the processor base machine in the 2-machine systems incurred a considerable cost penalty in waiting idly for the yarder. At shorter distances (75 m) the 2-machine system was cheapest, but became less competitive with increasing mean tree volume. For mid-sized trees (0.38 m3) on a medium corridor length of 150 m, overall system productivity rates ranged from 5.2 m3 per productive system hour (PSH) for the single machine system to 9.4 PSH−1 for the 2-machine system, although the specific net costs were almost identical at 31.5 € m−3. A sensitivity analysis showed that reduced labour costs would promote use of the 2-machine system, suggesting that the optimum system configuration would be country specific. Despite being marginally more costly in small trees at short corridor lengths (75 m), the single fully-integrated machine was considered the working configuration of choice under Norwegian conditions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biosystems Engineering - Volume 135, July 2015, Pages 10–20
نویسندگان
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