Author:
De Oliveira Pitz Natali,Sampietro Jean Alberto,Tonett Erasmo Luis,Ferrari Luis Henrique,Casemiro Soares Philipe Ricardo,Bonazza Marcelo,Alves de Vargas Daiane,Nicolleti Marcos Felipe,Gonçalves Robert Renato Cesar
Abstract
Background: Work studies are fundamental for the development and assessment of timber harvesting systems aimed at rationalising and improving forest management activities.
Methods: This study evaluated the operational performance of a mechanised whole-tree harvesting system in 32-year-old Pinus taeda L. stands producing multiple timber products. A time and motion study at the cycle element level was conducted to evaluate the operational performance of each component of the harvesting system. Equations were developed to estimate the productivity of tree extraction activity with a wheeled skidder and log loading with a mechanical loader.
Results: Tree felling with an excavator-based harvester had the highest mean productivity (135 m3 per productive machine hour), followed by tree extraction with a wheeled skidder (117 m3 per productive machine hour), while manually processing larger logs with a chainsaw had the lowest productivity (25.7 m3 per productive machine hour). Operator, extraction distance and mean log volume had a significant effect on the performance of different activities and were included in productivity models.
Conclusions: Operational performance of equipment was variable and dependent on the effect of the operator, extraction distance and log volume. Thus, the use of models to estimate productivity considering such factors, coupled with reduced delays to increase utilisation of equipment, will contribute to the better management and planning of forest harvesting operations under the evaluated conditions.
Reference30 articles.
1. Ackerman P., Gleasure E., Ackerman S. & Shuttleworth B. (2014). Standards for time studies for the South African forest industry. ICFR/FESA, South Africa. 49 p.
2. Alvares A.C., Stape, J.L., Sentelhas, P.C., de Moares Gonçalves, J.L. & Sparovek, G. (2013). Köppen's climate classification map for Brazil. Meteorologische zeitschrift. 22, 711-728. https://doi.org/10.1127/0941-2948/2013/0507
3. Behjou F.K., Majnounian, B., Namiranian, M. & Dvořák, J. (2008). Time study and skidding capacity of the wheeled skidder Timberjack 450C in Caspian forests. Journal of Forest Science, 54(4),183-188. https://doi.org/10.17221/5/2008-JFS
4. Björheden R., Apel K., Shiba M. & Thompson M.A. (1995). IUFRO Forest work study nomenclature. Department of Operational Efficiency, Swedish University of Agricultural Science, Garpenberg, Sweden. 16 p.
5. Conrad IV J.L. & Dahlen J. (2019). Productivity and cost of processors in whole-tree harvesting systems in southern pine stands. Forest Science, 65(6), 767-775. https://doi.org/10.1093/forsci/fxz036
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