Variables Influencing Working Time and Skidder Productivity in Wood
            Extraction

Lopes, Eduardo da Silva; Oliveira, Diego de; Rodrigues, Carla Krulikowski; Drinko, Carlos Henrique

doi:10.5935/2318-7670.v05n04a12

Cited by 7 publications

(5 citation statements)

References 7 publications

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“…The search activities and loading and unloading of this research consumed less time of the operating cycle time. According to Sandhu (2008) and Lopes et al (2017), skidder occupies the longer in active form, i.e. performing the operations of empty and loaded displacement, and therefore consuming less proportional cycle time in loading and unloading, corroborating the results of this research.…”

Section: Average Effective Timesupporting

confidence: 83%

Performance of Grapple Skidder in Different Ground Inclinations

Diniz

Nakajima

Robert

et al. 2018

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Land slope contributes to decrease the productivity in the forestry sector activities, including skidding operations. Thus, it is important to study it in order to improve the forest operations planning. Based on this hypothesis, this study aims to analyze the times of the operational cycle and the productivity of the skidder in slope terrain. The study was conducted in Pinus taeda plantations of a forest company located in the CentralWest region of the state of Paraná, Brazil, in three slope classes: flat to moderate, steep and very steep. The data were obtained by the continuous timing method in a time study. Productivity and mean effective cycle time were determined for the three slope classes. The results show that the search and load and the unloading slopes are the ones that consume less time between the activities evaluated in the operational cycle. Considering the slope classes evaluated, flat to moderate and steep require less time to perform all activities of the operational cycle, and their productivities are higher, when compared to the very steep slope class. The productivity of the very steep slope class was 35.3% and 45.0% lower than the flat to moderate and steep classes, respectively. Skidding with skidder on slopes over 26.1º should be avoided because the productivity is negatively influenced in this condition.

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Section: Average Effective Timesupporting

confidence: 83%

Performance of Grapple Skidder in Different Ground Inclinations

Diniz

Nakajima

Robert

et al. 2018

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“…Regarding the machine elements, the loading and unloading of wood logs, which represented 17.7% of the grapple skidder's operational cycle time, indicated that the size of the stands did not influence these parameters. Lopes et al [47], Diniz et al [74], Naderializadeh and Crowe [75], and Ross et al [76] add that most of the operational cycle of this machine occurs actively, that is, is spent on activities associated with the greatest driving force of self-propelled forest machines. The optimization of the dimensioning of the stands in the forest areas is intended to adapt them to the management units, to facilitate silvicultural activities, fire prevention, and combat, and to minimize the operational cycle times of wood-harvesting activities.…”

Section: Discussionmentioning

confidence: 99%

“…The operational efficiency of the grapple skidder (Equation ( 2)) allowed us to express the percentage of time effectively worked in relation to the total time programmed [47].…”

Section: Technical and Economic Analysis Of Wood Extractionmentioning

confidence: 99%

Optimal Forest Road Density as Decision-Making Factor in Wood Extraction

Simões

Cavalcante

Lima

et al. 2022

Forests

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Forest road construction projects mainly depend on factors related to terrain physiography, watershed, and wood harvesting. In the whole tree system, wood extraction is the activity most impacted by the density of forest roads, influencing the extraction distance. One of the alternatives is the optimal forest road density approach, which allows for the minimization of wood extraction costs and the optimization of the productive area. Given the above, the objective of this study was to analyze whether the optimal forest road density in areas of forests planted with eucalyptus allows for maximum productivity and the lowest cost of the road-wood extraction binomial in a whole tree system. The technical and economic analysis of wood extraction was based on the study of time, operational efficiency, productivity, and the cost of wood extraction with a grapple skidder. For the optimal forest road density, the cost of the wood extraction activity was considered, as well as the cost of construction, reconstruction, and maintenance of roads. In addition, the cost of a loss of productive area and the cost of excess forest roads were weighted. The optimal forest road density was 30.49 m ha−1 for an average extraction distance of 81.99 m, with the cost of loss of productive area of 0.49 USD m³ and the excess road of 80.19 m, which represented a cost of 978.31 USD ha−1. It is concluded that the optimal forest road density allows for the identification of excess forest roads, allowing for a reduction in the total cost for the implementation of roads. Therefore, it can be considered an essential variable in the planning of the forest road network, providing improvements in productivity and the costs of wood extraction with a grapple skidder.

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“…The lower maintenance cost of the skidder can be explained by the machine's characteristics which has a closed hydraulic system, with greater protection of the hoses and greater robustness. Lopes et al (2017) also points out that this machine consumes longer operational cycle time in displacement, reducing exposure to trunks and branches, unlike what normally occurs with the feller buncher and harvester.…”

Section: Discussionmentioning

confidence: 99%