Modeling of Forwarder Productivity and Costs in Thinned Pine Stands

Rodrigues, Carla Krulikowski; Lopes, Eduardo da Silva; Filho, Afonso Figueiredo; Silva, Matheus Kaminski Candido da

doi:10.5380/rf.v48i2.56195

Cited by 4 publications

(4 citation statements)

References 6 publications

(8 reference statements)

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“…In this way, it can be stated that the forwarder spends more time in the cycle operating passively, either by loading or unloading wood. These results corroborate with the results of several authors such as Simões and Fenner (2010), Lopes et al (2016), and Rodrigues et al (2018), who studied this machine in different situations regarding forest species and management regime. However, it is noteworthy that the time consumed in the loading described above tends to increase due to the difficulties of executing the operation inside the stand, and considering the precautions taken regarding damage to the remaining trees.…”

Section: Discussionsupporting

confidence: 91%

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Impact of Distance between Strip Roads on Productivity and Costs of a Forwarder in Commercial Thinning of Pinus Taeda Stands

Cabral

Lopes

Rodrigues

et al. 2020

Croat. j. for. eng. (Online)

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Demand for higher value-added wood products stimulates research for new, mainly mechanized, thinning operations in order to increase productivity and reduce production costs. In this context, the aim of this study was to evaluate the impact of distance between strip roads on forwarder productivity and costs of thinning operations in Pinus taeda stands. The study was carried out in 10-year-old Pinus taeda stands located in Parana State, Brazil. Two thinning methods were evaluated: (1) TH5: systematic harvest in every fifth tree row and selective harvest in adjacent rows; and (2) TH7: systematic harvest in every seventh tree row and selective harvest in adjacent rows. Working cycle times, productivity and costs were determined through a time-motion study of the forwarder. The additional variables evaluated were wood assortments (industrial wood and energy wood) and extraction distances (50, 100, 150 and 200 m), and mean values were compared between thinning methods using t tests for independent samples (α=0.05). Loading and unloading elements consumed the most time in the working cycle, with lower participation time in TH7 due to greater availability of logs along the strip roads (higher pile volumes), influencing total cycle time up to the mean distance of 150 m for both assortments. TH7 consequently showed 6% higher productivity, its energy yield was 5.3% lower and its production cost was 3.0% lower.

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Section: Discussionsupporting

confidence: 91%

“…usually removed in selective thinning (Lopes et al 2016, Acuña et al 2018, Cabral et al 2018, Rodrigues et al 2018.…”

mentioning

confidence: 99%

Impact of Distance between Strip Roads on Productivity and Costs of a Forwarder in Commercial Thinning of Pinus Taeda Stands

Cabral

Lopes

Rodrigues

et al. 2020

Croat. j. for. eng. (Online)

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“…In analyzing the forwarder behavior, loading was the partial working cycle element which consumed the longest time, followed by wood unloading. This result is a behavior expected by the forwarder, since it spends most of its time in passive form, loading and unloading as already mentioned by Rodrigues et al (2018a). However, an increase in the woodpile volume in the excess working range was evident in T2 when the effect of working ranges on the machine's working cycle was evaluated.…”

Section: Discussionsupporting

confidence: 72%

Effect of Working Range on Productivity and Costs of Harvesting Machines in a Eucalyptus Stand

Ruthes

Lopes

Rodrigues

et al. 2020

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Wood harvesting should be planned to reduce environmental impacts by minimizing machine traffic, increase productivity and reduce costs. In this context, the aim of this study was evaluate the effect of working range on operational performance of a harvester and forwarder in a Eucalyptus saligna stand under a clear cutting regime. The study was carried out in Paraná State, Brazil, in a cut‐to‐length system in cutting and wood extraction operations in two working ranges: T1 - width of 12 m with a cut of four planting lines; and T2 - width of 18 m with a cut of six planting lines. A time and motion study was performed to determine work cycle times, productivity, production costs, and machine traffic, with working ranges compared by the t-test (α = 0.05) for independent samples. The results showed that the wood processing and loading elements consumed the longest operating cycle time in cutting and wood extraction. The harvester machine presented higher productivity (61.05 m³ PMH0-1) in the T1 working range, while the forwarder was superior (48.32 m³ PMH0-1) in the T2 working range. Regarding the wood harvesting system, it was observed that the T2 working range enabled a reduction of 1% in production costs, which is important when considering the large scale production of the company, while there was a 33.4% reduction in traffic. Therefore, an increase in machines’ working range can provide operational and environmental benefits to wood harvesting operations in forest plantations.

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“…h -¹ for 6m. In studying the forwarder extraction operation, Rodrigues et al (2018) concluded that the loading time was the element which consumed most of the operational cycle time, and its productivity increased as the volume per tree increased and the average distance of extraction decreased.…”

Section: Productivity Measurementmentioning

confidence: 99%

Influence of Log Length on the Productivity of Wood Harvesting and Transportation

Belisario

Fiedler

Carmo

et al. 2022

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The selection of machines and the development of operating systems are the major challenge for reducing costs in harvesting and forest transportation. This work aimed to carry out a technical analysis of harvesting and forest transport activities in two different log lengths (6 and 7m). The operational cycles of the Harvester, Forwarder and combined road train vehicle in mechanized harvest areas were evaluated. The technical analysis was performed through studies of times and movements, determining the operational efficiency and productivity of the machines. According to the results, processing consumed most of the harvester's operational cycle, while in the forwarder, the most time was consumed 35,2 and 45,2 m³·he-1 and 42,84 and 75,42 m³.he-¹. The larger log size led to an increase in the productivity of the harvester by 28% and the forwarder by 48%. Among the studied models of road train vehicles, the one that showed the best results both in the analysis made with a length of 6 m and 7 m, was the dimensions with 2.35 m in width and 2.85 in height. These vehicles had a total gross weight of 63.52 tonnes for logs with a length of 6m and 69.17 tons for logs of 7m, with an 8.17% higher performance compared to 6m logs. With the obtained results it can be concluded that the increase in the length of the logs increased the productivity and the performance of the harvest and the forest transport.

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Modeling of Forwarder Productivity and Costs in Thinned Pine Stands

Cited by 4 publications

References 6 publications

Impact of Distance between Strip Roads on Productivity and Costs of a Forwarder in Commercial Thinning of Pinus Taeda Stands

Impact of Distance between Strip Roads on Productivity and Costs of a Forwarder in Commercial Thinning of Pinus Taeda Stands

Effect of Working Range on Productivity and Costs of Harvesting Machines in a Eucalyptus Stand

Influence of Log Length on the Productivity of Wood Harvesting and Transportation

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