Modeling Productivity and Estimating Costs of Processor Tower Yarder in Shelterwood Cutting of Pine Stand

Papandrea, Salvatore F.; Stoilov, Stanimir; Angelov, Georgi; Panicharova, Tanya; Mederski, Piotr S.; Proto, Andrea Rosario

doi:10.3390/f14020195

Cited by 8 publications

(1 citation statement)

References 10 publications

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“…The model for pulling out the cable, on the other hand, had a much bigger slope, which applied to a lateral yarding distance range of approximately 120 m in the original study. These, as well as the findings of other studies which involved cable work [33], point out the same idea, namely, that the efficiency of manual work is lower in transportation processes compared to that of machine work. When one compares the potential noise exposure, however, the findings are not similar.…”

Section: Discussionsupporting

confidence: 64%

A Simulation Study of Noise Exposure in Sledge-Based Cable Yarding Operations

Borz,

Mederski,

Bembenek

2024

Forests

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Ensuring the safety of forestry workers is a key challenge, particularly when working with partly mechanized harvesting systems. Cable yarding is typically used in steep terrain timber harvesting. For long-distance extraction, one of the few alternatives is to use sledge yarders, but these machines may expose workers to high doses of noise. The goal of this study was to model haulers’ exposure to noise in sledge-based cable yarding operations, based on a simulation approach that considered variable factors such as the yarding distance, lateral yarding distance, and average skyline height. Taken into consideration were 165 scenarios developed by examining the variation in yarding distance (500 to 1500 m, with a step of 100 m), lateral yarding distance (10 to 50 m, with a step of 10 m), and average skyline height above the ground (10, 15, and 20 m). The simulations assumed an 8-h working day with a break of 1 h. The models and statistics published by other studies were used to calculate the time consumption and number of work cycles completed within a working day. These data were used to compute the equivalent exposure to noise (LAeq) for each scenario, as well as for those work elements that were likely to expose the haulers to noise the most. The presented findings indicated that (i) the exposure to noise was higher than 100 dB(A), irrespective of variation in the considered factors; (ii) the trend in exposure was characterized by polynomials in relation to the extraction distance, and the magnitude of exposure was consistently affected by variation in the considered factors; and (iii) without hearing protection, the empty and loaded turns exposed workers to noise over the permissible limits. These findings strongly suggest the use of hearing protection when working in close proximity to sledge-based cable yarding operations. The methods proposed in this study in the form of simulation may help benchmark other forest operations.

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Section: Discussionsupporting

confidence: 64%

A Simulation Study of Noise Exposure in Sledge-Based Cable Yarding Operations

Borz,

Mederski,

Bembenek

2024

Forests

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Effects of Cutting and Logging Processes on Tree Resprouting and Mortality in Chestnut Coppices in Southern Italy

Cataldo,

Lombardi,

Papandrea

et al. 2024

Lecture Notes in Networks and Systems

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Maximizing the economic benefit for cable yarding timber harvesting operations by spatially optimizing tree selection

Sforza,

Starke,

Dietsch

et al. 2024

Eur J Forest Res

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The efficiency of forest logging operations can be strongly affected by the layout of the harvesting pattern, which is usually based on silvicultural constraints and technical feasibility. Specifically, individual tree volume and the spatial distribution of trees significantly impact the overall harvesting performance. Spatial optimization of tree selection at the forest stand level may improve timber harvest efficiency by maximizing key performance indicators, such as the economic benefit, under given operational and silvicultural constraints. In this study, we applied two harvesting operation-optimization approaches based on integer programming for uphill cable yarding operations in mountain areas, including tree selection and load maximization. The first approach involves tree selection based on single tree harvest, while the second one performs tree selection based on tree clusters harvest per work cycle. As input elements a productivity model, derived by time-motion study with a Mounty MT50-2 and individual tree parameters extracted from high-resolution airborne laser scanning data, were prepared. Single tree information was further rated by financial value, and subsequently combined with the productivity model, allowing a detailed breakdown of operational costs. The results showed that optimizing the tree selection while respecting the allowable cut timber volume established in the harvesting plan can improve the efficiency of forest operations. The cluster approach was shown to be more efficient in terms of economic benefit compared to the actual selection, with an increase of 24.94%. However, the single tree approach resulted in a decrease of economic benefit compared to the actual selection, with a decrease of 22.85%.

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Modeling Productivity and Estimating Costs of Processor Tower Yarder in Shelterwood Cutting of Pine Stand

Cited by 8 publications

References 10 publications

A Simulation Study of Noise Exposure in Sledge-Based Cable Yarding Operations

A Simulation Study of Noise Exposure in Sledge-Based Cable Yarding Operations

Effects of Cutting and Logging Processes on Tree Resprouting and Mortality in Chestnut Coppices in Southern Italy

Maximizing the economic benefit for cable yarding timber harvesting operations by spatially optimizing tree selection

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