Efeito do tempo de experiência de operadores de Harvester no rendimento operacional

Leonello, Elaine Cristina; Gonçalves, Shahine Paccola; Fenner, Paulo Torres

doi:10.1590/s0100-67622012000600013

Cited by 17 publications

(15 citation statements)

References 4 publications

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“…The most experienced operators were between 25% and 50% more productive than their least experienced colleagues, confirming past estimates -all in the range of 40% (Kirk et al 1997, Ovaskainen and Heikkila 2007, Purfürst and Erler 2011. Of course, these are very general figures that can be strongly affected by changes in working conditions and motivation over time (Leonello et al 2012). The study also found indications that more experienced and productive operators may use a different work technique than adopted by their less experienced and productive colleagues, as already suggested in the literature (Ovaskainen et al 2004).…”

Section: Impact On Productivity and Work Qualitysupporting

confidence: 81%

The Effect of New Silvicultural Trends on Mental Workload of Harvester Operators

Spinelli

Magagnotti²,

Labelle³

2020

Croat. j. for. eng. (Online)

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Close-to-nature (CTN) forestry offers many advantages, but makes management more complex and generally results in lower harvesting productivity and higher harvesting cost. While the higher harvesting cost of CTN is widely acknowledged, few ever consider the potential impact on operator workload, as the harvesting task becomes more complex. This study aimed to determine the mental workload of harvester operators under two silvicultural regimes: »pure conifer« stand and »mixwood« stand. In total, 13 harvester operators with varying experience levels were monitored for work performance and mental workload when operating a harvester simulator in two virtual stands designed according to the above-mentioned silvicultural regimes. Mental workload was assessed using the NASA Task Load Index (NASA-TLX) interview method and heart rate variability measurements, during two 30-minute test sessions performed in the »pure conifer« and the »mixwood« stand, respectively. As expected, operating in a more diversified »mixwood« stand resulted in a marked productivity loss, estimated between 40 and 57%. The study also confirmed the increased aggravation of mental demand, effort and frustration experienced by the operators when passing from the »pure conifer« stand to the »mixwood« stand. Such increase in mental workload was independent of the age and experience of the operators. Results can be used to paint a more holistic picture of CTN forestry and its implications for harvester operators. Besides increasing the number of subjects being monitored, future studies should focus on live forest operations.

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Section: Impact On Productivity and Work Qualitysupporting

confidence: 81%

The Effect of New Silvicultural Trends on Mental Workload of Harvester Operators

Spinelli

Magagnotti²,

Labelle³

2020

Croat. j. for. eng. (Online)

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“…Além disso, as operações de colheita mecanizada da madeira em povoamentos submetidos ao desbaste são afetadas por diversos fatores, podendo ser citados o tamanho dos talhões, a distância de extração, a declividade do terreno, a experiência do operador, o tipo de máquina, as características do povoamento (espécie, espaçamento, volume individual das árvores, volume por hectare), o modelo e a intensidade do desbaste, os sortimentos, etc. (OLIVEIRA et al, 2009;LEONELLO et al, 2012;SEIXAS e BATISTA, 2014;BARBOSA et al, 2015;LOPES et al, 2016).…”

Section: Introductionunclassified

Efeito De Variáveis Operacionais Na Produtividade De Um Harvester De Pneus No Desbaste De Pinus

Lopes

Oliveira

Roza

2017

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ResumoObjetivou-se avaliar o efeito da declividade do terreno, volume da árvore e tempo do ciclo operacional na produtividade de um harvester de pneus no desbaste de povoamento de pinus. O estudo foi realizado em uma empresa florestal no estado do Paraná, em povoamento de Pinus taeda L. submetido ao primeiro desbaste comercial aos 10 anos de idade, o qual foi realizado de forma sistemática na 7ª linha de plantio e seletivo nas linhas adjacentes. Foi realizado um estudo de tempos e movimentos da operação de corte pelo método de cronometragem de tempos contínuos, determinando-se a disponibilidade mecânica, a eficiência operacional e a produtividade. Foram ajustados modelos para estimar a produtividade da máquina em função do volume médio individual das árvores e do tempo do ciclo operacional em diferentes declividades do terreno. Os resultados mostraram que a disponibilidade mecânica e a eficiência operacional média foram de 91% e 83%, respectivamente. A produtividade média da máquina foi de 15,4 m³/he, não apresentando diferença significativa entre as declividades do terreno. Houve aumento significativo da produtividade da máquina no corte de árvores com volume médio acima de 0,19 m³. As variáveis declividade do terreno, volume da árvore e tempo do ciclo operacional explicaram 69% da produtividade do harvester na execução do corte em povoamentos de pinus submetidos ao primeiro de desbaste, podendo tais informações ser usadas no planejamento das operações florestais. Palavras-chave: Corte florestal; desbaste mecanizado; produtividade. Abstract Effect of operational variables on the productivity of a harvest of tire in thinning of pine.The aim of this study was to evaluate the effect of terrain slope, tree volume and time of the operational cycle on the productivity of a wheeled harvester in the thinning of a pine stand. The study was in a Pinus taeda L. plantation under first thinning at 10 years old, carried out systematically at 7 th row and selective in adjacent rows, conducted in a forestry company in Paraná, Brazil. A motion and time study of the cutting operational cycle was carried out, determining the mechanical availability, operational efficiency and productivity. Models were fitted to estimate the machine productivity in function of average volume of individual trees and time of operational cycle in the different slope conditions. The results showed that the average mechanical availability and operational efficiency were 91% and 83%, respectively. The machine average productivity was 15.4 m³/eh, with no significant difference between the terrain slopes. There was significant increase in productivity of machine at the cut trees with average volume above 0.19 m³. The terrain slope, tree volume and time of the operational cycle variables explained 69% of the harvester productivity in the cutting of pine stands submitted to the first thinning. These information can be used in the planning of forestry operations.

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“…For., Piracicaba, v. 44, n. 110, p. 443-451 Por outro lado, Leonello et al (2012), ao estudar o tempo de experiência dos operadores de harvester concluíram que o rendimento aumentou expressivamente nos primeiros 18 meses de experiência, mantendo-se em ascensão até os 44 meses de experiência.…”

Section: Resultsunclassified

A Influência da declividade do terreno e do tempo de experiência dos operadores no rendimento do feller buncher

Miyajima¹,

Tonin²,

Passos³

et al. 2016

Sci. For.

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A Influência da declividade do terreno e do tempo de experiência dos operadores no rendimento do feller buncher AbstractTerrain slope and operators time of experience significantly affect yield and, consequently, wood harvesting costs, which is one of the most costly activities of productive chain of planted forests. A full tree harvesting system was studied by comparing the performance of feller buncher according to the direction of slope and operators time of experience. A clonal eucalyptus forest was studied with a planting spacing of 3.00 m x 2.00 m and the forest was six years old at harvesting time. Data were obtained through a study of times and yields, by the continuous time method. Determined were yield, operational efficiency and the effective average cycle time. The average yield of feller buncher decreased with the increase of the terrain slope. On average, the yield was 124.92 m³ h -1 for the wavy slope and was 142.00 m³ h -1 for the flat slope. Yield was greater when comparing flat slope to wavy slope; it was 16.60% for the operator 2 and 19.93% for the operator 3. Regardless of the operators time of experience the yield was higher on the flat terrain when compared to wavy terrain. Regardless of terrain slope yield increased with increasing operator's time of experience. In flat slope the operational efficiency was higher when compared to the wavy one. Partial activity cutting was the most time consuming, followed by empty turning and tilting.

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Efeito do tempo de experiência de operadores de Harvester no rendimento operacional

Cited by 17 publications

References 4 publications

The Effect of New Silvicultural Trends on Mental Workload of Harvester Operators

The Effect of New Silvicultural Trends on Mental Workload of Harvester Operators

Efeito De Variáveis Operacionais Na Produtividade De Um Harvester De Pneus No Desbaste De Pinus

A Influência da declividade do terreno e do tempo de experiência dos operadores no rendimento do feller buncher

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