Avaliação do Desempenho Operacional do harvester 911.3 X3M em Áreas Declivosas

Robert, Renato César Gonçalves; Silva, Flávia Alessandra Pinheiro Cordeiro e; Rocha, Márcio Pereira da; Amaral, Edvaldes José do; Guedes, lvânio Luiz

doi:10.4322/floram.2013.011

Cited by 5 publications

(5 citation statements)

References 4 publications

(4 reference statements)

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“…Sendo assim, pode contribuir com os gestores no planejamento e execução eficiente das operações florestais. Neste sentido, dentre as ferramentas disponíveis para estimativas de produtividade, citam-se os modelos estatísticos, que poderão estimar a produtividade do corte com o harvester em povoamentos florestais, os modelos propostos por Leite et al (2013), MacDonagh et al (2013), Robert et al (2013) e Seixas e Batista (2014).…”

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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Section: Introductionunclassified

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

Lopes

Oliveira

Roza

2017

View full text Add to dashboard Cite

show abstract

“…The percentage participation of the partial elements of the operational cycle of the harvester processor was represented predominantly by the search and processing element of the trees, with insignificant participation of the displacement element. This is a feature evidenced in the whole tree processing operation that differs from the work done with harvester in the short log system by Simões and Fenner (2010) and Robert et al (2013), in which these authors observed a longer time consumed with displacement. In addition, the time spent with the machine displacement was directly related to the volume of the bundle of trees deposited by the skidder on the edge of the field, where it was possible to note that the higher the IMV of the stand, the greater the volume of the bundles of trees and less the need of displacement of the machine.…”

Section: Discussionmentioning

confidence: 74%

Effect of Individual Tree Volume on Operational Performance of Harvester Processor

Rodrigues

Lopes

Pereira

et al. 2019

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The need to obtain multi-products from the forest makes the wood processing an important step in the timber harvest, being necessary, then, to understand the influence of the stand characteristics on the operational performance of the machines. The aim of this study was to evaluate the effect of the individual tree volume on the operational performance of the harvester forest processor in Pinus taeda L. stands, in order to assist in planning operations and reducing production costs. The analyzes were carried out by means of a time and motion study, determining the time consumed in the phases of the operational cycle, mechanical availability, operational efficiency, productivity, and production costs in three stands with different individual mean volumes (IMV): I (1.21 m3 tree-1); II (1.34 m3 tree-1) and III (1.61 m3 tree-1). In a completely randomized design, the averages of the variables were compared, as well as models for estimating productivity and production costs were fitted according to individual tree volume. The results showed that the processing element consumed a significant part of the total operational cycle time, with 46, 53 and 64% in treatments I, II and III, respectively, with an average operational efficiency of 56% in all treatments. Productivity increase and reduction of production costs were observed in the order of 43 and 30%, respectively, with the increase in IMV from 1.21 to 1.61 m3 tree-1. Such behavior can be represented by the third degree polynomial, which demonstrated the operational limit of 1.5 m3 tree-1 for the harvester forest processor.

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“…As also observed by Pereira et al (2012), in which the slope increased the total time of subsoiling operation in pasture area. On the other hand, Robert et al (2013) found no differences by studying the performance of a forest harvester working on high slopes, a fact that occurred due to the presence of continuous tracks.…”

Section: Resultsmentioning

confidence: 85%

“…On the other hand, Robert et al (2013) found no significant losses in operating capacity of a forest harvester to the slope of 27%. Therefore it is liable to study each operation to verify their limitations about the slope of their workable areas.…”

Section: Introductionmentioning

confidence: 78%

Operational performance of the mechanized picking of coffee in four soil slope

Tavares¹,

Silva²,

Santinato³

et al. 2016

Afr. J. Agric. Res.

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The coffee mechanized picking is an essential operation in modern coffee crop, however, is still an activity with few studies that emphasize the factors that could interfere in its operational performance. Assuming that the slope of the land can be one of these factors, it aimed to evaluate operational performance of a mechanized set of coffee picking in different terrain slopes. The treatments consisted of coffee mechanized picking in four slope lanes (0.0 to 5.0%, 5.1 to 10.0%, 10.1 to 15.0 and 15.1% to 20.0%) distributed in experimental design in lanes with three replications. The evaluation of the operational performance was materialized by means of timing and movements' analysis, collecting up time in operation, unloading and maneuvering, as well as efficiencies analysis of picking and cleaning. The operation was performed in crop with 1.133 kg of coconut coffee ha -1 to be picked. The slope of the land, from 15.1%, interferes in the performance of the harvester, significantly reducing the effective and operational field capacity. Slopes of up to 20% do not harm the cleaning efficiency; on the other hand, for picking efficiency, slopes higher than 15% significantly reduce the performance of the machines.

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Avaliação do Desempenho Operacional do harvester 911.3 X3M em Áreas Declivosas

Cited by 5 publications

References 4 publications

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

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

Effect of Individual Tree Volume on Operational Performance of Harvester Processor

Operational performance of the mechanized picking of coffee in four soil slope

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