Time consumption and productivity in manual tree felling with a chainsaw – a case study of resinous stands from mountainous areas

Câmpu, Răzvan V.; Ciubotaru, A.

doi:10.14214/sf.1657

Cited by 18 publications

(24 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, as can be seen in Figure 3 Tree size is one of the main characteristics influencing tree felling and processing with a chainsaw. The time consumed for the primary processing of felled trees increased as a function of the stem size [26]. Most studies use dbh as the main factor for estimating the productivity and work time by either linear equations [25,33,47,48] or the power function [27,49] and stump diameter in an exponential model [24].…”

Section: Resultsmentioning

confidence: 99%

“…Tree delimbing and cross-cutting in the felling area take more time than felling itself. In the felling area analysed in this study, 1 m 3 of wood was felled in 316.5 s (the felling operation was studied using a similar methodology under similar working conditions and the results were presented in a previous article) [26], while the delimbing and cross-cutting of 1 m 3 of wood took 536.32 s. [25] showed that delimbing and cross-cutting accounted for 43.98% of the felling operation (2.01 min•tree −1 and 4.57 min•tree −1 , respectively). [27] showed that felling took approximately 20% of the productive work time, and delimbing took 46% of the productive work time.…”

Section: Introductionmentioning

confidence: 99%

“…Sound knowledge of the factors which influence work time allows for better planning of harvesting operations so that deadlines can be met and damage to forest ecosystems be minimized. The models to be developed should be appropriate for giving accurate productivity estimates in coniferous harvestable stands from mountainous areas, as well as for cost calculations and different kinds of modelling and simulation purposes [26].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Delimbing and Cross-cutting of Coniferous Trees–Time Consumption, Work Productivity and Performance

Ciubotaru

Câmpu

2018

Forests

Self Cite

View full text Add to dashboard Cite

This research established the time consumption, work time structure, and productivity for primary processing in felling areas of coniferous trees felled with a chainsaw. Delimbing and partial cross-cutting were taken into consideration. The research was conducted in a mixed spruce and fir tree stand situated in the Carpathian Mountains. The team of workers consisted of a chainsaw operator and assistant with over 10 years of experience. The results indicated a total time of 536.32 s•m −3 (1145.26 s•tree −1), work performance (including delays) of 6.716 m 3 •h −1 (3.14 tree•h −1), and work productivity (without delays) of 35.459 m 3 •h −1 (16.58 tree•h −1). The chainsaw productivity during tree cross-cutting was 82.29 cm 2 •s −1. Delimbing accounted for 96.18% of the real work time, while cross-cutting accounted for 3.82%. The time consumption for delimbing and cross-cutting, as well as the work productivity and performance in the primary processing of coniferous trees in the felling area, were influenced by the breast height diameter, stem length, and tree volume, while the chainsaw productivity was influenced by the diameter of the cross-cut sections. The relationships between the aforementioned dependent and independent variables were determined by simple and linear multiple regression equations.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Delimbing and Cross-cutting of Coniferous Trees–Time Consumption, Work Productivity and Performance

Ciubotaru

Câmpu

2018

Forests

Self Cite

View full text Add to dashboard Cite

show abstract

“…Working time structure has been studied by numerous researchers, because working time consumption depends on many factors. Câmpu and Ciubotaru [34] and Ciubotaru and Câmpu [35] studied timber harvesting using chainsaws in Carpathian mountain stands. Wójcik and Petrów [36] investigated the impact of loggers' experience on productivity and labour consumption during the harvesting of timber from mature stands.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Season on Productivity and Time Consumption in Timber Harvesting from Young Alder Stands in Lowland Poland

Grzywiński

Turowski²,

Naskrent

et al. 2020

Forests

View full text Add to dashboard Cite

The purpose of this study was to establish the impact of season on productivity, labour consumption, and working time structure during timber harvesting from young alder stands (Alnus glutinosa Gaertn.). An early thinning process was performed in summer and winter in pure alder stands (38 and 40 years old) in the Płaska Forest Division (NE Poland). The felling and processing operations were performed by experienced loggers using the cut-to-length (CTL) system, and forwarding with manual loading and unloading involved the use of a Zetor 7045 (65 HP) farming tractor and trailer. In both summer and winter, the loggers spent most of their labour time on felling trees (approx. 23%) and bucking (approx. 36%). Assistant loggers spent most of their time stacking logs (49.2% in summer and 58% in winter). The most time-consuming activities in forwarding were loading, unloading, and transportation. The average time consumption of tree felling and processing amounted to 0.36 ± 0.11 h/m3; that of forwarding was lower, at 0.24 ± 0.07 h/m3. No statistically significant differences in the labour consumption of tree felling were identified between winter and summer (p = 0.863). For forwarding, labour consumption was significantly higher in winter (0.28 h/m3) than in summer (0.19 h/m3, p = 0.001). Average productivity was 3.02 ± 1.09 m3/h for tree felling and 4.76 ± 1.80 m3/h for forwarding. The productivity of felling was similar in winter (2.83 m3/h) and in summer (3.22 m3/h). For forwarding, productivity was significantly higher in summer (5.70 m3/h) than in winter (3.81 m3/h, p < 0.01).

show abstract

“…cutting efficiency) and duration of felling, and cross-cutting in motor-manual operations using chainsaws (e.g. Câmpu and Ciubotaru 2017;Marenče et al 2017;Ciubotaru and Câmpu 2018). However, only a limited number of studies are available on mechanised harvesting using CTL harvesters.…”

Section: Introductionmentioning

confidence: 99%

Cutting duration and performance parameters of a harvester’s sawing unit under real working conditions

2020

View full text Add to dashboard Cite

Amongst all the working elements of single grip harvesters, the working elements of felling and processing play an important role within the cut-to-length (CTL) harvester’s working phases. This includes the felling cutting and cross-cutting of stems within the felling and processing operation. The detailed investigation of such individual machine activities may help to analyse and improve the performance of forest machines. The objective of this study was to investigate the cutting duration and other performance parameters, including the fuel consumption, of a CTL harvester’s sawing unit under real working conditions. Detailed information on the felling cutting and cross-cutting performance was collected at short intervals using CAN bus data of two single grip harvesters in final felling from two different sites in Eastern Finland. As a result, models for effective time consumption in the work phase of cutting as a function of stem size were developed, both for felling cutting and cross-cutting. Felling cutting and cross-cutting durations were somewhat identical until the cutting diameters of 400–450 mm, depending on the site. Thereafter, the cutting time difference increased and was higher in felling cutting. At the site with large diameters of 550–650 mm, the difference varied between 15% and 28%, between the comparisons of formulae. In addition, other performance parameters, including the respective fuel consumption of this working phase, were part of the study. The study revealed a higher hourly based fuel consumption for the entire guide bar movement time compared to the pure cutting time in cross-cutting with stem diameters below 400 mm. Detailed knowledge of the performance of the sawing unit’s activities might help the planning process of future studies, as well as support the future development of efficient and intelligent machinery.

show abstract

Time consumption and productivity in manual tree felling with a chainsaw – a case study of resinous stands from mountainous areas

Cited by 18 publications

References 12 publications

Delimbing and Cross-cutting of Coniferous Trees–Time Consumption, Work Productivity and Performance

Delimbing and Cross-cutting of Coniferous Trees–Time Consumption, Work Productivity and Performance

The Impact of Season on Productivity and Time Consumption in Timber Harvesting from Young Alder Stands in Lowland Poland

Cutting duration and performance parameters of a harvester’s sawing unit under real working conditions

Contact Info

Product

Resources

About