Izvorni znanstveni članak
https://doi.org/10.5552/crojfe.2020.615
Time Consumption Analysis of Forwarder Activities in Thinning
Eduardo Hildt
orcid.org/0000-0003-2423-7523
; National University of Misiones/CONICET Forestry Faculty Forest Harvesting Chair Bertonni 124 3380 Eldorado, Misiones ARGENTINA
Andrés Leszczuk
; National University of Misiones/CONICET Forestry Faculty Forest Harvesting Chair Bertonni 124 3380 Eldorado, Misiones ARGENTINA
Patricio Mac Donagh
; National University of Misiones/CONICET Forestry Faculty Forest Harvesting Chair Bertonni 124 3380 Eldorado, Misiones ARGENTINA
Tomás Schlichter
; University of Buenos Aires (UBA) School of Agriculture Chair of Forestry San Martin 4453 C1417DSE Buenos Aires Autonomous City ARGENTINA
Sažetak
Forwarding can be divided into separate work elements. These are affected by several factors: forwarding distance, load volume, and types of assortments harvested. For a detailed planning of thinning, productivity models should include these factors. This study analysed the time consumption of forwarder thinning operations in five pine plantations in the north-east of Argentina, determining how the log size and log concentration affect each work element. Timeand- motion studies were carried out, recording the activities with digital video cameras, and tracking the forwarder movements with global navigation satellite system (GNSS) receivers. Different linear mixed models were fitted to estimate the time consumption of each work element in relation to different predictive factors. When driving on the road, the forwarders had an average speed of 71.6 m min-1 empty and 75.7 m min-1 loaded. When driving in the stand, the average speed was 56.9 m min-1 empty and 52.2 m min-1 loaded. These speeds did not correlate with the forwarder size or load volume. For the loading and unloading elements, the linear mixed model explained 56% and 49% of the variability considering only the fixed effect of the logs size and the load volume. For driving while loading, the total volume loaded, and the log concentration of the assortment loaded explained 50% of the time consumption variability, with 17% being explained by random effects. The general time and productivity model developed can be applied to support accurate decisions in the process of thinning planning.
Ključne riječi
logging; productivity; loading; log size; log concentration; payload; Cut-to-Length
Hrčak ID:
233575
URI
Datum izdavanja:
31.1.2020.
Posjeta: 909 *