Izvorni znanstveni članak
Productivity and Time Consumption of Timber Extraction with a Grapple Skidder in Selected Pine Stands
Dariusz Kulak
; University of Agriculture in Krakow Faculty of Forestry Institute of Forest Utilization and Forest Technology Department of Forest and Wood Utilization Al. 29 Listopada 46 31–425 Krakow POLAND
Arkadiusz Stańczykiewicz
; University of Agriculture in Krakow Faculty of Forestry Institute of Forest Utilization and Forest Technology Department of Forest and Wood Utilization Al. 29 Listopada 46 31–425 Krakow POLAND
Grzegorz Szewczyk
; University of Agriculture in Krakow Faculty of Forestry Institute of Forest Utilization and Forest Technology Department of Forest and Wood Utilization Al. 29 Listopada 46 31–425 Krakow POLAND
Sažetak
This paper presents the results of the study on work time and productivity of the John Deere 548G-III grapple skidder operating in pine stands on flat terrain. The research covered three types of treatment: late thinning, removal cutting in openings and clear cutting in openings. The average skidding distance was between 120 and 250 m. In the clear-cut stands, a mean duration of a skidding cycle accounted for 12 minutes, while in the thinned ones it was longer, lasting ca. 16 minutes. The investigators performed an estimate of parameters of multiple regression models, which revealed dependences between:
Þ duration of skidding cycles and stand conditions, number of logs per load and skidding distance, and
Þ productivity achieved in specific skidding cycles and the above-mentioned variables, as well as wood volume per load.
The highest productivity within the productive work time of a skidder was recorded in the stand where removal cutting in openings was performed; it exceeded 14 m3×h-1. In other stands, the efficiency was lower, not greater than 9 m3×h-1. However, differences between the productivity achieved within the productive work time and that recorded for the work place time did not exceed 20%, which indicated that skidding operations in the stands under scrutiny were organised properly.
Ključne riječi
timber skidding; work efficiency; modelling of work time; productivity
Hrčak ID:
174450
URI
Datum izdavanja:
20.1.2017.
Posjeta: 2.779 *