20.500.12556/RUL-152283 Evaluation of different modes for yarding windthrown timber with a double-hitch carriage Yarding whole trees is the most efficient way of extracting timber in steep terrain and allows reaping the combined benefits of mechanization and biomass recovery. In downhill yarding, however, whole-tree extraction is associated with a greater risk of loosening rocks or debris by the incoming loads as they bounce around along the extraction corridor. That may also cause damage to the cables and anchors by corresponding shock loads, ultimately endangering the yarder and its crew. To avoid these risks, »double-hitch carriages« can be employed. They combine a conventional motorized dropline carriage with a secondary carriage (»trailer«), equipped with a further, independent dropline winch. Thus, loads can be attached at two points and transported fully suspended above the ground in a horizontal position. Operation of these carriages may not be limited to the »horizontal« mode: the main carriage could also be operated without trailer (»single« mode), or separate loads may be attached to the two droplines (»double« mode), but their impact on the efficiency and economy of yarding operations is yet unknown. Therefore, the present study investigated how these modes affect the productivity and cost of downhill whole tree yarding. To this end, a classic time and motion study was conducted during a salvage logging operation in Northern Italy under a strictly controlled experimental design. harvesting logging steep terrain carriage horizontal yarding work safety efficiency sečnja strmi tereni varstvo pri delu učinkovitost true false true Angleški jezik Slovenski jezik Članek v reviji 2023-11-16 13:29:09 2023-11-16 13:29:15 2023-11-17 03:36:37 0000-00-00 00:00:00 2023 0 0 Str. 245-257 iss. 2 Vol. 44 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2023-01-01 630*3 1848-9672 10.5552/crojfe.2023.2051 154775555 https://crojfe.com/archive/upcoming-issue/evaluation-of-different-modes-for-yarding-windthrown-timber-with-a-double-hitch-carriage/ 1 c435afb3-847b-11ee-b83b-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=177688 RAZ_Spinelli_Raffaele_2023.pdf RAZ_Spinelli_Raffaele_2023.pdf 1 51815FB78323A637B19B2BA6E684D55D ea3f72fa8fff92823d7ef40e9a81db3f334e026ec2337980fbcb5ec8a836fe5a 047ae761-847c-11ee-b83b-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=177689 Biotehniška fakulteta 0 0 0