Publikasjoner
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2015
Sammendrag
© The Author(s) 2015. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Forfattere
Ellen J. Van Loo Vincenzina Caputo Rodolfo M. Jr. Nayga Han-Seok Seo Baoyue Zhang Wim VerbekeSammendrag
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Forfattere
Georgia S. Papoutsi Rodolfo M. Jr. Nayga Panagiotis Lazaridis Andreas C. DrichoutisSammendrag
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Forfattere
Siv Aarnes Ida Marie Luna Fløystad Julia Schregel Ole Petter Laksforsmo Vindstad Jane Uhd Jepsen Hans Geir Eiken Rolf Anker Ims Snorre HagenSammendrag
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Forfattere
Gisela Lüscher Philippe Jeanneret Manuel K. Schneider Andrew Hector Michaela Arndorfer Katalin Balázs András Báldi Debra Bailey Jean-Philippe Choisis Peter Dennis Sebastian Eiter Zoltán Elek Wendy Fjellstad Phillipa K. Gillingham Maximilian Kainz Anikó Kovács-Hostyánszki Kurt-Jürgen Hülsbergen Maurizio Guido Paoletti Susanne Papaja-Hülsbergen Jean-Pierre Sarthou Norman Siebrecht Sebastian Wolfrum Felix HerzogSammendrag
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Forfattere
Bruce Talbot Karl Stampfer Rien VisserSammendrag
An assessment of the benefits of a fully integrated yarder-processor was made against the alternative of splitting the yarding and processing functions onto two base machines. The effect of productivity rates, specific costs, and crew sizes on the relative performance of each working configuration was investigated. The systems analysis showed that for the integrated yarder machine, a two-man crew was considerably cheaper than a three-man crew at all yarding distances, although the difference became less pronounced with increasing mean tree volumes. The single integrated machine with a 2-man crew was cheaper than the modelled 2-machine system at medium and longer extraction distances, as the processor base machine in the 2-machine systems incurred a considerable cost penalty in waiting idly for the yarder. At shorter distances (75 m) the 2-machine system was cheapest, but became less competitive with increasing mean tree volume. For mid-sized trees (0.38 m3) on a medium corridor length of 150 m, overall system productivity rates ranged from 5.2 m3 per productive system hour (PSH) for the single machine system to 9.4 PSH−1 for the 2-machine system, although the specific net costs were almost identical at 31.5 € m−3. A sensitivity analysis showed that reduced labour costs would promote use of the 2-machine system, suggesting that the optimum system configuration would be country specific. Despite being marginally more costly in small trees at short corridor lengths (75 m), the single fully-integrated machine was considered the working configuration of choice under Norwegian conditions.