Harvester Valmet 911 Snake and cable crane in steep terrain
Abstract
Rationalization efforts in forestry have lead to continuing improvement in the mechanisation of harvesting systems. The development of the Scandinavian based Harvester-Forwarder technology for passable terrain was a result of those efforts. The evolution of special carrier platforms allows harvester technology to operate on steep terrain (slopes up to 70%). For the subsequent extraction, forwarders cannot be used on slopes greater than 40% and therefore cable yarders are used. To date little is known about the optimal design of the interface harvester ¿ cable yarder. This project analysed the impact of mechanised harvesters felling and processing (Valmet 911 Snake) to the extraction productivity of cable yarders. The impact of high quality pre-bunching of turns is shown and guidelines for turn design are generated. Different extraction layouts, depending on harvester boom reach, are introduced and their effects surveyed. The results of the study clearly show the advantage of mechanised felling compared to motor-manual working systems. The productivity of the cable yarder extraction following harvester felling can be enhanced by 20-50%. This can be improved upon through high quality pre-bunching by the harvester. Different harvester boom reaches affect the desired extraction layouts and therefore an overall optimisation of the working system harvester and cable yarder is required.
Timber harvesting Harvester Cable Yarder Steep Slopes
Publikationen
Auswirkungen von verschiedenen Arbeitsweisen mit dem Harvester Valmet 911.1 X3M
Autoren: Volker Schnäbele Jahr: 2004
Master / Diploma Thesis
Leistungsdaten Valmet 911.1 X3 M
Autoren: Stampfer, K., Steinmüller, Th. Jahr: 2004
Forschungsbericht (extern. Auftraggeber)
Project staff
Karl Stampfer
Univ.Prof. Dipl.-Ing. Dr.nat.techn. Karl Stampfer
karl.stampfer@boku.ac.at
Tel: +43 1 47654-91001, 91501, 91511
Project Leader
17.02.2003 - 31.12.2004
Thomas Steinmüller
Dipl.-Ing. Thomas Steinmüller
thomas.steinmueller@boku.ac.at
Project Staff
17.02.2003 - 31.12.2004