Set-up of Access Corridors in Thickets: A Comparison of Two Mulching Processes
Authors
Joachim Hamberger
Technical University of Munich Germany
Abstract
A Differential Global Positioning System (DGPS) -supported working procedure was developed for the mulching of access corridors in age class I stands in Germany. In an empirical investigation, this DGPS navigation procedure was compared to the conventional stake orientation procedure. In addition, a work study was carried out for the two procedures, and the accuracy and economic characteristics of both were compared.
The relative proportions of individual work elements within the processes are similar. The productivity is the same. There are ergonomic differences for the driver with the two procedures. During the stake orientation procedure the driver has to twist around in his seat for orientation, during heavy vibration. With DGPS navigation the driver does not need to turn his head. With the stake orientation procedure there is a high risk of injury for the person setting the stakes. DGPS navigation is a one-man working procedure, so nobody has to work in the danger zone.
Stake orientation is characterised by very straight mulching lines. Deviation from the prescribed route increases with increasing distance from the starting point. Obstacles in the area complicate this stiff orientation procedure. DGPS navigation enables the driver to keep to the prescribed line and to adapt vehicle movements dynamically to the obstacles in the area.
The economic characteristics of the two procedures were compared using the cost comparison method. The DGPS navigation procedure was found to be better economically because the work was carried out by one man only.
