Realisering av en modulär skogsmaskin - En skalmodell
Wood for commercial use is harvested from forests using forest machines like harvesters which folds, branches and cuts trees and forwarders which transports logs to a landing area for further transport to a processing facility. Future forest machines have to be much gentler to the machine operators and forest soil than today's machines. Hence new machine solutions must be developed and tested. A practical way is to develop a physical scale model which can be used as a test-bed to incorporate different types of solutions for suspensions, cabin damping, tires and tracks, crane and overall architecture. The aim of this project was to develop such a 1:5 scale model of a forest machine, named as ?Skogbil.A scaling strategy was employed to arrive at important scale dimensions and specifications ofSkogbil which would be comparable to the full scale model. Modular function deployment was implemented to identify modules and architecture of the system. Following this, various concepts of forest machine with pendulum arms, boogie arms and live axle suspensions were generated. A new architecture is proposed and manufactured with live axle suspension which is not common among forwarders today.Skogbilwill be driven using 8, 50 W hub-mounted brushless motors and gearboxes which would be controlled using a remote control. The complete driveline is powered by 24 V batteries whereas the articulation is powered using 2 standard R/C servos with a 7.4 V Li-Po battery.Component and system level verifications are performed to compare the dynamic behavior ofSkogbil with a full scale forwarder.