The fidelity of a real time forest machine simulator
2007 (English)In: Fall Simulation Interoperability Workshop 2007, 2007, 377-398 p.Conference paper (Refereed)
It is essential to reduce the mental and physical stress on forest machine operators. The operator in a harvester cuts down one tree each 47 second, makes 12 decisions per tree and uses on average 24 functions per tree. In Sweden, we are using the Cut To Length (CTL) method, which means that the tree is cut in pieces out in the stand. This is done 1000 times a day. The solutions that come into our mind, to help the operators, are full or semi automation and other ways to improve the Human Machine Interaction (HMI). It is not practical or cost effective to initially develop automation or HMI ideas on real machines. Instead, a better solution is to use simulators. Normally, the existing forest machine simulators are used in teaching future forest machine operators. In our case, we use the simulator as a research tool. To rely on the result coming from tests with the simulator we performed a fidelity test. We conducted a time study, where a harvester operator have cut down approximately 500 trees and we have also measured data from the stand such as tree diameter, height, position, height to first live branch and tree type. We have also measured the terrain. The same stand and terrain data was implemented into the simulator and the same operator performed the same work again. The results demonstrated that there is a good fidelity between a real forest machine and the simulator. The time difference between the reality and the simulator is just ± 5 % for different work operations. Qualitatively, the results were on par. Several aspects on simulator fidelity will be discussed in the paper.
Place, publisher, year, edition, pages
2007. 377-398 p.
Fidelity, Forestry machine simulator, Real time simulator
Reliability and Maintenance
IdentifiersURN: urn:nbn:se:kth:diva-14282ScopusID: 2-s2.0-84867817857ISBN: 978-162276144-9OAI: oai:DiVA.org:kth-14282DiVA: diva2:332006
Fall Simulation Interoperability Workshop 2007; Orlando, FL; United States; 16 September 2007 through 21 September 2007
QC 201007292010-07-292010-07-292014-10-27Bibliographically approved