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MODEL-BASED PERFORMANCE COMPARISON OF TRACKED FORWARDERS
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
KTH, School of Industrial Engineering and Management (ITM).
KTH, School of Industrial Engineering and Management (ITM).ORCID iD: 0000-0001-6692-2794
(English)Article in journal (Other academic) [Artistic work] Submitted
Abstract [en]

The predominant forest harvesting method in northern Europe is the cut-to-length (CTL) harvesting methodthat is performed by specialized two-machines, a harvester and a forwarder, and both machines are usually sixoreight wheeled machines with pairs of wheels mounted on bogies. Under soft ground or snow conditions, bogietracks and bogie chains are used to improve mobility and tractive performance. The main engineering challengewhen developing the next generation of forwarders is to reduce whole-body vibrations and soil damage. Due tothe small global market for CTL-machines, these challenges preferably should be addressed with a singlemachine architecture.The focus of this study is to analyse and compare the interaction with very soft soil and the dynamicperformance on hard rough terrain of a medium-sized forwarder equipped with two conceptually differentforwarder track units, namely a track unit with pendulum arm suspended ground wheels and bogie suspendedground wheels, with the performance of a wheeled and bogie-type of forwarder.The simulation results show that tracked forwarders have less negative impact on the soil than wheeledforwarders due to its significantly larger footprint area. Furthermore, it is shown that tracked forwardersequipped with pendulum-arm suspended road wheels are slightly gentler for the operator in terms of whole-bodyvibrations, when operating on hard rough terrain, compared to wheeled forwarders. Furthermore, they are alsosignificantly better than the bogie-type of track unit.

Keywords [en]
bogie, forestry, ground damage, off-road machine, rough terrain, whole-body vibrations, multibody dynamics
National Category
Engineering and Technology
Research subject
Engineering Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-200180OAI: oai:DiVA.org:kth-200180DiVA, id: diva2:1067706
Note

QC 20170123

Available from: 2017-01-23 Created: 2017-01-23 Last updated: 2017-01-23Bibliographically approved
In thesis
1. Suspended forestry machines for sustainable forestry
Open this publication in new window or tab >>Suspended forestry machines for sustainable forestry
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Cut-to-length (CTL) logging is a mechanized two-machine solution. The harvester processes treestems into smaller logs and a forwarder transports the logs from the logging site to a landing areaaccessible by trucks. The working machines for CTL logging are heavy and their suspension systemis generally rudimentary, basically the only damping is provided by the tires. To meet futuredemands on operator comfort, sustainable forestry, and climate concerns, significant challenges areto find means for reducing daily vibration dosage, soil damage, and rolling resistance.Paper A proposes a full-scale virtual model of a four-wheeled forwarder concept equipped with twopendulum axels with an actively controlled hydraulic suspension system mounted on each wheelaxle. The simulation results are then analyzed to determine the required actuation power.Paper B presents a performance comparison of a six-wheeled medium-sized pendulum-armsuspended forwarder, with three different suspension systems; active, semi-active, and passive. Amethodology to optimize and analyze forestry vehicle suspension performance based on multi-bodydynamic simulations are proposed and applied for the studied forwarder.Paper C is a model-based investigation of the dynamic behavior of a traditional eight-wheeledbogie type of forwarder with the main focus on identifying critical issues and suggesting criteria forassessing the performance of the machine while traveling on sloped and rough terrain.Paper D investigates the performance of a novel all-wheel-drive pendulum-arm suspendedmedium-sized forestry machine with passive and active chassis suspensions. The dynamicperformance of the pendulum-arm machine concept is quantified with simulations and comparedwith a “traditional” bogie-machine.Paper E investigates how to model a tracked forwarder and how the performance comparison canbe evaluated in multi-body simulation software like Adams ATV.Paper F presents a comparison of the dynamic behavior of forestry machines with different types ofpassive chassis suspensions from three perspectives: their gentleness to terrain, operator and theirpotential for improved fuel efficiency.Paper G proposes a 12 degrees-of-freedom multi-body dynamics simulation model of a standardeight-wheeled bogie type of medium-sized forwarder and verifies the simulation model withmeasured data from the field test that was carried out the actual machine.Paper H reconfigures the model presented in Paper G and compares a medium-sized forwarderequipped with two different track units with the performance of a wheeled and bogie-type offorwarder on hard rough ground, as well as on soft soil.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2016. p. 38
Series
TRITA-MMK, ISSN 1400-1179 ; 2016:08
National Category
Vehicle Engineering
Research subject
Machine Design
Identifiers
urn:nbn:se:kth:diva-200123 (URN)978-91-7729-227-2 (ISBN)
Public defence
2017-01-25, B319, Brinellvägen 85, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20170123

Available from: 2017-01-23 Created: 2017-01-23 Last updated: 2017-01-23Bibliographically approved

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