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Investigating the dynamic behavior of a mid-sized forestry machine on sloped rough terrain
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).ORCID iD: 0000-0001-6692-2794
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2014 (English)In: 18th International Conference of the ISTVS, 2014Conference paper, Published paper (Refereed)
Abstract [en]

High-performing forestry machines, such as forwarders, must be able to handle large loads and to operate rough and sloped terrains. Present forwarders are almost exclusively six-or eight-wheeled machines with pairs of wheels mounted on bogies. Consequently, they have very limited chassis damping and levelling capabilities. Traditional forestry machine chassis design is unfavourable from an active machine levelling and operator full body vibration control standpoint. This paper analyses the dynamic behaviour of an existing mid-sized forwarder. The multi-objective concept performance is studied with multi-body simulations and response analysis. The main focus is to identify critical design issues of the machine, specifically while traveling in sloped terrain, and to compare its off-road performance with a new pendulum arm suspended forwarder, referred to as the XT28 machine. The main purpose of the presented investigation is to suggest criteria for assessing the performance of off-road forestry machines when operating on sloped and rough terrain. The target is to assist future research on the newly developed XT28 forwarder that is planned to be in the initial full scale test during the coming year.

Place, publisher, year, edition, pages
2014.
Keyword [en]
Chassis levelling, Forestry machine, Ground damage, Hydraulic suspension system, Lateral motion, Multibody dynamics simulation, Off-road, Rough terrain, Rut depth, Shear resistance, Soft soil tire model, Automobile bodies, Chassis, Forestry, Hydraulic machinery, Landforms, Roads and streets, Timber, Transportation, Forestry machines, Ground damages, Multibody dynamics simulations, Rough terrains, Shear resistances, Tire modeling, Suspensions (components), Damage, Machinery, Soil
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-168354Scopus ID: 2-s2.0-84926227181OAI: oai:DiVA.org:kth-168354DiVA: diva2:817353
Conference
18th International Conference of the International Society for Terrain-Vehicle Systems, ISTVS 2014, 22 September 2014 through 25 September 2014
Note

QC 20150605

Available from: 2015-06-05 Created: 2015-06-02 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. 38 p.
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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