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A comparison of novel chassis suspended machines for sustainable forestry
KTH, School of Industrial Engineering and Management (ITM).
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.). (System- och komponentdesign)
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.). (System- och komponentdesign)ORCID iD: 0000-0001-6692-2794
2015 (English)In: Journal of terramechanics, ISSN 0022-4898, E-ISSN 1879-1204, Vol. 58, 59-68 p.Article in journal (Refereed) Published
Abstract [en]

Cut-to-length logging (CTL) is a mechanized harvesting process where trees are delimbed and cut to length directly at the stump. The main challenges for the manufacturers of forestry machines for CTL logging are to address new customer demands and tougher health and environmental legislations by finding means that: (1) further increase the harvesting and log transportation productivity, e.g. by enabling operation on eco-soils, (2) reduce the damage to the soil, e.g. by controlling the ruts depth and preserving the root layer, (3) reduce exhaust emissions, e.g. by reducing the rolling resistance, and (4) reducing the daily vibration dosage for the machine operators, e.g. by active chassis and cabin damping. This paper presents of a number of passive forwarder chassis suspension concepts and compares their performance from three perspectives: their gentleness to terrain and operator, as well as their potential for improved fuel efficiency. Based on multi-body dynamics simulations, it is shown that a passive pendulum arm suspension can reduce the lateral accelerations in a passively suspended cabin with 50% compared to traditional bogie machines when travelling in rough hard terrain.

Place, publisher, year, edition, pages
2015. Vol. 58, 59-68 p.
Keyword [en]
Bogie, Forest machine, Ground damage, Mobility, Multibody dynamics simulation, Off-road, Rough terrain
National Category
Environmental Management
Identifiers
URN: urn:nbn:se:kth:diva-165204DOI: 10.1016/j.jterra.2015.01.002ISI: 000351800200006Scopus ID: 2-s2.0-84923862318OAI: oai:DiVA.org:kth-165204DiVA: diva2:810430
Note

QC 20150507

Available from: 2015-05-07 Created: 2015-04-24 Last updated: 2017-12-04Bibliographically 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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Andersson, Kjell

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