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MODEL-BASED ANALYSIS OF A TRACKED FORWARDER FOR SUSTAINABLE FORESTRY
KTH, School of Industrial Engineering and Management (ITM).
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
KTH, School of Industrial Engineering and Management (ITM).
Swedish Forestry Research Institute, Skogforsk.
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2015 (English)Conference proceedings (editor) (Other academic)
Abstract [en]

Cut-to-length logging (CTL) is a mechanized harvesting process where trees are delimbed and cut to length directly at the stump. CTL is typically a two-man, two-machine operation with a harvester felling, delimbing, and bucking trees, and a forwarder transporting the cut logs from the felling area to a landing area accessible by trucks, or trains. The main challenges for the manufacturers of forestry machines for CTL logging are to address new customer demands and tougher ergonomic 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 rut depth and preserving the root layer, (3) reduce exhaust emissions, e.g. by reducing the rolling resistance and evening the contact and tractive forces between all traction units and ground, and (4) reduce the daily vibration dosage for the machine operators, e.g. with efficient chassis and cabin suspension solutions.This paper presents a model-based study of a novel tracked medium-sized forestry machine. The machine is a standard eight-wheeled forwarder of bogie type with the four bogies replaced with four passively suspended track units adapted from an off-road military vehicle. The paper briefly summarize how a tracked forwarder can be modelled and simulated using multi-body simulation software like Adams ATV and how the performance parameters can be evaluated.

Place, publisher, year, edition, pages
Italy: International Society for Terrain Vehicle Systems (ISTVS) , 2015. , p. 13
National Category
Forest Science
Identifiers
URN: urn:nbn:se:kth:diva-200133OAI: oai:DiVA.org:kth-200133DiVA, id: diva2:1067693
Conference
Proceedings of the 13th ISTVS European Conference, Rome
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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