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  • 1.
    Ismoilov, Abbos
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Sellgren, Ulf
    KTH, School of Industrial Engineering and Management (ITM).
    Andersson, Kjell
    KTH, School of Industrial Engineering and Management (ITM).
    MODEL-BASED PERFORMANCE COMPARISON OF TRACKED FORWARDERSArticle in journal (Other academic)
    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.

  • 2.
    Ramachandran, Praveen
    et al.
    KTH, School of Industrial Engineering and Management (ITM).
    Ismoilov, AbbosKTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).Sellgren, UlfKTH, School of Industrial Engineering and Management (ITM).Löfgren, BjörnSwedish Forestry Research Institute, Skogforsk.Andersson, KjellKTH, School of Industrial Engineering and Management (ITM).
    MODEL-BASED ANALYSIS OF A TRACKED FORWARDER FOR SUSTAINABLE FORESTRY2015Conference 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.

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