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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), Machine Design (Dept.).
    Pirnazarov, Abdurasul
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Anderson, Kjell
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Löfgren, B.
    Investigating the dynamic behavior of a mid-sized forestry machine on sloped rough terrain2014In: 18th International Conference of the ISTVS, 2014Conference 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.

  • 2.
    Pirnazarov, Abdurasul
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Forestry machine and soil interaction for sustainable forestry2015Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    More than 50 percent of the land area of the Nordic countries Finland, Norway, and Sweden are covered by dense forests and they are among the most important producers of forest products in the world. Forestry in these countries is based on sustainable management principles – reforestation follows harvesting. Furthermore, increasing demands for more gentle techniques and technologies with less negative impact on the environment ask for development and implementation of new processes and new machine solutions. The increasing interest in developing forest management approaches that are based on gentleness to the environment requires better understanding of the interaction between the forestry machines and the terrain in the harvesting process.

  • 3.
    Pirnazarov, Abdurasul
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    On forestry machine and soil interaction for sustainable forestry2014Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    More than 50 percent of the land area of the Nordic countries Finland, Norway, and Sweden are covered by dense forests and they are among the most important producers of forest products in the world. Forestry in these countries is based on sustainable management principles – reforestation follows harvesting. Furthermore, increasing demands for more gentle techniques and technologies with less negative impact on the environment ask for development and implementation of new processes and new machine solutions. The increasing interest in developing forest management approaches that are based on gentleness to the environment requires better understanding of the interaction between the forestry machines and the terrain in the harvesting process.

    Paper A describes the purpose for model-based and simulation design of the next generation of forestry machines and proposes an enabling modeling and model configuration framework.

    Paper B presents the measured soil properties, ground pressure, and multi-pass rutting results from a field test with medium-sized forwarders operating on soft soil. The test data was then correlated with results from empirically-based WES-models.

    Paper C presents multi-pass rutting results for a tracked forwarder, with and without loading, operating on soft soil. Various models for predicting rutting was compared with the measured single- and multi-pass results for straight and S-curve driving.

    Paper D presents the reasons for, and the realization of, a test rig for characterizing the shear properties of rooted soil.

  • 4.
    Pirnazarov, Abdurasul
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Palaniappan, Revathi
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Sellgren, Ulf
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Löfgren, Björn
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Predicting the mobility of tracked forestry machines operating on Nordic forest soil2013In: 7th Americas Regional Conference of the ISTVS, 2013Conference paper (Refereed)
  • 5.
    Pirnazarov, Abdurasul
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Sellgren, Ulf
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Implementation of the WES mobility number in multi-body dynamics simulationsManuscript (preprint) (Other academic)
  • 6.
    Pirnazarov, Abdurasul
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Sellgren, Ulf
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Reduced testing and modeling of the bearing capacity of rooted soil for wheeled forestry machines2015In: Journal of terramechanics, ISSN 0022-4898, E-ISSN 1879-1204, Vol. 60, p. 23-31Article in journal (Refereed)
    Abstract [en]

    The next generation of forestry machines must be developed to be gentler to soil and to the root mat than present machines, especially in thinning operations. The bearing capacity of the soil is a key property for determining the terrain trafficability and machine mobility. This asks for better and more general terramechanics models that can be used to predict the interaction between different machine concepts and real and complex forest soil. This paper presents results from terramechanics experiments of rooted soil with a new and small-scale testing device. The force-deflection results are analyzed and compared with analytical root reinforcement models found in literature. The presented study indicates that rooted soil properties obtained with the new laboratory test device can be used to create an augmented soil model that can be used to predict the bearing capacity of rooted soil and also to be used in dynamic machine-soil interaction simulations.

  • 7.
    Pirnazarov, Abdurasul
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Wijekoon, Madura
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Sellgren, Ulf
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Löfgren, Björn
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Andersson, Kjell
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Modeling of the bearing capacity of Nordic forest soil2012In: 12th European Conference of the ISTVS, 2012Conference paper (Other academic)
  • 8.
    Sellgren, Ulf
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Pirnazarov, Abdurasul
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Andersson, Kjell
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Löfgren, Björn
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Model-Based Development of machines for sustainable forestry2012In: 12th European Conference of the ISTVS, 2012Conference paper (Other academic)
  • 9.
    Sellgren, Ulf
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Pirnazarov, Abdurasul
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Löfgren, Björn
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Development of a methodology for predicting the bearing capacity of rooted soft soil2013In: 7th Americas Regional Conference of the ISTVS, 2013Conference paper (Refereed)
1 - 9 of 9
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