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2 2020

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Theoretical studies of dynamic soil compaction by wheeled forestry machines

Grigorev Igor, Kunickaya Ol'ga, Burgonutdinov Albert, Ivanov Viktor, Shuvalova Svetlana, Shvetsova Viktoria, Stepanishcheva Marina, Tikhonov Evgeniy

Diagnostyka

2020

Vol. 21, No. 4

3--13

The impact of forest skidding machine tires on the soil differs depending on topography, soil properties, and type of the wheel system. The development of a mathematical model describing the entire dynamic process is a challenging but relevant task to assess the level of impact. The work aims mathematical modeling of the impact caused by the skidding system on the forest soil employing Kelvin-Voigt theory with additional elastic element and Laplace transform equations. A dynamic model represents the "traktor-timber bundle– soil" system. According to the results of mathematical modeling, it was found that studying the vertical vibrations and vibrations of sprung mass in longitudinal and transverse planes is sufficient for examining dynamic soil compaction. Developed methods of statistical dynamics with the presentation of the track surface microroughness and the theory of linear elastic and viscous soil deformation showed that each pass of the skidding system is ac-companied by additional dynamic soil compaction. Its maximum value depends on the properties of the soil and skidding system, as well as on the presence of resonant zones in the frequency spectrum. The results of these studies provide an opportunity to predict the exposure level of skidders and establish new solutions to minimize negative consequences for the environment and productivity of the forest industry.

Assesment the effect of skidding techniques on the ecological efficiency of the skidding tractor

Grigorev Igor, Kunickaya Ol'ga, Burgonutdinov Albert, Burmistrova Olga, Druzyanova Varvara, Dolmatov Nikolay, Voronova Anna, Kotov Alexey

Diagnostyka

2020

Vol. 21, No. 3

67--75

The study aims to build a model for the assessment of soil compaction processes, which take place under the influence of individual components of the skidding system such as a forwarder and a log being moved over the terrain. This aim is relevant in the context of forest preservation and ecological footprint-related issues. The model of a single log impact on the soil is based on establishing calculation formulas for determining soil compaction factors and shelterbelt size. The efficiency of the model was assessed on different soil categories and compared to experimental findings. The value of relative soil compaction within the trail boundary and the size rs of the maximum compaction area in the radial direction from the track, the width of the shelterbelt of undergrowth or cut-to-length root system were estimated based on the initial contact parameters.