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A discrete element model for soil-sweep interaction in three different soils

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Authors:
  • Chen, Y ;
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    unknown
  • Munkholm, Lars Juhl ;
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    Department of Agroecology - Soil Fertility, Department of Agroecology, Science and Technology, Aarhus University
  • Nyord, Tavs
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    Department of Engineering - Air Quality Engineering, Finlandsgade 12, Department of Engineering, Science and Technology, Aarhus University
DOI:
10.1016/j.still.2012.08.008
Abstract:
Soil–tool interactions are at the centre of many agricultural field operations, including slurry injection. Understanding of soil–tool interaction behaviours (soil cutting forces and soil disturbance) is important for designing high performance injection tools. A discrete element model was developed to simulate a slurry injection tool (a sweep) and its interaction with soil using Particle Flow Code in Three Dimensions (PFC3D). In the model, spherical particles with bonds and viscous damping between particles were used to simulate agricultural soil aggregates and their cohesive behaviours. To serve the model development, the sweep was tested in three different soils (coarse sand, loamy sand, and sandy loam). In the tests, soil cutting forces (draught and vertical forces) and soil disturbance characteristics (soil cross-section disturbance and surface deformation) resulting from the sweep were measured. The measured draught and vertical forces were used in calibrations of the most sensitive model parameter, particle stiffness. The calibrated particle stiffness was 0.75 × 103 N m−1 for the coarse sand, 2.75 × 103 N m−1 for the loamy sand, and 6 × 103 N m−1 for the sandy loam. The calibrated model was validated using the soil disturbance characteristics measured in those three soils. The simulations agreed well with the measurements with relative errors below 10% in most cases.
Type:
Journal article
Language:
English
Published in:
Soil and Tillage Research, 2013, Vol 126, p. 34-41
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2013
Scientific Level:
Scientific
ID:
233210899

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