Discrete element modeling of vibrating tillage tools

Abstract

Purpose -The analysis of the effect of tool vibrations on the measured and simulated draught forces of cultivator tools. This paper aims to discuss this issue. Design/methodology/approach -Soil bin measurements and discrete element method (DEM)-based simulations. Findings -The soil-tool interaction induced free vibrations of cultivator tools have significant impact on the measured draught force, and the simulations made by using vibrating tools give similar results. Research limitations/implications -Accurate calibration of discrete element model parameters can be done based on the reproduction of the whole Mohr-Coulomb failure line. Draught force ratiovelocity ratio values seem to be independent of tool geometry and soil conditions in case of velocity ratio higher than 2. Practical implications -DEM-based numerical simulations can be used for modeling the effect of tool vibration on the draught force values. During discrete element simulations of soil-tool interaction, the effect of tool vibration may not be neglected. Originality/value -The paper demonstrates that during the discrete element modelling of the soil-tool interaction, the tool vibration phenomenon should not be neglected.

Discrete element model calibration based on in situ measurements

“…This cycle is repeated multiple times to model the bulk material's mechanical behavior. For modeling the mechanical behavior of the soil, EDEM 2.7 discrete element software has been applied as a discrete element software using “Hertz Mindlin with bonding” contact model (Keppler et al , 2015).…”

“…Starting from the values evaluated in (Keppler et al , 2015), the micromechanical parameters of the discrete element model were systematically modified, until the simulated vane shear failure curve and the measured vane shear torque curve (Figure 7) presented an acceptable similarity.…”

“…In addition, by studying the effect of microscopic DEM parameters (adhesive energy, sliding friction coefficient) on macroscopic properties (angle of internal friction, bulk cohesion, dilatancy), quantitative analysis for calibration was given. The effect of tool vibrations on the experimentally measured and simulated cultivator tools' draught forces was investigated by Keppler et al (2015). The direct shear test was used for the calibration.…”

A Fast Algorithm for Particle Stacking

“…In the preliminary preparation stage of discrete element simulation [1][2][3][4][5], complementary and crossed particle set must be generated rapidly in the designated area, namely, particle accumulation. The stacking algorithm is mainly divided into two categories.…”

The feasibility of modelling rocks in engineering applications with the use of discrete element method

“…The modelling possibilities of soil-tillage interaction was already examined [1,2], which can be extended to study the effect of rocky soil on the cultivation tools. Rock crushers are often used to reclaim fields and also rock pickers for collecting stones.…”