Three-dimensional discrete element modelling (DEM) of tillage: Accounting for soil cohesion and adhesion

Üçgül, Mustafa; Fielke, John M.; Saunders, Chris

doi:10.1016/j.biosystemseng.2014.11.006

Cited by 160 publications

(60 citation statements)

References 14 publications

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“…Substitute formulas (10) and (11) into formula (3) to obtain the dynamics equation of the hydraulic excavator system:…”

Section: Kinematics Modelmentioning

confidence: 99%

“…With the development of numerical simulation technology, to more accurately predict the digging resistance, the discrete element model has become a research hotspot in connection with soil that has different properties (cohesionless, cohesion, and adhesion) [6][7][8][9][10][11]. Coetzee and Els [6] established a two-dimensional simulation model for the digging process of cohesionless granular materials, and the results show that the discrete element method is more accurate in predicting the amount of soil loading and the area and location of soil deformation but has comparatively low accuracy in predicting the material failure surface, traction force, and traction energy.…”

Section: Introductionmentioning

confidence: 99%

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Active‐Side Calculation Method for a Backhoe Hydraulic Excavator with Incomplete Digging Resistance in a Normal State

Ren

Wang

Chen

et al. 2019

Mathematical Problems in Engineering

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The digging resistance in a normal state is the key to excavator design and automated excavation. It is difficult to accurately predict, simulate, or directly measure the digging resistance in a normal state due to uncertainties in the soil properties and excavation parameters. In this paper, a research idea is proposed that uses the working device as the entry point to indirectly calculate the digging resistance in a normal state by measuring the motion parameters and the cylinder pressure intensity. Based on the rule of combination for spatial force systems, a method for combining and projecting the system of the digging resistance is proposed in which the system is projected as six parts, and the tangential force, normal force, and bending moment in the plane of symmetry of the working device are the objects of the solution to avoid redundant equations. Based on kinematics and dynamics models of the excavator and the force and moment equilibrium conditions of the working device, equations for the active-side calculation of the incomplete digging resistance are derived. Based on these equations, the motion parameters of the working device and data on the cylinder pressure intensity obtained by measurement are used to calculate the incomplete digging resistance. The validation scheme and process proposed use the incomplete digging resistance as the external load to obtain the simulated stress of the working device through transient analysis. The simulated stress and the measured stress corresponding to the position of the measurement point are extracted and compared. The results show that there is a difference in the size of the numerical value between the simulated and measured stress, but the variation law is highly consistent, which validates the calculation method. In this paper, an active-side calculation method is provided for the incomplete digging resistance in a normal state without considering the soil-tool interaction relationships, which lays a theoretical foundation for the study of the digging resistance characteristics in a normal state, as well as excavator design and automated excavation.

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“…Substitute formulas (10) and (11) into formula (3) to obtain the dynamics equation of the hydraulic excavator system:…”

Section: Kinematics Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Active‐Side Calculation Method for a Backhoe Hydraulic Excavator with Incomplete Digging Resistance in a Normal State

Ren

Wang

Chen

et al. 2019

Mathematical Problems in Engineering

View full text Add to dashboard Cite

show abstract

“…numerical method to solve and analyze the motion rules and mechanical characteristics of complex Discrete systems [4] . In recent years, the application of the discrete element method in agricultural engineering has become more and more mature, Huang et al used the discrete element method to numerically simulate the fluted-roller meter for metering diammonium phosphate fertilizer and verified the simulation through bench test [5] ; Ucgul et al used the discrete element method to simulate the cohesive behavior of soil and the interaction between tillage tools and soil under different water content and conditions, and verified the reliability of the simulation through experiment [6] . Computational Fluid Dynamics (CFD) is a discipline founded on classical mechanics and numerical methods, which is used for the analysis of systems including the physical phenomena of fluid flow, with computer numerical calculations and image display [7] .…”

Section: Introduction mentioning

confidence: 99%

Simulation and experiment of rice cleaning in air-separation device based on DEM-CFD coupling method

Ma¹,

Zhao²,

Guo³

et al. 2020

International Journal of Agricultural and Biological Engineering

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In order to study the movement characteristics and separation mechanism of rice and its impurities under the action of airflow, and lower the impurity rate in the cleaning operation process, rice and its impurities were modeled based on the "overlapping multi-sphere clump method", the DEM-CFD coupling method was used to simulate rice cleaning process under different airflow velocity and airflow inclined angle, and combined with aerodynamics, the motion state and separation behavior of rice and its impurities in the flow field. The results showed that under horizontal airflow conditions, the average impurity rate of rice was the lowest when the airflow velocity was 9 m/s. When the flow velocity remains unchanged and the airflow inclined angle was set at 10°, the average impurity rate decreased, while the entrainment loss rate increased. The airflow velocity was negatively correlated with the impurity rate and positively correlated with the entrainment loss rate, while the airflow inclined angle was negatively correlated with the impurity rate and positively correlated with the entrainment loss rate. By designing and setting up an experimental device, an experiment was carried out with airflow velocity and airflow inclined angle as the factors, and the experimental results were consistent with the simulation results, indicating that it was reliable to study the physical behavior of rice-straw separation in the airflow field by using the DEM-CFD coupling method.

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“…Then a linear cohesion model was integrated with the HSCM to model the plastic and cohesive behaviors of soil and its interaction with a tillage tool by Ucgul et al [ 18 – 20 ]. Direct shear tests were used to calibrate the model parameters [ 19 ]. The good correlations give confidence to recommend further investigation of the use of the hysteretic spring contact model for a wider range of soil conditions and types of tillage tools [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Study on the Interaction between Soil and the Five-Claw Combination of a Mole Using the Discrete Element Method

Yang

Jin

et al. 2018

Applied Bionics and Biomechanics

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A mole is a born digger spending its entire existence digging tunnels. The five claws of a mole's hand are combinative to cut soil powerfully and efficiently. However, little was known in detail about the interaction between the soil and the five-claw combination. In this study, we simulated the soil cutting process of the five-claw combination using the discrete element method (DEM) as an attempt for the potential design of soil-engaging tools to reduce soil resistance. The five-claw combination moved horizontally in the soil bin. Soil forces (draught and vertical forces) and soil failure (soil rupture distance ratio) were measured at different rake angles and speeds. Results showed that the draught and vertical forces varied nonlinearly as the rake angle increased from 10 to 90°, and both changed linearly with the speed increasing from 1 to 5 m/s. The curve of the soil rupture distance ratio with rake angles could be better described using a quadric function, but the speed had little effect on the soil rupture distance ratio. Notably, the soil rupture distance ratio of the five-claw combination in simulation was on average 19.6% lower than the predicted ratio of simple blades at different rake angles indicating that the five-claw combination could make less soil failure and thereby produce lower soil resistance. Given the draught and vertical forces, the performance of the five-claw combination was optimized at the rake angle of 30°.

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Three-dimensional discrete element modelling (DEM) of tillage: Accounting for soil cohesion and adhesion

Cited by 160 publications

References 14 publications

Active‐Side Calculation Method for a Backhoe Hydraulic Excavator with Incomplete Digging Resistance in a Normal State

Active‐Side Calculation Method for a Backhoe Hydraulic Excavator with Incomplete Digging Resistance in a Normal State

Simulation and experiment of rice cleaning in air-separation device based on DEM-CFD coupling method

Study on the Interaction between Soil and the Five-Claw Combination of a Mole Using the Discrete Element Method

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