Influence of granular coefficient of rolling friction on accumulation characteristics

Han, Yingpeng; Jia, Fuguo; Yu-Rong, Tang; Yang, Liu; Zhang, Qiang

doi:10.7498/aps.63.174501

Cited by 19 publications

(11 citation statements)

References 19 publications

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“…According to Newton's Second Law of Motion, each particle model produces motion under the action of force and torque, and there is normal motion, tangential motion and rolling between particles. Based on the above assumptions, the Hertz-Mindlin (no slip), which is a default model in EDEM, was selected as the contact model of cotton stalk particles [32][33][34], as shown in Figure 2. In this contact model, the relationship equations between the normal force (Fn) and tangential force (Ft) of particles and the overlaps δn and δt in their respective directions can be expressed as:…”

Section: Simulation Contact Model Selectionmentioning

confidence: 99%

Section: Simulation Contact Model Selection and Model Construction 22...mentioning

confidence: 99%

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Calibration and Test of Contact Parameters between Chopped Cotton Stalks Using Response Surface Methodology

et al. 2022

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The accuracy of the material parameter settings directly affects the reliability of the results of the discrete element method simulation. It is necessary to calibrate the relevant parameters to obtain accurate discrete element simulation results when separating the cotton stalk particles from the residual film after crushing. The repose angle of the chopped cotton stalk particles was used as the response value to calibrate the contact parameters between particles. Physical tests measured the intrinsic particle and contact parameters between the cotton stalk particles and the contact material, which provided data for the simulation tests. According to the biological structure characteristics of cotton stalk, the discrete element method model of cotton stalk particles was constructed by bonding the elements of nonequal-diameter basic particles. Based on the response surface methodology, the stacking test of particles was simulated. The response model between the contact parameters and repose angle was established, and the effect law of the single-factor terms and interaction terms on the repose angle was analyzed. The optimal combination of contact parameters was obtained through the single-objective and multi-variable optimization methods. Finally, the contact parameter combination was verified by a simulation test of the repose angle. The results showed that the average relative error of the repose angle between the simulation test and the physical test was 1.04%, which verified the accuracy of the calibrated contact parameters and the reliability of the simulation test. These parameters provide a basis for the discrete element simulation study of cotton stalk motion in the separation process of cotton stalks and residual film and the subsequent gas–solid coupling simulation research.

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Section: Simulation Contact Model Selectionmentioning

confidence: 99%

Section: Simulation Contact Model Selection and Model Construction 22...mentioning

confidence: 99%

Calibration and Test of Contact Parameters between Chopped Cotton Stalks Using Response Surface Methodology

et al. 2022

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“…The basic material contact parameters in the EDEM simulation include the recovery coefficient, static friction coefficient, and rolling friction coefficient. The basic contact parameters between the materials were determined by virtual calibration experiments by using the prerequisite that the particle accumulation angles were the same in the simulation and in practice [16,17]. The stacking angle of the glass beads was measured at 25°.…”

Section: Model Building and Parameter Selection 21 Model Structure De...mentioning

confidence: 99%

Influence of rotational speed on the collision of mechanically plated galvanized layers based on discrete element method

Hao¹,

Wang²,

Wang³

et al. 2022

Surf. Topogr.: Metrol. Prop.

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A discrete-element numerical simulation method was used to investigate the effect of plating barrel speed on the density of the galvanized layer during mechanical galvanizing. The motion behavior between the impact medium and the substrate in the plating barrel at five rotational speeds (20, 30, 40, 50, 60 rpm) was investigated. Laws of collision and contact force variation between the substrate and the impact medium were obtained. The average thickness, relative density, and average deviation of thickness of the galvanized layer specimens were obtained at the same rotational speed. The results were compared with those obtained from the simulation. The increase in barrel rotational speed decreased the number of contacts between the impact medium and the substrate, but made the change in the number of collisions more regular. This was conducive to a regular force on the zinc powder particles and made the galvanized layer more uniform and dense. The contact force between the impact medium and the substrate increased with an increase in barrel speed. At 20 rpm, the impact medium could not provide enough contact force to melt the zinc powder particles into the substrate surface. Contact force increased abnormally at 60 rpm, which caused some of the zinc powder particles that were attached to the surface of the substrate to fall off, which affected the plating thickening. The average thickness, relative density, and average deviation of the galvanized layer in the comparison test were consistent with the simulation results. From 30 to 50 rpm, the relative density of the galvanized layer increased with an increase in speed. The average thickness and relative density of the obtained galvanized layer were highest and the average deviation of the thickness was lowest at a barrel speed of 50 rpm. The relative density and uniformity of the galvanized layers were optimized.

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“…Maize modeling and parameter calibration must be studied separately to develop a reliable maize model. The coefficient of rolling friction is an important contact parameter [8,9] . The parameters are indirectly obtained by approximating the experimental repose angle after gradually varying the coefficient of the rolling friction of the maize model [10] .…”

Section: Introduction mentioning

confidence: 99%

Analysis of the metering performance for typical shape maize seeds using DEM

Shi¹,

Zhao²,

Sun³

et al. 2023

International Journal of Agricultural and Biological Engineering

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The irregular shape, varying internal compositions, and uneven distributions of maize seeds can degrade the metering performance of maize seeders. This study investigates the effect of irregular maize on the performance of a high-filling-rate seed metering device using DEM. The results show that the seed population in the seed box formed large and small cycles of seed transport due to the disturbances caused by the three wheels. The increasing angular speed of the three wheels reduced the rate of seed filling in the seed filling regions by gravity and disturbances. In addition, an analysis of the repose angle formed by the dropped seed indicated that the angular speed of the taking seed wheel has a certain effect. The large angular speed reduced the coefficient of variation of the seed drop location. The repose angle of the horse tooth seed was greater than those of the other. Meanwhile, the irregular maize seed can also reduce the coefficient of variation of the seed drop location. A comparison between the simulation and experiment results indicates the number of metering seed were basically the same.

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Influence of granular coefficient of rolling friction on accumulation characteristics

Cited by 19 publications

References 19 publications

Calibration and Test of Contact Parameters between Chopped Cotton Stalks Using Response Surface Methodology

Calibration and Test of Contact Parameters between Chopped Cotton Stalks Using Response Surface Methodology

Influence of rotational speed on the collision of mechanically plated galvanized layers based on discrete element method

Analysis of the metering performance for typical shape maize seeds using DEM

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