Calibration and Testing of Discrete Element Simulation Parameters for Urea Particles

Bu, Haoran; Yu, Siyao; Dong, Wancheng; Wang, Yuqi; Zhang, Lixin; Xia, Yuanqing

doi:10.3390/pr10030511

Cited by 7 publications

(5 citation statements)

References 23 publications

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“…Jiahui Ren et al measured the basic physical parameters and repose angle of sugar cane leaves through physical experiments, and conducted DEM simulation using the repose angle as the response value, which offered reference for parameter calibration of the strip-and blade-shaped straw materials [17]. Haoran Bu et al explored the contact parameters between urea grains and variable-rate fertilization by combining EDEM simulation and bench experiments [18]. To improve the accuracy of parameters used in DEM simulation of sunflower clearing, Xiaoxiao Sun et al conducted physical experiments and DEM simulation to calibrate the parameters of sunflower [19].…”

Section: Introductionmentioning

confidence: 99%

Physical parameter measurement and discrete element simulation parameter calibration with fresh Rhizoma polygonati

Zheng,

Hu,

Yang

et al. 2024

Preprint

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This study is aimed to solve the parameter shortage during discrete element method (DEM) simulation in mechanized deseeding of fresh Rhizoma polygonati, and to calibrate DEM simulation parameters of fresh R. polygonati using physical measurement and simulation trials. First, the physical properties of fresh R. polygonati from picking to 15 days of stacking, and the contact parameters between fresh R. polygonati and different materials along with the prolonging of stacking days were measured through physical experiments. Based on the physical test results, the parameters significantly affecting the repose angle of fresh R. polygonati were screened out via Plackett-Burman test. The collision recovery coefficient, static friction coefficient, and rolling friction coefficient between fresh R. polygonati fruits all significantly affected the repose angle of fresh R. polygonati. On basis of Plackett-Burman test, a steepest ascent test was designed to further clarify the ranges of the significant parameters. Targeting at the actual repose angle of fresh R. olygonati (27.23°), we conducted Box-Behnken test and obtained the optimal parameter combination for DEM simulation of fresh R. polygonati. Verification tests showed the relative errors between the simulated values and measured values of repose angle in fresh R. polygonati were less than 3%, which proves the DEM simulation parameters are reliable.

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Section: Introductionmentioning

confidence: 99%

Physical parameter measurement and discrete element simulation parameter calibration with fresh Rhizoma polygonati

Zheng,

Hu,

Yang

et al. 2024

Preprint

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“…The intrinsic parameters of black soil particles can be obtained experimentally, while some of the discrete elemental simulation parameters are not easily obtained. Therefore, the discrete element contact parameters of black soil were optimized for different particle sizes of black soil particles by using the multi-indicator total evaluation normalization method and response surface method [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Optimal Discrete Element Parameters for Black Soil Based on Multi-Objective Total Evaluation Normalized-Response Surface Method

et al. 2023

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The lack of accurate black soil simulation model parameters in the design and optimization of soil remediation equipment has led to large errors in simulation results and simulation outcomes, which to some extent restricts the development of soil remediation equipment. Accurate discrete element parameters can improve the efficiency of soil remediation equipment. To improve the reliability of the discrete element contact parameters for black soil, a set of optimal discrete element contact parameters was found that could comprehensively represent a variety of particle sizes and minimize error. In this paper, the best discrete element contact parameters were selected by using a multi-indicator total evaluation normalization method combined with the response surface method, combined with black soil solid and simulated stacking tests. First, the physical parameters of the black soil and the accumulation angle were determined. Next, Plackett–Burman tests were carried out for each grain size in turn to obtain the contact parameters that had a significant effect on the black soil accumulation angle. The important parameters obtained for different particle sizes are all as follows: black soil–black soil static friction coefficient, black soil–black soil rolling friction coefficient, and black soil–stainless steel rolling friction coefficient. In conjunction with the Plackett–Burman test screening results, the steepest climb test was designed for six grain sizes to optimize the range of values. To find the optimal contact parameters for the different particle sizes based on the final results of Box–Behnken experiments, the discrete element parameters of black soil were optimized for the different particle sizes of black soil by using the multi-indicator total evaluation normalization method and response surface method. The results showed that the black soil–black soil static friction coefficient was 1.045, the black soil–black soil rolling friction coefficient was 0.464, and the black soil–stainless steel rolling friction coefficient was 0.215. The errors for each particle size were reduced by 0.89%, 0.7%, 0.84%, 0.57%, 0.71%, and 0.76% for the best combination of parameters before and after normalization, with an average error reduction of 0.745%. This data provides some reference value for the design and optimization of soil remediation equipment.

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“…The fertilizer discharger is one of the critical components of fertilizer application machinery, and the existing fertilizer extractors are mainly divided into grooved wheel type and spiral type [4,5]. Both suffer from uneven fertilizer discharge due to their structural defects and cannot break down caking fertilizers.…”

Section: Introductionmentioning

confidence: 99%

“…The parameters of the Bond model for caking fertilizer have been determined. For the simulation process of granular fertilizer and caking fertilizer, the contact between granular fertilizer and granular fertilizer, caking fertilizer and caking fertilizer, granular fertilizer and caking fertilizer, granular fertilizer, and fertilizer discharge device, and caking fertilizer and fertilizer discharge device all occurred during the simulation test, the parameters obtained by referring to the team's previous research and related studies[26][27][28][29]are shown in Table2.…”

mentioning

confidence: 99%

Simulation Analysis and Test of Gap Squeeze Gear Type Fertilizer Discharger for Granular Fertilizer Containing Caking

Dun

Mao

et al. 2023

Preprint

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Precision fertilizer application technology is necessary to improve fertilizer utilization efficiency in agricultural production. To achieve precision fertilizer application and solve problems in production practice that contain the structure problem of the traditional mechanical fertilization systems, and the fertilizer discharger is blocked and can not achieve uniform fertilization because the fertilizer contains caking fertilizer in response to the characteristics of conventional fertilizers containing caking fertilizers, innovative design and system experimental simulation studies were carried out. A gap squeeze gear-type fertilizer dis-charger was designed, and fertilizer caking crushing was achieved by configuring the gear gap squeezing method. Combined with engineering practice, two mixed fertilizers (granular fertilizer with caking fertilizer) were constructed and blended by using BPM (Hertz Mindlin with bonding) discrete element, the fertilizer discharger was used as the object of study to simulate and experimentally investigate the process of crushing and discharging of mixed fertilizer and the process of uniform discharging of mixed fertilizer. The simulation test model of the separation device with vibration screen of the caking fertilizer and granular fertilizer after fertilizing was established to study the crushing rate of the caking fertilizer, and the simulation model with collection plate of the uniformity of the mixed fertilizer discharge was based on to explore the uniformity of the mixed fertilizer. The L9 (34) orthogonal test was carried out under the conditions with the number of teeth, pressure angle, and fertilization gap as test factors and the fertilizer crushing rate and fertilizer uniformity coefficient as test indicators. The test results showed that the number of teeth and pressure angle had significant effects (0.01 < P < 0.05) on the crushing fertilizer rate and fertilizer uniformity, and the fertilization gap had no significant impact (P༞0.05) on the crushing fertilizer rate and fertilizer uniformity. In the optimal combination of parameters, the number of teeth 6, pres-sure angle 15 °, fertilization gap 6mm operation, the coefficient of uniformity of crushing fertilizer rate and fertilizer uniformity were 74.89% and 17.21%, respectively. The bench test results compared with the outer groove wheeled fertilizer drainer showed that the optimized gap squeeze gear type fertilizer discharger has higher fertilizer crushing quality at different speeds, and the fertilizer crushing rate and uniformity were79.69% and 18.56%, respectively, within the error range. The simulation results are in general agreement. This study provides evidence for fertilizer discharger structure design and enhances the effect of fertilizer discharger crushing.

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Calibration and Testing of Discrete Element Simulation Parameters for Urea Particles

Cited by 7 publications

References 23 publications

Physical parameter measurement and discrete element simulation parameter calibration with fresh Rhizoma polygonati

Physical parameter measurement and discrete element simulation parameter calibration with fresh Rhizoma polygonati

Optimal Discrete Element Parameters for Black Soil Based on Multi-Objective Total Evaluation Normalized-Response Surface Method

Simulation Analysis and Test of Gap Squeeze Gear Type Fertilizer Discharger for Granular Fertilizer Containing Caking

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