Comparison of DEM predictions and measured wall-media contact forces and work in a vibratory finisher

Maciel, Lucas da Silva; Spelt, J.K.

doi:10.1016/j.powtec.2020.02.014

Cited by 17 publications

(8 citation statements)

References 14 publications

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“…It is possible that the randomness in individual collisions of particles contributes to some of the small residuals between simulations and observations (Maciel and Spelt, 2019). However for the simulation of assemblies of particles, the macroscopic characteristic of group motion of particles can be well reflected by the DEM, as the individual random errors are equally distributed into assemblies of particles during the simulation.…”

Section: Structure Optimization Of Plough Bladesmentioning

confidence: 99%

Structure optimization of plough blades in a ploughshare mixer using the DEM simulations

Fang

Peng

et al. 2020

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Purpose The purpose of this paper is to optimize the structure of plough blades in a ploughshare mixer using the discrete element method (DEM) simulations. Design/methodology/approach Using the validated DEM model, three numerical tests are conducted to determine how the mixing performance evolves as structural parameters of blades change. Results from the analysis provide basis for structure optimization of blades. The structural parameters include sweep angle of blade γ, regular axial pitch p and regular circumferential angular offset α. The parameters to evaluate mixing performance include mass flow rate and Lacey index. Findings The DEM results show that the mixing performance at γ of 35° is better than 15°, 25° and 45°. The mixer which has a p of less than or equal to 1.11 · b is more efficient than the mixer which has a p greater than 1.11 · b, where b is tail width of blade. The circumferential symmetric distribution of blades (α = 180°) is more beneficial to improve the mixing performance in comparison with the circumferential asymmetric distribution (α < 180°). Based on the results, an optimized mixer with a γ of 35°, a p of 0.61 · b and an α of 180° is proposed, which has a better mixing performance compared to all mixers listed. Originality/value The structural parameters of blades, including γ, p and α, are found to be critical for good mixing. From the view angle of structure optimization of plough blades, a new ploughshare mixer with a γ of 35°, a p of 0.61 · b and an α of 180° is investigated and recommended for improving mixing efficiency.

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Section: Structure Optimization Of Plough Bladesmentioning

confidence: 99%

Structure optimization of plough blades in a ploughshare mixer using the DEM simulations

Fang

Peng

et al. 2020

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“…Also, the scatter plots of the observed wear volumes vs the energies for abrasive damage in wear region 3 is much less than those in wear regions 1 and 2 as shown in Figures 13 and 18. Since the measurement of the energy for abrasive damage involves not only the relative velocity but also the collision angle just before the collision as in Equation (6), the randomness in individual collisions of the structural boundary with particles in the DEM simulation 51 can contribute to some of the small deviations between the measured and the actual energy for abrasive damage. Provided that the individual random errors can be equally distributed into the sample data in linear regression, the less number of the scatter plots in wear region 3 can result in a larger effect of the randomness in individual collisions on the measurement precision of the energy in wear region 3, and also can bring a less obvious linear relationship between the observed wear volumes and the energies for abrasive damage in wear region 3, compared with wear regions 1 and 2.…”

Section: Case With Different Diameters D I Of Spherical Boundary Elemmentioning

confidence: 99%

A DEM‐based method for predicting the wear evolution of structural boundary composed of spherical boundary elements

Fang

Hu²,

Peng

et al. 2020

Numerical Meth Engineering

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Summary In the discrete element method (DEM) simulation for wear prediction, structural boundary is now represented extensively by triangular meshes with high resolution, which brings a huge computational cost. A DEM‐based method for predicting the wear evolution of structural boundary has been developed for computational efficiency. The structural boundary subjected to wear is represented by the spherical boundary elements in the DEM simulation in combination with the inside triangles and fitting curved surface in wear prediction. Wear prediction is performed through a series of evolution steps. In each evolution step, the collision energies by particles at structural boundary are collected via the DEM simulation and assigned to the boundary elements. Then, the volume losses of structural boundary are predicted across each relevant boundary element. Finally, the new geometry of structural boundary in response to wear is described by moving the boundary elements along the depths of wear individually. Through converting the contact detection between structural boundary and particles into between spherical boundary elements and particles, our method greatly reduces the computational cost in the DEM simulation. Through two numerical tests, our method has been verified to be an efficient and accurate method for the wear prediction of structural boundaries with different resolutions.

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“…On the other hand, the understanding and measurement of the trajectories of the abrasive media and workpiece is very important to the vibratory finishing process, and significant progress has been made both in mathematical simulations [7,8] and experimental studies [9][10][11][12]. In addition, the discrete element (DME) method has been employed in studies [13][14][15][16] for the mass finishing process. Hashemnia et al [17] studied the fluidized granular media at top, middle and bottom of the finisher using DEM simulation method.…”

Section: Introductionmentioning

confidence: 99%

Study on the Motion Characteristics of Abrasive Media in Vibratory Finishing

Liu

Wang

Jiang

et al. 2022

J. Phys.: Conf. Ser.

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In order to investigate the motion characteristics of the abrasive media in the vibratory finishing, the RecurDyn and EDEM coupled simulation method is employed. The simulation results show that the trajectories of the abrasive media are annular spiral motions in general, including a circular motion about the central axis of the vibratory finishing machine and an elliptical motion around the center of the media flow. The reliability of the RecurDyn-EDEM coupled simulation for the vibratory surface finishing process is validated by X-ray real-time detection, which has significance in better understanding of the motion characteristics of abrasive media and the optimal design of the vibratory surface finishing processes.

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Comparison of DEM predictions and measured wall-media contact forces and work in a vibratory finisher

Cited by 17 publications

References 14 publications

Structure optimization of plough blades in a ploughshare mixer using the DEM simulations

Structure optimization of plough blades in a ploughshare mixer using the DEM simulations

A DEM‐based method for predicting the wear evolution of structural boundary composed of spherical boundary elements

Study on the Motion Characteristics of Abrasive Media in Vibratory Finishing

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