scholarly journals Exploring the End-Liner Forces Using DEM Software

Minerals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1047
Author(s):  
Ngonidzashe Chimwani ◽  
Murray M. Bwalya
Keyword(s):  
Discrete Element Method ◽  
Size Distribution ◽  
Ball Milling ◽  
Discrete Element ◽  
Significant Cost ◽  
Cost Component ◽  
Dem Simulation ◽  
Ball Size ◽  
Ball Motion ◽  
Simulation Scheme

The main roles of liners are to protect the mill shell and promote effective ball motion for grinding. For this reason the liner profile is carefully selected to ensure that the productivity is maximized and due liner replacement is made when this objective is no longer met. These issues have been extensively studied on shell liners as mill relining is a significant cost component of ball milling. To date, not much has been written about end-liners and the kind of forces they are subjected to. A discrete element method (DEM) simulation scheme is conducted to look at how ball size distribution, mill filling, end-liner configuration and shape affect the distribution of forces acting on the liners that were assessed to understand end-liner wear and damage. The results showed how forces varied both radially and tangentially for the different sections of end-liner, with important insights drawn for end-liner manufactures.

scholarly journals Analysis of the Effect of Ventilation Bars on the Packing Structure of Sinter Bed by DEM Simulation

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3836
Author(s):  
Shingo Ishihara ◽  
Kizuku Kushimoto ◽  
Junya Kano
Keyword(s):  
Shear Flow ◽  
Discrete Element Method ◽  
Adhesion Force ◽  
Sinter Machine ◽  
Discrete Element ◽  
Angle Of Repose ◽  
Dem Simulation ◽  
Packing Structure ◽  
Experimental Values ◽  
Simulation Parameters

The effect of ventilation bars on the porosity of a sinter bed charged on a sinter machine was investigated. The behavior of the sinter feed was calculated by discrete element method (DEM) simulation. By taking into account the adhesion force, the sinter feed in the wet state was represented and the simulation parameters were determined to reproduce the experimental values of the angle of repose. The porosity of the sinter bed was calculated, and the mechanism of the formation of the packing structure and the cause of the distribution of porosity in each region were clarified. As a result, it is shown that in the case of shear flow, the higher the powder pressure during flow, the higher the porosity.

Improving the 3D Finite-Discrete Element Method and Its Application in the Simulation of Wheel–Sand Interactions

2018 ◽  
Vol 15 (07) ◽  
pp. 1850059 ◽  
Author(s):  
Chunlai Zhao ◽  
Mengyan Zang ◽  
Shunhua Chen ◽  
Zumei Zheng
Keyword(s):  
Finite Elements ◽  
Discrete Element Method ◽  
Size Distribution ◽  
Sphere Packing ◽  
Discrete Element ◽  
Numerical Results ◽  
Contact Detection ◽  
Discrete Elements ◽  
Contact Algorithm ◽  
Packing Algorithm

An efficient sphere-packing algorithm named hierarchical generation method (HGM) is developed. The method is capable of efficiently generating spheres with a specific size distribution in a given geometric domain. Moreover, an improved contact algorithm for contact detection between spherical discrete elements and hexahedron finite elements (INTS) is presented. The algorithm is also suitable for simulating complex wheel–sand interactions. By using the developed algorithm, the running behaviors of a chevron tread-pattern wheel on a sand bed are simulated. The sand bed model is established by HGM and wheel–sand interactions are simulated using INTS. Numerical results validate the feasibility of the proposed method in the simulation of wheel–sand interactions.

scholarly journals DEM simulation research of selected sowing unit elements used in a mechanical seeding drill

2019 ◽  
Vol 254 ◽  
pp. 02021
Author(s):  
Jacek Marcinkiewicz ◽  
Jarosław Selech ◽  
Żaneta Staszak ◽  
Łukasz Gierz ◽  
Dariusz Ulbrich ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Discrete Element Method ◽  
Mathematical Models ◽  
Discrete Element ◽  
Simulation Research ◽  
Dem Simulation ◽  
Bench Tests ◽  
Modern Computer ◽  
Design Solutions ◽  
Simulation Systems

The paper presents the results of research aimed at the verification of the existing design solutions of four example sowing units for agricultural seed drills with the most frequently used types of sowing wheels. The research was conducted with the use of modern computer simulation systems based on the discrete element method (DEM) with the evaluation of the efficiency of selected design solutions in terms of achieved performance and metering uniformity. The paper includes a description of virtual research models and the employed mathematical models used for mirroring contact between seeds. Moreover, for the purpose of verification of the obtained results, bench tests were conducted using actual models of selected design solutions.

scholarly journals Effects of Ball Milling Processing Conditions and Alloy Components on the Synthesis of Cu-Nb and Cu-Mo Alloys

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1224 ◽  
Author(s):  
Xuekun Shang ◽  
Xitao Wang ◽  
Silian Chen
Keyword(s):  
Size Distribution ◽  
Ball Milling ◽  
Oxidation Process ◽  
Processing Parameters ◽  
Processing Conditions ◽  
Cold Welding ◽  
Immiscible Alloys ◽  
Ball Size ◽  
Milling Method

The effects of processing parameters in ball milling and the different behaviors of Cu-Nb and Cu-Mo alloys during milling were investigated. High powder yields can be obtained by changing the BPR value and ball size distribution and no clear dependence of BPR value on powder yield can be found from the experiment results. The addition of oxygen can largely reduce the effect of excessive cold welding during ball milling. A “two-step” ball milling method was introduced to evaluate the different evolution processes and morphologies in different alloys. With 8 h pre-milling, this method considerably benefits the oxidation process of Mo and shows its promising potential in the synthesis of immiscible alloys. Based on the experiment results and analysis, we suggest that the different behaviors of Cu-Nb and Cu-Mo alloys are related to the shear modules and different tendencies to be oxidized.

DEM simulation of the local ordering of tetrahedral granular matter

Soft Matter ◽  
2019 ◽  
Vol 15 (10) ◽  
pp. 2260-2268 ◽  
Author(s):  
Bo Zhao ◽  
Xizhong An ◽  
Haiyang Zhao ◽  
Lingling Shen ◽  
Xudong Sun ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Dynamic Simulation ◽  
Granular Matter ◽  
Discrete Element ◽  
Local Order ◽  
Sphere Model ◽  
Mechanical Vibrations ◽  
Dem Simulation ◽  
Granular Assembly ◽  
Local Ordering

The formation and growth of local order clusters in a tetrahedral granular assembly driven by 3D mechanical vibrations were captured in DEM (discrete element method) dynamic simulation using a multi-sphere model.

Jaw Crusher Based on Discrete Element Method

2013 ◽  
Vol 312 ◽  
pp. 101-105
Author(s):  
Fu Sheng Mu ◽  
Hui Li ◽  
Xing Xue Li ◽  
Hong Zhi Xiong
Keyword(s):  
Energy Consumption ◽  
Discrete Element Method ◽  
Discrete Element ◽  
Working Process ◽  
Element Analysis ◽  
Dem Simulation ◽  
Force Condition ◽  
Jaw Crusher ◽  
Set Up ◽  
Element Method

In order to analyze the force condition and crushing power of crusher teeth plate, the discrete element method models of jaw crusher and double-cavity jaw crusher are set up respectively using EDEM, a kind of software for discrete element analysis. Meanwhile, the working process, the loading force on the teeth plate and crushing power are simulated. The results show that: the rationality of the DEM simulation is declared, and the crushing process of the particles is also shown intuitively. The loading force condition and the crushing power of the moving jaw teeth plate serve as basis for its abrasion and energy consumption respectively.

Study on the Particle Behavior in a Screw Conveyer System by the Discrete Element Method

2011 ◽  
Author(s):  
Yusuke Shigeto ◽  
Mikio Sakai ◽  
Shin Mizutani ◽  
Seiichi Koshizuka ◽  
Shuji Matsusaka
Keyword(s):  
Discrete Element Method ◽  
Large Scale ◽  
Discrete Element ◽  
Dem Simulation ◽  
Memory Space ◽  
Industrial Systems ◽  
Simulation Techniques ◽  
Conveyer System ◽  
Grain Model ◽  
Element Method

Large amount of particles are used in the industrial systems. Numerical analyses of these systems are expected to reduce designing cost. However the numerical analysis of powder is not used practically, because it requires high calculation cost which grows up with the number of particles. Besides, there are memory consumption problem which is required for calculation space. In this paper, the parallel simulation techniques of the Discrete Element Method (DEM) on multi-core processors are described. In the present study, it is shown that the algorithm enables all the processes of the DEM to be executed parallel. Moreover, a new algorithm which makes the memory space usage effectively and accelerates the calculation speed is proposed for multi-thread parallel computing of the DEM. In the present study, the memory space usage is shown to be reduced drastically by introducing this algorithm. In addition, the coarse grain model which emulates original particles with less calculation particles is applied in order to reduce calculation cost. For the practical usage of the DEM in industries, the simulation is performed in a large-scale powder system which possesses a complicated drive unit. In the current study, it is shown that the large scale DEM simulation of practical systems is enabled to be executed by our proposing algorithms.

Discrete element method (DEM) simulation and validation of a screw feeder system

2016 ◽  
Vol 287 ◽  
pp. 131-138 ◽  
Author(s):  
D. Kretz ◽  
S. Callau-Monje ◽  
M. Hitschler ◽  
A. Hien ◽  
M. Raedle ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Dem Simulation ◽  
Screw Feeder ◽  
Simulation And Validation ◽  
Element Method
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