Study on the effects of blast damage factor and blast design parameters on the ground vibration using 3D discrete element method

2020 ◽  
Vol 5 (2) ◽  
Author(s):  
Bijan Afrasiabian ◽  
Kaveh Ahangari ◽  
Ali Noorzad
Keyword(s):  
Discrete Element Method ◽  
Ground Vibration ◽  
Discrete Element ◽  
Design Parameters ◽  
Damage Factor ◽  
Blast Design ◽  
Blast Damage ◽  
Element Method

scholarly journals ВПЛИВ КОНСТРУКЦІЙ ВІДЦЕНТРОВИХ ЗМІШУВАЧІВ НА ЇХ ЗГЛАДЖУВАЛЬНУ ЗДАТНІСТЬ

2020 ◽  
Vol 142 (1) ◽  
pp. 11-18
Author(s):  
В. В. Стаценко ◽  
О. П. Бурмістенков ◽  
Т. Я. Біла
Keyword(s):  
Discrete Element Method ◽  
Residence Time ◽  
Mixing Time ◽  
Discrete Element ◽  
Point Of View ◽  
Design Parameters ◽  
Discrete Elements ◽  
Bulk Materials ◽  
Design Features ◽  
Element Method

Studying the influence of continuous centrifugal mixers design features on their smoothing ability. The methods used are discrete elements, mathematical modeling and regression analysis. The paper considers five continuous centrifugal mixers designs with conical and parabolic rotors. The mixers design features are determined, allowing to change their smoothing ability. Mathematical models of the bulk materials particles movement inside each mixer have been developed based on the discrete element method. The considered mixers reaction to a step change of the key component amount is investigated. The transients parameters are calculated and the particles average residence time in the mixer is determined. It is established that the introduction of turbulizers in the mixers design increases the particles kinetic energy, which leads to a decrease in their residence time in the mixer. Moreover, the absence of a turbulizer leads to a decrease in the mixing intensity. It was also found that the most effective way to increase the mixer smoothing ability is the introduction of additional rotors. In terms of the technological and design parameters combination, the use of mixers with a conical rotor and a turbulizer is the most effective from the point of view for increasing the smoothing ability. On the discrete element method basis, the bulk materials particles movement models in continuous centrifugal mixers of five designs have been developed. The influence of the mixers design features on their smoothing ability and average mixing time is determined. The results obtained allow us to select the appropriate mixer design according to the specified requirements for smoothing ability.

scholarly journals Mechanical analysis and research of the conveyor belt of plane turning belt conveyor based on Discrete Element Method

2017 ◽  
Vol 41 (1) ◽  
pp. 55-62
Author(s):  
De-yong Li ◽  
Shuang Wang ◽  
Kun Hu
Keyword(s):  
Discrete Element Method ◽  
Inclination Angle ◽  
Turning Point ◽  
Elevation Angle ◽  
Load Condition ◽  
Discrete Element ◽  
Conveyor Belt ◽  
Design Parameters ◽  
Belt Conveyor ◽  
Element Method

In view of the size and the change of the load force of the conveyor belt at the turning point of the plane turning belt conveyor, the influencing factors of the stress of the conveyor belt at the turning point of the plane turning belt conveyor under full load condition are analyzed. A three dimensional model of the turning point of the plane turning belt conveyor is established. Combined with previous research experience, the formula for calculating the load is put forward. Based on discrete element method, multiple sets of internal curve elevation angle and the belt speed are used for dynamic simulation analysis. The results showed that the middle of conveyor belt is the most stressed, the lateral force second, the force of the inner conveyor belt is the least. Outside force increases with the increase of speed; there is no change in the middle band; the inner band force decreases with the increase of the velocity. Outside force decreases with the decrease of the inclination angle. With the change of the inclination angle, the force is basically unchanged. With the decreasing of the inclination angle, the force increases gradually. By optimizing the design parameters of the plane turning belt conveyor, the force of belt is reduced, and the service life of belt is improved.

Dynamics Model Research of Centrifugal Barrel Surface Finishing Based on 3D Discrete Element Method

2009 ◽  
Vol 416 ◽  
pp. 127-132 ◽  
Author(s):  
Chun Hua Song ◽  
Shi Chun Yang
Keyword(s):  
Discrete Element Method ◽  
Process Parameters ◽  
Production Efficiency ◽  
Discrete Element ◽  
Surface Finishing ◽  
Design Parameters ◽  
Dynamics Model ◽  
Fill Ratio ◽  
Abrasive Particles ◽  
Element Method

Dynamics model on abrasive particles and workpieces during the centrifugal barrel surface finishing process was built by Discrete Element Method (DEM). The motion status of abrasive particles and workpieces was visually simulated and some important process parameters were numerically studied. The influence of fill ratio on finishing efficiency was analyzed, and finishing efficiency was the highest as the fill ratio is 65%. the simulation results are basically coincident to the experimental results. Both results have proved that filling ratio is the main parameter that changes medium motion laws, which provides an very efficient way to further optimize design parameters and process parameters, as well as to improve production efficiency.

Simulation Analysis of Seed Metering Procedure in Scoop Metering Device Based on Discrete Element Method

2012 ◽  
Vol 157-158 ◽  
pp. 550-557 ◽  
Author(s):  
Yu Jie Ji ◽  
Hong Da Xue ◽  
Cheng Hua Li
Keyword(s):  
Discrete Element Method ◽  
Simulation Analysis ◽  
Discrete Element ◽  
Design Parameters ◽  
Structure Parameters ◽  
Key Factor ◽  
Seed Metering Device ◽  
Element Method

Seed metering procedure of metering device was a key factor to affect performance of precision seed metering device. Based on analysis of seed holding volume of metering scoop, relationship between the seed holding volume and structure parameters of the metering scoop was established, and beginning and ending angles of seed clearing during the seed metering procedure were determined. Simulation analysis of seed metering procedure with different parameters of the metering device was carried out by mean of discrete element method to identify the influences of metering scoop parameters on the performance the metering device, and suitable range of structure parameters of the metering scoop were investigated. Finally, the reasonability of design parameters of the metering scoop for experiment usage was verified.

Comprehensive performance analysis of a shearer drum in a complicated seam based on discrete element method

2021 ◽  
pp. 095440622110263
Author(s):  
Lijuan Zhao ◽  
Meichen Zhang ◽  
Baisheng Shi ◽  
Xionghao Liu ◽  
Yadong Wang
Keyword(s):  
Discrete Element Method ◽  
Loading Rate ◽  
Rotation Speed ◽  
Discrete Element ◽  
Design Parameters ◽  
Main Function ◽  
Cutting Depth ◽  
Lump Coal ◽  
Spiral Angle ◽  
Element Method

Drum of Shearer undertakes the main function of coal falling and loading, and its performance directly affects the working efficiency of the shearer. Therefore, in order to realize the analysis of the performance of the shearer drum, the MG2 × 55/250-BW shearer drum was the engineered object. Combining the physical and mechanical properties experiment results of coal samples, the coupling model of the drum cutting in complex coal seam was established using discrete element method. The falling-coal characteristics of the spiral drum were studied under different working conditions, and the falling-coal trajectories of the coal and rock particles were fitted. Based on a virtual prototype, the variations of the coal loading rate and lump coal rate with different design parameters were determined by studying the falling-coal effect and loading performance of the drum. Considering the drum performance, multi-objective optimization theory was used to determine the optimal operating and structural parameters. The results indicate that, in the process of drum cutting, the cutting depth has the most significant effect on the coal loading rate, while, the blade spiral angle has the least significant. Moreover, with the increase of the cutting depth of drum and the traction speed, the lump coal rate increases. While, with the increase of the drum rotation speed and the blade spiral angle, the lump coal rate decreases. It is found that when the cutting depth of the drum is 597 mm, the traction speed is 5.4 m/min, the drum rotation speed is 104.8 r/min, and the blade spiral angle is 12° the performance of the drum is optimal. Compared with the falling-coal trajectories before optimization, the displacements of the coal and rock particles ejected along the optimal falling-coal trajectories increase in the coal loading direction. The loading rate and lump coal rate of the drum increase by 6.05% and 12.27%, respectively. The load fluctuation of the drum decreases, and the productivity increases.

Computer Simulation on Centrifugal Barrel Surface Finishing Based on Discrete Element Method

2008 ◽  
Vol 53-54 ◽  
pp. 45-50
Author(s):  
C.H. Song ◽  
Shi Chun Yang ◽  
J.M. Wang ◽  
Y.Q. Zhang
Keyword(s):  
Discrete Element Method ◽  
Production Efficiency ◽  
Discrete Element ◽  
Contact Forces ◽  
Velocity Variation ◽  
Surface Finishing ◽  
Design Parameters ◽  
Abrasive Particles ◽  
Revolution Speed ◽  
Element Method

According to the motion features of abrasive particles and workpieces in centrifugal roller, considering the abrasive particles and workpieces as two kinds of ball particles with different materials and sizes, 3-Dimensional Discrete Element Method (DEM) was used to build the dynamics model of single abrasive particles and workpieces motion. Based on such model, in this paper, the influence of rotation-revolution ratio on medium movement was mainly analyzed. Supposing filling ratio as 20%, mixing ratio as 1.5:1 and revolution speed as 180r/min, the movement procedure of medium within centrifugal roller was respectively simulated under the different cases of rotation-revolution ratio as -0.13, -1 and -2, then the velocity variation diagram and the average contact forces diagram for abrasive particles or workpieces under different rotation-revolution ratio were obtained, the simulation results are basically coincident to the experimental results. Both results have proved that rotation-revolution ratio is the main parameter that changes medium motion law, which provides a very efficient way to further optimize design parameters and process parameters, as well as to improve production efficiency.

Discrete element method to model cracking for two layer systems

TAPPI Journal ◽  
2019 ◽  
Vol 18 (2) ◽  
pp. 101-108
Author(s):  
Daniel Varney ◽  
Douglas Bousfield
Keyword(s):  
Discrete Element Method ◽  
Flexural Modulus ◽  
Single Layer ◽  
Discrete Element ◽  
Flexural Stress ◽  
Layer System ◽  
Three Point Bending ◽  
Moving Force ◽  
Coating Layers ◽  
Element Method

Cracking at the fold is a serious issue for many grades of coated paper and coated board. Some recent work has suggested methods to minimize this problem by using two or more coating layers of different properties. A discrete element method (DEM) has been used to model deformation events for single layer coating systems such as in-plain and out-of-plain tension, three-point bending, and a novel moving force picking simulation, but nothing has been reported related to multiple coating layers. In this paper, a DEM model has been expanded to predict the three-point bending response of a two-layer system. The main factors evaluated include the use of different binder systems in each layer and the ratio of the bottom and top layer weights. As in the past, the properties of the binder and the binder concentration are input parameters. The model can predict crack formation that is a function of these two sets of factors. In addition, the model can predict the flexural modulus, the maximum flexural stress, and the strain-at-failure. The predictions are qualitatively compared with experimental results reported in the literature.

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