Discrete Element Simulation of Conical Pick’s Coal Cutting Process under Different Cutting Parameters

Liu, Jinxia; Ma, Chao; Zeng, Qingliang; Gao, Kuidong

doi:10.1155/2018/7975141

Cited by 17 publications

(13 citation statements)

References 30 publications

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“…Moreover, it has been shown that the cutting forces and specific energy in unrelieved cutting mode have higher value than those in relieved cutting mode [3,[26][27][28]]. However, previous numerical studies [12,13,[20][21][22][23][24][25] introduced above have been performed for simple 2D analysis or unrelieved cutting mode of a single pick cutter. In these cases, therefore, the cutter forces and specific energy are not adequately evaluated or are overestimated.…”

Section: Figurementioning

confidence: 99%

“…In addition, in order to determine the mechanical properties of rocks, it is necessary to determine the micro-parameters of the particles through repetitive preliminary analysis. Nevertheless, previous studies have simulated the rock cutting process successfully using the DEM [21][22][23][24][25]. Labra et al [20] introduced an FEM-DEM coupled numerical model to simulate the rock cutting process with a disc cutter to reduce the computation time of the DEM.…”

Section: Introductionmentioning

confidence: 99%

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Rock Cutting Simulation of Point Attack Picks Using the Smooth Particle Hydrodynamics Technique and the Cumulative Damage Model

et al. 2020

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Various numerical methods have been used to simulate the rock cutting process. Numerical simulation is a useful tool for estimating the performance of a cutting tool and for understanding the mechanism of rock cutting and interaction between a cutting tool and the rock. These methods supplement the rock cutting test, which is commonly referred to as the linear cutting machine (LCM) test. Mechanical excavators, such as roadheaders, longwall shearers, and trenchers, generally use pick cutters as the cutting tool. In this study, a rock cutting simulation with a pick cutter was developed using the smooth particle hydrodynamics (SPH) technique, which is a mesh-free Lagrangian method. The Drucker–Prager (DP) strength model was used to simulate the brittle behavior of rock. The cumulative damage (CD) model was used to simulate the degraded fragmentation process of rock and the distinctive behavior of rock in the compression and tensile stress regions. In this study, an attempt was made to simulate sequential cutting by multiple pick cutters. The results showed that the numerical simulation matched the experimental results closely in terms of cutter forces, specific energy, and the fragmentation phenomenon. These results confirmed the applicability of the SPH technique in simulating the rock cutting process.

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Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rock Cutting Simulation of Point Attack Picks Using the Smooth Particle Hydrodynamics Technique and the Cumulative Damage Model

et al. 2020

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“…According to the theory of discrete elements [18,19], the coal wall model uses the Hertz-Mindlin bonding contact model. e bonding of particles 1 and 2 is achieved by the bond as shown in Figure 1; a certain bonding force must be existent between the coal particles by the bond.…”

Section: Discrete Element Theory Analysismentioning

confidence: 99%

Simulation of the Working Performance of a Shearer Cutting Coal Rock

Zhao

Liu

2019

Modelling and Simulation in Engineering

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Taking the MG2∗55/250-BWD shearer as the research object and considering the influence of the rock on the working performance of the shearer, the shearer-coal-rock coupled discrete element model was established and its dynamic working process has been studied. The single-factor analysis method was used to study the variation law of the cutting depth, traction speed, and the drum’s rotational speed on the three-way force acting on the drum, the coal loading rate, and the trajectory of the coal particles. The simulation showed that the coal loading rate fluctuated during the start-up phase of the shearer, and it was then constant as the time increased. The value of the cutting resistance was the largest, the traction resistance was the second largest, the axial force was the smallest, and the fluctuation coefficient of the axial force was the largest of all of them. The research showed that the coal loading rate of the drum decreased with the increase of the cutting depth, increased with the increase of the rotating speed of the drum, and decreased with the increase of the traction speed. The three-way force of the drum increased with the increase of the traction speed, decreased with the increase of the drum’s rotational speed, and increased with the increase of the cutting depth. According to the analysis of the coal cutting force and the coal loading rate, the drum could achieve high-efficiency cutting if the cutting depth, rotational speed, and traction speed of the dynamic were matched.

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“…The most suitable way to solve these problems is simulation. There are many publications that support this proposition [1] - [10]. There are also many publications about using simulation to solve problems for longwall coal mining [11] - [16].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Efficiency of Various Flow Charts of Longwall Coal Mining

Okolnishnikov

2020

Wseas Transactions on Environment and Development

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For increasing the efficiency of longwall coal mining a mathematical model and a simulation model of the longwall coal mining were developed. 2D and 3D visualizations of the execution of the simulation model were realized. The main goal of the modeling of coal mining in a fully-mechanized stoping face is the comparison of flow charts of Longwall coal mining, the evaluation of performance of a drum shearer depending on such factors as technical parameters of the drum shearer, size of a stoping face, flow charts of the drum shearer operation, changing geomechanical characteristics of the coal seam. As a result of simulation the dependences of the drum shearer performance and annual mine profits on the length of the stoping face and flow charts of the drum shearer operation such as one-way flow chart, shuttle flow chart and bench flow chart were obtained.

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Discrete Element Simulation of Conical Pick’s Coal Cutting Process under Different Cutting Parameters

Cited by 17 publications

References 30 publications

Rock Cutting Simulation of Point Attack Picks Using the Smooth Particle Hydrodynamics Technique and the Cumulative Damage Model

Rock Cutting Simulation of Point Attack Picks Using the Smooth Particle Hydrodynamics Technique and the Cumulative Damage Model

Simulation of the Working Performance of a Shearer Cutting Coal Rock

Comparison of the Efficiency of Various Flow Charts of Longwall Coal Mining

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