Discrete Element Simulation Analysis of Mechanical Behavior of the Gas Hydrate-Bearing Sediments

2018 ◽  
Vol 07 (03) ◽  
pp. 85-94 ◽  
Author(s):  
宏乾 王
Keyword(s):  
Mechanical Behavior ◽  
Gas Hydrate ◽  
Simulation Analysis ◽  
Discrete Element ◽  
Discrete Element Simulation ◽  
Element Simulation ◽  
Hydrate Bearing Sediments

scholarly journals Design and Simulation of a Garlic Seed Metering Mechanism

Agriculture ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1239
Author(s):  
Huiping Guo ◽  
Yazhou Cao ◽  
Wenyuan Song ◽  
Jiao Zhang ◽  
Changlin Wang ◽  
...  
Keyword(s):  
Simulation Analysis ◽  
Discrete Element ◽  
Discrete Element Simulation ◽  
Simulation Test ◽  
Single Seed ◽  
Element Simulation ◽  
Unit Speed ◽  
Optimal Adjustment ◽  
Seed Metering Device ◽  
Qualification Rate

According to the agronomic requirements of garlic sowing, the garlic morphology is studied and a garlic seed metering mechanism with excellent seeding performance is designed. Based on this design, a new garlic seeding machine with an adjustable-size seeding device is developed to realize efficient single-seed metering and seeding of different varieties of garlic. Further, the design scheme of the garlic seeder prototype is established, with the key components of the garlic seeding being designed on the basis of the garlic seeding mechanism. To achieve garlic single-seed metering for different varieties of garlic, the optimal adjustment size of the garlic seed metering device is determined through discrete element simulation analysis. A field experiment confirms the effectiveness of applying the proposed garlic planter to field sowing in terms of the metrics of missing seed and multiple seed rates. The results of the discrete element simulation test reveal that an adjustment size of 40 mm yields the best single-seed metering performance. At an operating speed of 15–35 rpm, the metering device can achieve more than an 80% qualification rate of single-seed metering, with a unit speed of 0.628–1.465 m/s. Thus, the developed garlic seeding device meets the requirements of precision sowing in China and can effectively realize the mechanized planting of garlic.

scholarly journals Discrete Element Simulation Analysis of Vibratory Cleaning Device

2018 ◽  
Vol 439 ◽  
pp. 052004
Author(s):  
Lingran Ma ◽  
Shukun Cao ◽  
Heng Wang ◽  
Yi Cui ◽  
Zijian Cao ◽  
...  
Keyword(s):  
Simulation Analysis ◽  
Discrete Element ◽  
Discrete Element Simulation ◽  
Element Simulation ◽  
Cleaning Device

scholarly journals Research on Simulation Analysis Method of Microbial Cemented Sand Based on Discrete Element Method

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Yang Tang ◽  
Guobin Xu ◽  
Jijian Lian ◽  
Yue Yan ◽  
Dengfeng Fu ◽  
...  
Keyword(s):  
Simulation Analysis ◽  
Moment Tensor ◽  
Simulation Method ◽  
Discrete Element ◽  
Particle Flow Code ◽  
Discrete Element Simulation ◽  
Cemented Sand ◽  
Physical Experiments ◽  
Element Simulation ◽  
Probability Of Fracture

A simulation method for microbial cemented sand (MCS) based on the Two-Dimensional Particle Flow Code (PFC 2D) has been developed in this study. It consists of an identification of mesoscopic contact model for structural mesoscopic particles, development of morphological algorithm for irregular crystal particles, and classification and setting of mesoscopic parameters for compositional materials and particle size distribution simulation. Additionally, an acoustic emission algorithm based on moment tensor theory was developed for discrete element simulation analysis on fracture characteristic of cemented sand under the action of the force. The simulation method proposed in this article/paper may reflect the physical and mechanical characteristics of real microbial cemented sand based on physical experiments. Quantification of the fracture process of microbial cemented sand is possible by introducing a moment magnitude (MW) in discrete element simulation analysis. The material may have greater probability of fracture between the MW ranges of −6.8 and −6.6. The relationship between probability of fracture at different MWs and the MW follows the Gaussian curve. The research results are a new trial for fracture analysis on microbial cemented sand.

Screw Conveyor Design and Discrete Element Simulation Analysis of the Rice Mill

2014 ◽  
Vol 644-650 ◽  
pp. 689-692
Author(s):  
Yan Hua Shi ◽  
Guo Quan Zhang ◽  
Ning Zhang ◽  
Zhi Ping Huang
Keyword(s):  
Structural Design ◽  
Simulation Analysis ◽  
Discrete Element ◽  
Screw Conveyor ◽  
Discrete Element Simulation ◽  
Element Analysis ◽  
Element Simulation ◽  
Overall Stability ◽  
Important Field ◽  
Important Basis

During the rice mill structural design process, static analysis is an extremely important field, not only decide to what the structure size is, but also for the subsequent fatigue analysis, providing the basis for the overall stability analysis. In this paper, vertical screw conveyor vertical rice mill, rice discrete element analysis simulation under different speed, the internal movement of materials to simulate the process for improving the productivity of the vertical screw conveyor has a certain significance. Providing an important basis for further design optimization of the rice mill structure.

scholarly journals Simulation analysis and experiment of sampling process of wheel brush sampler based on discrete element method

2021 ◽  
Vol 2137 (1) ◽  
pp. 012058
Author(s):  
Qiming Wei ◽  
Ran Liu ◽  
Hua Zhang ◽  
Xingyuan Wu ◽  
Haitao Luo
Keyword(s):  
Optimization Design ◽  
Simulation Analysis ◽  
Discrete Element ◽  
Test System ◽  
Simulation Software ◽  
Discrete Element Simulation ◽  
Structure Selection ◽  
Sampling Process ◽  
Element Simulation ◽  
Driving Torque

Abstract In order to study the brush sweep sampling process through simulation analysis, the structure of the asteroid sampler is simplified on the basis of retaining the wheel brush. Soybean particles are selected as the verification sampling particles, and the physical and contact parameters of calibrated soybean particles are applied to the discrete element simulation software EDEM and the relationship between the sampling wheel brush speed and torque is analysed. At the same time, a set of wheel brush asteroid sampler ground torque test system is built to verify the accuracy of the discrete element simulation results. The results show that the driving torque of the sampling wheel brush is mutational in the process of sampling, and the faster the rotation speed of the sampling wheel brush, the more the mass of the collected particles, and the greater the driving torque required for the sampling wheel brush. This research provides a method basis for the structure selection and parameter optimization design of the asteroid sampler.

scholarly journals Discrete Element Simulation Analysis of Damage and Failure of Hydrate-Bearing Sediments

2021 ◽  
Author(s):  
Mingxin Zhao ◽  
Huaishan Liu ◽  
Qing Ma ◽  
Lei Xing ◽  
Qiuping Xia ◽  
...  
Keyword(s):  
Discrete Element ◽  
Loose Sand ◽  
Discrete Element Simulation ◽  
Fracture Characteristics ◽  
Damage And Failure ◽  
Element Simulation ◽  
Sand Body ◽  
Hydrate Saturation ◽  
Hydrate Bearing Sediments ◽  
Initiation Stress

Abstract It is of great significance to study the damage and failure law of hydrate-bearing sediments for for exploration and development, as well as for warning secondary disasters such as tsunami and earthquake. The discrete element modeling and simulation method has the advantages of low cost, strong repeatability and accurate response to the microstructure of samples, therefore , the discrete element method is used to simulate and analyze the damage and failure law of hydrate-bearing sediments in this paper. First, a triaxial undrained shear teat model of hydrate-bearing sediments is established. by discrete element simulation software; Then, the effects of different influencing factors on the fracture characteristics of hydrate hydrate-bearing sediments is studied; Finally, the effects of different factors on the initiation stress and damage stress of hydrate sediments are analyzed, and the damage law of hydrate-bearing sediments is obtained. The results show that: (1) The cementation of hydrate particles is greater than its bearing effect, thus the lithology of sediments changes from loose sand body to brittle rock with the increase of hydrate saturation, resulting in the corresponding change of fracture characteristics from loose sand body failure to brittle rock failure. (2) With the increase of hydrate saturation, the initiation stress of sediment shows a step-by-step increase law, and the damage stress is positively correlated with the shear modulus. (3) The heterogeneity of hydrate distribution is closely related to the failure mode of sediments. With the increase of hydrate distribution heterogeneity, the initiation stress displays an increase-decrease-increase pattern while the damage stress shows a law of increasing and then decreasing, which has the high sensitivity to heterogeneity of hydrate distribution. The research results have certain theoretical reference significance for the exploitation practice of natural gas hydrate.

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