Calibration of discrete element model parameters: soybeans

Ghodki, Bhupendra M; Patel, Manish R.; Namdeo, Rohit; Carpenter, Gopal

doi:10.1007/s40571-018-0194-7

Cited by 68 publications

(40 citation statements)

References 31 publications

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“…e measured results of the mesocalibration test were close to the real contact parameter value [34]. However, due to the great difference in the shape and size of concrete particles, the testing method of contact parameters was still being further improved [16].…”

Section: Introductionmentioning

confidence: 58%

Simulation of Motion Behavior of Concrete in Pump Pipe by DEM

Hao

Jin

et al. 2021

Advances in Civil Engineering

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In this paper, the mesocalibration test was used to measure the contact parameters (restitution coefficient, rolling friction coefficient, static friction coefficient, and surface energy) between coarse aggregate particles and mortar particles in Discrete Element Method (DEM) model of concrete. Then, the DEM model of concrete slump was established according to the coarse aggregate gradation to study the flow behavior of coarse aggregate in fresh concrete. The slump test result was compared with the output of the slump DEM model with high consistent, indicating the promising reliability of the mesocalibration test. Finally, based on the mesocalibration test results, the DEM model of pumping concrete was established. It was obtained that the pumping pressure calculated by the numerical model was similar to that of the pumping test with satisfactory accuracy better than the concrete pumping pressure calculated according to the rheological test results of concrete and lubricating layer. On this basis, the movement trajectory of coarse aggregate in the pump pipe was analyzed and the influence of coarse aggregate on the pumping performance of concrete was revealed.

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Section: Introductionmentioning

confidence: 58%

Simulation of Motion Behavior of Concrete in Pump Pipe by DEM

Hao

Jin

et al. 2021

Advances in Civil Engineering

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“…The plate is inclined gradually until the fruits begin to slide down. The corresponding tilt angle of the plate was then recorded to deduce the coefficient of static friction between the lychee fruits and the plate (as the tangent of the tilt angle [43][44][45]). In addition, the measurement was replicated 20 times.…”

Section: Experiments Testing Lychees' Mechanical Friction Propertiesmentioning

confidence: 99%

Development and Identification of Working Parameters for a Lychee Peeling Machine Combining Rollers and a Pressing Belt

Nguyen

Pham

et al. 2019

AgriEngineering

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This work describes the development, design, and parameter identification of a lychee peeling machine. The working principle of the machine combines two rollers with a pressing belt to separate the peel from the fruits. It was designed and its operational parameters identified on the basis of experimental data on the Thieu lychee, which currently covers about 80% of the plantation area in Vietnam. To this end, the first step was to measure the physical characteristics of the fruits, such as size, shape, and density. Moreover, the coefficient of static friction between lychees and rubber rollers, and the critical peeling force, were identified, with a view to optimizing the operational parameters later on. Results showed that a minimum tangential force of 10.5 N is needed to break the peel and separate it from the pulp. Based on the balanced force principle, various optimal machine parameters such as roller rotation speed, roller diameter, roller length, gap size between the two rollers, belt velocity, and minimum pressure of the belt were calibrated. In addition, spiral grooves were created on the roller surface to facilitate the motion of the fruits. The optimal results were roller size 900 × 100 mm (length × diameter), rotation speed 159 RPM, gap size between rollers 4 mm, belt size 850 × 60 mm (length × width), belt pressure 13.5 N, and belt velocity 140 mm/s. Using the design and operational parameters mentioned above, the machine was able to perform regularly at a throughput of 100 kg/h, as demanded by the current market. Moreover, it would be easily feasible to combine multiple pairs of rollers and pressing belts in order to increase throughput. The methodology for the design of this peeling machine and identification of working parameters with respect to experimental data could be applied in many other post-harvesting configurations.

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“…In the case of DMA, each parameter is measured separately using known techniques. Most often, BCA and DMA are combined to achieve the most adequate bulk material behavior in the model [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Universal Approach for DEM Parameters Calibration of Bulk Materials

et al. 2021

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DEM parameters calibration is the most important step in preparing a DEM model. At the same time, the lack of a universal approach to DEM parameters calibration complicates this process. The paper presents the author’s approach to creating a universal calibration approach based on the physical meaning of the friction coefficients and conducting symmetrical experiments at full scale and in a simulation, as well as the implementation of the approach in the form of a physical test rig. Several experiments were carried out to determine the DEM parameters of six material–boundary pairs. The resulting parameters were adjusted using a refinement experiment. The results confirmed the adequacy of the developed approach, as well as its applicability in various conditions. The limitations of both the approach itself and its specific implementation in the form of a test rig were identified.

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Calibration of discrete element model parameters: soybeans

Cited by 68 publications

References 31 publications

Simulation of Motion Behavior of Concrete in Pump Pipe by DEM

Simulation of Motion Behavior of Concrete in Pump Pipe by DEM

Development and Identification of Working Parameters for a Lychee Peeling Machine Combining Rollers and a Pressing Belt

Universal Approach for DEM Parameters Calibration of Bulk Materials

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