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parameter calibration and experimental verification of discrete element simulation model for Protaetia brevitarsis larvae bioconversion mixture

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International Journal of Agricultural and Biological Engineering 2024年第4期17卷 35-44页

作者： Yuanze Li Jianhua Xie Jia Zhang Yong Yue Qinghe Meng Yakun Du Deying Ma College of Mechanical and Electrical Engineering Xinjiang Agricultural UniversityUrumqi 830052China Key Laboratory of Xinjiang Intelligent Agricultural Equipment Xinjiang Agricultural UniversityUrumqi 830052China

To improve the survival rate of larvae during material separation after biotransformation of existing residual film mixtures of Protaetia brevitarsis larvae,this paper adopts the method of combining physical test and EDEM simulation test,and selects Hertz Mindlin with JKR contact model to calibrate the discrete element simulation contact parameters of the Protaetia brevitarsis larvae and the frass ***,the cylinder lifting method was used to determine the actual repose angle of the mixture of larvae and *** collision recovery coefficients between larvae-frass and steel,static friction coefficient,kinetic friction coefficient and the collision recovery coefficient between larvae were measured through physical tests such as the inclined plane *** Plackett-Burman test was then used to screen out the factors that have a significant impact on the repose angle:Poisson’s ratio of frass,frass-frass rolling friction coefficient,frass JKR surface energy,frass-larvae JKR surface *** optimal value intervals of four significant factors were determined based on the steepest climb test,Based on the Box-Behnken response surface analysis test,the second-order regression model between the repose angle and four significant factors was determined,and variance and interaction effects were *** with the actual repose angle as the goal,the significant factors were optimized and the optimal parameter combination of the four significant factors was *** simulation test of material repose angle and screening was carried out with the optimal parameter combination,and compared with the physical *** was found that the maximum relative errors of the two tests were 1.48%and 3.79%respectively,indicating that the calibrated parameter values are true and reliable,It can provide a reference for the discrete element simulation of the transportation and separation of the Protaetia brevitarsis larvae-frass mixture.

关键词： Protaetia brevitarsis larvae-frass mixture repose angle parameter calibration discrete element model

parameter calibration of American ginseng seeds for discrete element simulation

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International Journal of Agricultural and Biological Engineering 2022年第6期15卷 16-22页

作者： Wenxin Zhang Fangyan Wang College of Mechanical and Electrical Engineering Qingdao Agricultural UniversityQingdao 266109ShandongChina

The accurate contact parameters of American ginseng seed particles are the basis for establishing the discrete element simulation model of American ginseng *** parameters of American ginseng seeds were calibrated by combining the physical tests and simulation tests *** basic physical parameters,contact parameters and repose angle of sprouted American ginseng seeds were determined by physical *** simulation parameters were significantly screened by conducting the Plackett-Burman ***,it was determined that the collision recovery coefficient,static friction coefficient and rolling friction coefficient of interspecific contact parameters have significant influences on the repose angle of the simulation *** the steepest climb test,the optimal interval for the value of the significance parameter was ***,the second-order regression equation between contact parameters and the repose angle was established,the regression equation was optimized and solved,and the best combination of simulation parameters was *** collision recovery coefficient between sprouted American ginseng seeds was 0.346,the static friction coefficient was 0.769,and the rolling friction coefficient was *** the calibrated seed group of American ginseng for discrete element simulation test,the average repose value angle was 38.80°,and the relative error with the measured repose angle was 0.733%.The results revealed that the simulation parameters of American ginseng seeds were reliable,which can provide a basis for the design and performance optimization of American ginseng seed-metering device in the later stage.

关键词： American ginseng seed parameter calibration discrete element experiments

parameter calibration of discrete element model for alfalfa seeds based on EDEM simulation experiments

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International Journal of Agricultural and Biological Engineering 2024年第3期17卷 33-38页

作者： Xinjiu Zhang Hongti Wang Fangyan Wang Zhengguo Lian College of Mechanical and Electrical Engineering Qingdao Agricultural UniversityQingdao 266109ShandongChina

In order to establish an accurate discrete element model of alfalfa seeds,real physical experiments were combined with simulation experiments,and the contact parameters of alfalfa seeds were calibrated using the repose angle of alfalfa seeds as the response *** intrinsic parameters(thousand grain weight,triaxial size,density)and contact parameters(static friction coefficient,rolling friction coefficient)of alfalfa seeds were obtained through physical experiments,and a spherical particle model was *** the Plackett Burman experiment,the static friction coefficient between alfalfa seeds,the rolling friction coefficient between alfalfa seeds,and the static friction coefficient between alfalfa seeds and ABS plastic were determined to have a significant impact on the *** steepest climb test is used to narrow down the selection range of the optimal parameters,and the box Behnken test is used to obtain the quadratic regression equation of the repose *** optimal parameter combination was obtained with the objective of minimizing the repose angle error:the static friction coefficient between alfalfa seeds and alfalfa seeds was 0.418,the rolling friction coefficient between alfalfa seeds and alfalfa seeds was 0.086,and the static friction coefficient between alfalfa seeds and ABS plastic was *** repose angle and mass flow rate experiments show that the model is effective and reliable.

关键词： alfalfa seeds discrete element parameter calibration EDEM

parameter calibration of the tensile-shear interactive damage constitutive model for sandstone failure

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1153-1174页

作者： Yun Shu Zheming Zhu Meng Wang Weiting Gao Fei Wang Duanying Wan Yuntao Wang MOE Key Laboratory of Deep Earth Science and Engineering College of Architecture and EnvironmentSichuan UniversityChengdu610065China Failure Mechanics and Engineering Disaster Prevention Key Laboratory of Sichuan ProvinceSichuan UniversityChengdu610065China Tianfu Engineering-oriented Numerical Simulation & Software Innovation Center Chengdu620107China

The tensile-shear interactive damage(TSID)model is a novel and powerful constitutive model for rock-like *** study proposes a methodology to calibrate the TSID model parameters to simulate *** basic parameters of sandstone are determined through a series of static and dynamic tests,including uniaxial compression,Brazilian disc,triaxial compression under varying confining pressures,hydrostatic compression,and dynamic compression and tensile tests with a split Hopkinson pressure *** on the sandstone test results from this study and previous research,a step-by-step procedure for parameter calibration is outlined,which accounts for the categories of the strength surface,equation of state(EOS),strain rate effect,and *** calibrated parameters are verified through numerical tests that correspond to the experimental loading *** between numerical results and experimental data indicates the precision and reliability of the calibrated *** methodology presented in this study is scientifically sound,straightforward,and essential for improving the TSID ***,it has the potential to contribute to other rock constitutive models,particularly new user-defined models.

关键词： Damage constitutive model parameter calibration Rock modeling Sandstone Dynamic impact load Tensile-shear interactive damage(TSID)model

Discrete element modeling and parameter calibration of safflower biomechanical properties

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International Journal of Agricultural and Biological Engineering 2024年第2期17卷 37-46页

作者： Zhenguo Zhang Chao Zeng Zhenyu Xing Peng Xu Quanfeng Guo Ruimeng Shi Yunze Wang College of Mechanical and Electrical Engineering Xinjiang Agricultural UniversityUrumqi 830052China Key Laboratory of Xinjiang Intelligent Agricultural Equipment Xinjiang Agricultural UniversityUrumqi 830052China

Understanding the biomechanical properties of safflowers is essential for appropriately designing harvesting machinery and optimizing the harvesting *** is a flexible crop that lacks a basis for relevant simulation parameters,which causes difficulties in designing harvesting *** this study,a calibration method for safflowers was ***,a discrete element model was established by measuring the intrinsic parameters of a safflower,such as its geometric parameters,density,Poisson’s ratio,and modulus of ***,the contact and bonding parameters were calibrated using a combination of physical and simulation *** the contact parameter tests,the Hertz-Mindlin(no-slip)model was implemented for the stacking angle tests conducted regarding the safflower filament.A regular two-level factorial design was used to determine the important factors and perform the steepest climb ***,the Box-Behnken design was adopted to obtain the optimal contact *** the bonding parameter tests,the Hertz-Mindlin model with bonding contact was applied for the safflower shear simulation tests;moreover,the optimum bonding parameters were obtained through the central composite design *** results demonstrated that the relative errors between the simulated and measured stacking angles and maximum shear were 3.19%and 5.29%,*** a result,the safflower simulation parameters were accurately calibrated,providing a reference for appropriately setting the simulation parameters and designing key mechanical components.

关键词： safflower DEM parameter calibration shear test biomechanical properties

Comparison of Parallel Genetic Algorithm and Particle Swarm Optimization for parameter calibration in Hydrological Simulation

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Data Intelligence 2023年第4期5卷 904-922页

作者： Xinyu Zhang Yang Li Genshen Chu University of Science and Technology Beijing Beijing 100083China Engineering Research Center of Intelligent Supercomputing Beijing100083

parameter calibration is an important part of hydrological simulation and affects the final simulation *** this paper,we introduce heuristic optimization algorithms,genetic algorithm(GA)to cope with the complexity of the parameter calibration problem,and use particle swarm optimization algorithm(PsO)as a *** large-scale hydrological simulations,we use a multilevel parallel parameter calibration framework to make full use of processor resources,and accelerate the process of solving high-dimensional parameter ***,we test and apply the experiments on domestic *** results of parameter calibration with GA and PSO can basically reach the ideal value of 0.65 and above,with PSO achieving a speedup of 58.52 on TianHe-2 *** experimental results indicate that using a parallel implementation on multicore CPUs makes high-dimensional parameter calibration in large-scale hydrological simulation ***,our comparison of the two algorithms shows that the GA obtains better calibration results,and the PSO has a more pronounced acceleration effect.

关键词： Hydrologic simulation parameter calibration Genetic algorithm Particle swarm optimization

Contact parameter analysis and calibration in discrete element simulation of rice straw

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International Journal of Agricultural and Biological Engineering 2021年第4期14卷 72-81页

作者： Honglei Jia Jiayu Deng Yanling Deng Tianyou Chen Gang Wang Zaijin Sun Hui Guo College of Biological and Agricultural Engineering Jilin UniversityChangchun 130022China Technical Center for Soil Agricultural and Rural Ecology and EnvironmentMinistry of Ecology and Environment of the People’s Republic ChinaBeijing 100012China College of Mechanical Engineering Harbin Institute of PetroleumHarbin 150028China

Discrete element method was used to study and analyze the interaction between rice straws and between rice straw and agricultural machinery parts,thereby providing a scientific basis for post-harvest paddy field *** of rice straw-rice straw,rice straw-agricultural machinery part contact parameters(collision recovery coefficient,static friction coefficient and rolling friction coefficient)constitute an important prerequisite for the discrete element research *** this study,the collision recovery coefficients of rice straw-steel and rice straw-rice straw were 0.230 and 0.357,respectively,which were calibrated by the collision *** static friction coefficient and rolling friction coefficient of rice straw-steel were 0.363 and 0.208 respectively,which were calibrated by the inclined plate method and the slope *** static friction coefficient and rolling friction coefficient of rice straw-rice straw were 0.44 and 0.07,respectively,which were calibrated by the split cylinder *** paired t-test showed insignificant differences between calibration parameter simulation results and the physical test values(p>0.05).Taking the angle of repose that reflecting rice straw flow and friction characteristics as the evaluation index,the verification tests of the above calibration values indicated that the simulated angle of repose has no significant difference from the physical test value(p>0.05).The side plate lifting test on rice straw of different lengths showed no significant difference between the simulated angle of repose and the physical test value(p>0.05).This study can provide a basis for contact parameters choice in discrete element simulation analysis with rice straw-rice straw and rice straw-agricultural machinery parts as the research *** calibration method can provide a reference for the contact parameter calibration of other crop straws.

关键词： rice straw discrete element simulation contact parameter parameter calibration angle of repose

Data-based parameter calibration Method of the Computed Tomography System

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Data-based Parameter Calibration Method of the Computed Tomo...

Simulation of rice grain breakage process based on Tavares UFRJ model

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作者： Zhang Ruikun Shan Zhengduo Duan Deyu Xu Guangwei Zhang Xinli School of Mathematics and Physics Qingdao University of Science and Technology Big Data Research Center of School of Mathematics and Physics Qingdao University of Science and Technology Center for Mathematical Modeling Research Qingdao University of Science and Technology

This paper mainly studies data-based parameter calibration of the computed tomography（CT） system. By establishing a least squares algorithm model, CT system parameters were calibrated. First, the attenuation coefficient is calculated from the known data, and the relationship between the received information and the pitch of the X-ray transmission template is obtained by using the Lambert-beers principle. Then, by using the geometric relationship between the ray and the two-dimensional graph, the relationship model between the pitch and the variable to be sought is established. On this basis, we can get the multivariate linear equations which present the received information and the variables to be solved. Finally, the least square method is used to establish the target programming model which is based on the minimum square sum of the fitting value and the actual value of the received information. By using the genetic algorithm, the multiple linear equations are solved. Meanwhile, the deflection center and receiver unit spacing can be obtained.

关键词： parameter calibration Data-based CT system Least Square Method Genetic Algorithm

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Particuology 2024年第10期93卷 65-74页

作者： Shaohang Shen Shouyu Ji Dan Zhao Yanlong Han Hao Li Ze Sun Zhuozhuang Li Anqi Li Wenyu Feng Jiaming Fei Fuguo Jia Yang Li College of Engineering Northeast Agricultural UniversityHarbin150030China School of Water Conservancy and Civil Engineering Northeast Agricultural UniversityHarbin150030China College of Food Science Northeast Agricultural UniversityHarbin150030China

Understanding the breakage characteristics of rice grains is an important means to reduce rice breakage rate. However, the dynamic breakage mechanism of rice grain is unclear due to the lack of a reasonable breakage model. In this study, the uniaxial compression test and drop weight test of single rice were carried out, the breakage model of rice grain was constructed, the reliability of rice model was verified by the experiment and simulation results. The results showed that the fracture energy distribution of rice can be obtained by uniaxial compression test, the specific fracture energy of rice accords with a lognormal distribution, and the median specific fracture energy of rice is 479.75 J/kg. The damage accumulation coefficient and fragment size distribution of rice can be acquired by drop test, the result of damage accumulation coefficient of rice was 4.3. Rice grain breakage mainly occurs in the milling section of the vertical circulation rice mill.

关键词： Rice breakage mechanism Discrete element method parameter calibration