An Experimental Study of Axial Poisson’s Ratio and Axial Young’s Modulus Determination of Potato Stems Using Image Processing

Fan, Jiali; Li, Yuyao; Wang, Bing; Wu, Feng; Yang, Hongguang; Yu, Zou; Hu, Zhichao

doi:10.3390/agriculture12071026

Cited by 3 publications

(2 citation statements)

References 23 publications

(21 reference statements)

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“…Intrinsic parameters and contact mechanical parameters are necessary for discrete element simulation, including Young's modulus and Poisson's ratio (Fan et al 2022), which were collected by the universal material tester (Instron 5944, Bingyang Technology, China). The Young's moduli of RRS and RHB were 30 and 140 MPa, respectively; the Poisson's ratios were 0.3 and 0.4, respectively.…”

Section: Parameters Determinationmentioning

confidence: 99%

Parameter calibration for simulation of Gentiana seedling substrate based on discrete element method

Cui

Chen

et al. 2023

BioRes

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The physical and mechanical parameters of the rotten rice straw (RRS), rice husk biochar (RHB), and the mixture of the two materials (the substrate) were calibrated by Plackett-Burman and Box-Behnken experiments to obtain the parameters for simulation of the forming of the Gentiana seedling substrate mat (GSSM). The particle contact parameters were calibrated, and the repose angle was taken as the response value based on the Hertz-Mindlin approach with the JKR contact model of discrete element method (DEM). A quadratic regression model was established and optimized using Design-Expert software. The parameters that most affected the substrate repose angle were the restitution coefficient of RRS of 0.20, the rolling friction coefficient of RRS of 0.04, the surface energy of RRS for JKR of 0.53, and the surface energy of RHB-RRS for JKR of 2.11. The simulated repose angle of the substrate and the bending strength of GSSM were compared with that of the verified experimental values respectively based on the optimal parameters. The relative errors of repose angles and bending strengths between the values of the simulation and the measurement were 0.71% and 1.39% respectively, indicating that the parameters obtained in this study can provide a reliable reference for the forming of GSSM.

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Section: Parameters Determinationmentioning

confidence: 99%

Parameter calibration for simulation of Gentiana seedling substrate based on discrete element method

Cui

Chen

et al. 2023

BioRes

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“…The curtain dimensional parameters were obtained from the optimal parameters obtained from the bench test. Material parameter settings are shown in Table 2 [26][27][28]. The model for the stem and curtain were imported in Abaqus, and a frequency analysis step and a substructure analysis step were created, with the output form selected as Admas.…”

Section: Factors Selection and Experimental Protocol Designmentioning

confidence: 99%

An Experimental Study of Stem Transported-Posture Adjustment Mechanism in Potato Harvesting

Fan

Wei-wen

et al. 2023

Agronomy

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Potato stem removal is one of the critical technical problems of potato mechanized harvesting; it directly affects the quality of potato harvesting and potato storage. There have been several studies on potato stem removal mechanisms. In practice, however, it was found that the potato stem removal rate was greatly influenced by the posture of the stem before it entered the removal mechanism. In this study, we designed a potato stem posture adjustment mechanism consisting of elastic curtains. A test rig was built to investigate the effect of curtain height, curtain width, and curtain suspension height on potato passage rate and potato stem removal rate. The Box–Behnken design (BBD), combined with the response surface method, was used to conduct the test. The optimal construction and installation parameters for each elastic curtain were determined as 278.93 mm for the curtain height, 20 mm for the curtain width, and 260 mm for the curtain suspension height. The predicted values of potato passage rate and potato stem removal rate under the optimal parameters were 92.36% and 82.83%, which were consistent with the validation test results. Based on the optimization results, a rigid-flexible coupled simulation model for a potato stem transported-posture adjustment process based on Abaqus and Adams was constructed. The maximum impact of the elastic curtain of the stem posture adjustment mechanism on the potato stem was 15.91 N and caused the stem to spring back. The projection angle β′ of the stem posture angle in the xoz plane before posture adjustment was 19.07°, and the β′ of the stem after posture adjustment was 87.18°. At this time, the stem was basically parallel to the rod of the separating sieve and had a high probability of falling from the gap of the bar to complete the removal of the stem. Overall, the stem transport position adjustment mechanism effectively adjusted the stem transported posture and improved the stem removal rate in potato mechanical harvesting.

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Design and Test of Discrete Element-Based Separation Roller Potato–Soil Separation Device

Du,

Liu,

Zhao

et al. 2024

Agriculture

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To address the problems of low bright rates and high rates of potato injuries, a left and right-hand rotation combination of potato–soil separation devices was developed. Its overall structure and working principle were introduced. A Texture Analyzer and pressure sensor were used to measure the force threshold of different varieties of potatoes. A discrete element model of separation rollers and potatoes was established. The collision characteristics of potatoes were analyzed using the device inclination angle, rotational speed, and the center distance of the separation rollers as test factors. A field trial was carried out to optimize the best combination of factors by taking the rate of injured potatoes, bright potatoes, and skin-breaking rate as the test indexes. The force threshold for skin-breaking injury in potatoes was found to be 190–195 N. When the inclination angle of the device was 6°, the rotation speed of the separation roller was 100 r/min, and the distance between the centers of the separation rollers was 79 mm. The rate of injury was 1.25%, the rate of bright potatoes was 99.01%, and the rate of skin-breaking was 1.58%. When the inclination angle of the device was 8°, the rotational speed of the separating roller was 80 r/min, and the center distance of the separating roller was 79 mm, the rate of injured potato was 1.43%, the rate of bright potato was 98.64%, and the rate of broken skin was 1.77%. This paper offers an optimized reference for the effectual removal of sticky soil.

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An Experimental Study of Axial Poisson’s Ratio and Axial Young’s Modulus Determination of Potato Stems Using Image Processing

Cited by 3 publications

References 23 publications

Parameter calibration for simulation of Gentiana seedling substrate based on discrete element method

Parameter calibration for simulation of Gentiana seedling substrate based on discrete element method

An Experimental Study of Stem Transported-Posture Adjustment Mechanism in Potato Harvesting

Design and Test of Discrete Element-Based Separation Roller Potato–Soil Separation Device

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