Parameter determination of a viscoelastic–plastic contact model for potatoes during transient collisions

Liang, Zhenwei; Huang, Yin; Li, Depeng; Wada, Million Eyasu

doi:10.1016/j.biosystemseng.2023.09.003

Cited by 7 publications

(2 citation statements)

References 39 publications

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“…Likewise, Xie et al (2020) used an acceleration acquisition system to identify the hierarchy of factors influencing collision damage volume in potatoes and the varying relationships between collision acceleration and damage area for different factors. Moreover, Liang et al (2023) ascertained the equivalent Young's modulus of two distinct potato cultivars, Dutch 15 and Gansu, employing quasistatic loading tests. Employing impact data (force, displacement, and displacement rate) procured from the oscillation device, a contact force model delineating the viscoelastic plastic characteristics of the potato was formulated with precision, ensuring validation of the novel model's functionality.…”

Section: Introductionmentioning

confidence: 99%

Construction and parameter calibration of potato double‐layer flexible bonding model based on discrete‐element method

Gai,

Xie,

Deng

et al. 2024

J Food Process Engineering

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The current discrete‐element simulation models for potatoes are multisphere polymer models derived from the Hertz–Mindlin (no slip) contact model in the discrete‐element simulation software (EDEM). These models oversimplify by considering potato peel and flesh as sharing identical mechanical properties within the structure. This oversimplification impedes a thorough investigation of the characteristics and mechanisms underlying potato peel‐breaking damage during mechanized harvesting, making in‐depth exploration challenging through simulation experiments. Consequently, this study conducted laboratory tests to determine the water content of potato peel and flesh, as well as the friction coefficients and collision recovery coefficients for various material pairs: flesh–steel, peel–steel, peel–peel, peel–flesh, and flesh–flesh. Subsequently, based on these findings, a double‐layer flexible bonding model for potato samples and whole stems under specific water content conditions was developed using EDEM software. The bonding parameters of the double‐layer flexible model for potato samples were refined through virtual shear calibration tests, leading to the identification of the optimal parameter combination: Flesh particle–flesh particle normal stiffness(tangential stiffness) per unit area X1 = 4.39 × 108 N/m3, peel particle–flesh particle normal stiffness(shear stiffness) per unit area X3 = 1.81 × 109 N/m3, peel particle–peel particle shear stiffness per unit area X6 = 1.99 × 109 N/m3, peel particle–peel particle critical normal stress X7 = 2.06 × 109 Pa. To validate the accuracy of the bonding parameters, shear and compression validation tests were conducted on entire potato stems. Comparison of the validation results from laboratory tests and simulation tests revealed an average relative error of e = 3.25%, signifying the feasibility of the constructed double‐layer flexible bond model for potatoes. This model meets the requirements for studying the characteristics and mechanisms of peel‐breaking damage in potatoes.Practical ApplicationsThe paper introduces a novel double‐layer flexible bonding model for potatoes using the discrete‐element method (DEM), which accurately simulates the mechanical properties and damage characteristics of potato peels and flesh. This research has significant practical applications in agricultural machinery design, improving the efficiency and reducing the damage during mechanical harvesting. By providing a more realistic simulation of potato behavior under mechanical stress, it can guide the development of gentler handling equipment, reduce waste, and enhance the quality of harvested potatoes. This contributes to optimizing the post‐harvest process, ensuring better storage, and extending the marketable life of potatoes.

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Section: Introductionmentioning

confidence: 99%

Construction and parameter calibration of potato double‐layer flexible bonding model based on discrete‐element method

Gai,

Xie,

Deng

et al. 2024

J Food Process Engineering

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“…For instance, [11] investigated the collision damage mechanism between rice and threshing elements, while [12] explored the surface-squeezing mechanical properties and impact damage testing of Purple Cloud English Seeds. The study [13] delved into the damage mechanisms of potatoes and poles during transportation. These studies employed the Hertz contact theory to analyze the collision damage mechanism between agricultural materials and harvesting components.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Collision Damage Mechanisms and Reduction Methods for Pod Pepper

Wang,

He,

Han

et al. 2024

Agriculture

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This study aims to address the current situation of the late start of mechanized harvesting technology for the pod pepper, the high damage rate of existing pod pepper harvesters, and the lack of theoretical support for key harvesting components. The Hertz theory is employed to investigate the damage mechanism of collisions between pod pepper and comb fingers. The study analyzes the maximum deformation of pod pepper and the critical speed at which damage occurs during the collision process. Furthermore, it explores the critical relative speed that leads to damage in pod pepper. Orthogonal tests are conducted to analyze the effects of rotational speed, hose thickness, and moisture content on the efficiency of pod pepper picking. The experimental results are then subjected to multifactorial ANOVA to identify the optimal test parameters. The structural and motion parameters of the picking device are optimized based on these conditions. It is determined that the critical relative velocity for damage to pod pepper during a collision with the comb finger is V0 = 11.487 m s−1. The collision velocities of pod pepper with different hose thicknesses are analyzed using the i-SPEED TR endoscopic high-speed dynamic analysis system to obtain the corresponding collision velocities for different hose thicknesses. The study finds that rotational speed, hose thickness, and the water content of pod pepper affect the damage rate and stem shedding rate. The optimal experimental parameters are determined to be a rotational speed of 705.04 rpm, hose thickness of 3 mm, and water content of the pepper of 71.27%.

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Assessment of apple bruise resistance under transient collisions through X-ray computed tomography and image processing

Huang,

Liang

2024

Biosystems Engineering

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Parameter determination of a viscoelastic–plastic contact model for potatoes during transient collisions

Cited by 7 publications

References 39 publications

Construction and parameter calibration of potato double‐layer flexible bonding model based on discrete‐element method

Construction and parameter calibration of potato double‐layer flexible bonding model based on discrete‐element method

Investigation of Collision Damage Mechanisms and Reduction Methods for Pod Pepper

Assessment of apple bruise resistance under transient collisions through X-ray computed tomography and image processing

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