Optimization and validation of blade parameters for inter-row weeding wheel in paddy fields

Zhang, Yongzheng; Tian, Liang; Cao, Chengmao; Zhu, Chengliang; Qin, Kuan; Ge, Jianli

doi:10.3389/fpls.2022.1003471

Cited by 8 publications

(8 citation statements)

References 30 publications

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“…As the dynamic blade install angle increases beyond 0 • , the dynamic blade shifts from its penetration into the soil to pressing into the soil, leading to an increase in the coupling stress. This observation aligns with the findings of Zhang et al [22].…”

Section: Results Of Simulation Testssupporting

confidence: 94%

“…Wang et al [21] designed a remotely controlled inter-row weeding machine capable of removing two rows of weeds in one pass, achieving a weeding rate of no less than 77.9%. Zhang et al [22], through simulation software, optimized the angle of the rake teeth based on the resistance it encountered and the velocity of the soil particles, resulting in a weeding rate of 88.2%. However, the inter-row weeding wheels used in these machines are passively rotating or electrically driven and rely on the weeding wheel tines to bury or pull out weeds.…”

Section: Introductionmentioning

confidence: 99%

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A Combined Paddy Field Inter-Row Weeding Wheel Based on Display Dynamics Simulation Increasing Weed Mortality

Wang,

Liu,

Yang

et al. 2024

Agriculture

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Weeds compete with rice for sunlight and nutrients and are prone to harboring pathogens, leading to reduced rice yields. Addressing the issues of low weeding efficiency and weed mortality rates in existing inter-row weeding devices, the study proposes the design of a combination paddy field inter-row weeding wheel. The device’s operation process is theoretically analyzed based on the weed control requirements in the northeastern region of China, leading to the determination of specific structural parameters. This research conducted experiments on the mechanical properties of weed cutting to obtain geometric parameters for paddy field weeds. It was found that the range for the cutting gap of the dynamic–fixed blade is between 0.6 mm to 1.4 mm and the cutting angle is between 5° to 15°, resulting in the lowest peak cutting force for weeds. Using LS-DYNA R12.0.0 dynamic simulation software, a fluid–structure interaction (FSI) model of the weeding wheel–water–soil system was established. By employing the central composite experimental design principle and considering the soil stir rate and coupling stress as indicators, the optimal structural parameter combination for the device is obtained: a dynamic–fixed blade cutting gap of 1.4 mm, a cutting angle of 10.95°, and a dynamic blade install angle of −3.44°. Field experiments demonstrated that the device achieved an average weeding rate of 89.7% and an average seedling damage rate of 1.9%, indicating excellent performance. This study contributes to improving weed mortality rates and provides valuable guidance for inter-row mechanical weeding technology.

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Section: Results Of Simulation Testssupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

A Combined Paddy Field Inter-Row Weeding Wheel Based on Display Dynamics Simulation Increasing Weed Mortality

Wang,

Liu,

Yang

et al. 2024

Agriculture

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“…Finally, the tea particles fall onto the pot groove' surface which entails collision movement. Ignoring the collision effect generated between tea particle and other particle, tea particle were treated as a single mass point, and a mathematical model of the motion characteristics of tea particle in air then established by following the principle of fluid dynamics; it was used to carry out a kinetic analysis of the motion process of tea particles (Zhang et al, 2022).…”

Section: Analysis Of the Movement Process Of Tea Particlesmentioning

confidence: 99%

Porous Hot Air Tea De-Enzyming and Carding Machine Under Gas–solid Coupling Conditions: Numerical Simulations and Performance Testing

BI,

JIA,

QIN

et al. 2023

INMATEH

Self Cite

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The gas–solid coupling of a porous hot-air tea de-enzyming and carding machine was studied by means of computational fluid dynamics and discrete element coupling. In the numerical model, the discrete phase of tea particles was simulated using Rocky-DEM software, while the gas phase was described by ANSYS Fluent software. A mathematical model of the movement characteristics of tea particles in air was established according to the principle of fluid mechanics, to carry out dynamic analysis of tea particles’ movement process and derive how the motion of gas and tea particles is governed. Three sets of prototype tests were carried out on the basis of the design and simulation, and the average of their results taken. This showed that the hourly output of the test prototype was 3.89 kg/h, the bar-type rate was 89.14%, the de-enzyming moderation rate was 91.67%, and the average value of the measured effective operating temperature of the pot slot was 189 °C. The performance of the prototype was also tested and analyzed. After conducting a tea sensory evaluation expert appraisal, the sensory evaluation indices of the prototype-processed tea satisfied all current market requirements, being superior to those of the conventional de-enzyming and carding machine. The quality of the finished tea also met the agronomic standards and the operational requirements of the de-enzyming and carding machine.

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“…Consequently, a series of studies on technical aspects and methods for utilizing paddy field machinery have been conducted by researchers [28][29][30][31][32][33][34][35][36][37]. Zhang, Y. et al [38] optimized the operational parameters of a weeder blade used in rice fields, and their results demonstrated that the optimized blade achieved satisfactory performance according to agronomic requirements. Zhu, D. et al [39] employed finite element and discrete element methods to develop a dynamic model for the coupled system of blade-straw-rice soil, with a focus on analyzing the operational processes of blades in paddy fields.…”

Section: Introductionmentioning

confidence: 99%

Simulation Analysis and Optimization Design of Paddy Field Mud Spreader Blades for Uniform Dispersion

Ren,

Chen,

Bao

et al. 2024

Agriculture

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To improve the distribution of mud particles collected in the tray during the operation of paddy field mud spreader blades, the optimal combination of parameters for the blades that results in the best uniformity of mud dispersion needs to be identified. In this study, a thorough force analysis was conducted on the spreading process, and computational equations were formulated to describe the motion of mud particles. By utilizing the discrete element simulation technique, a simulation model was developed to accurately represent the intricate interaction between the blades and mud particles. Through the single-factor simulation experiments, the ranges of key parameters such as the rotation radius, bending angle, sub-blade tilt angle, forward velocity, and rotational speed of the blade were determined. A secondary orthogonal rotational combination design was employed to establish a regression prediction model between the non-uniformity of mud dispersion and the key blade parameters. Subsequently, a multivariate single-objective optimization method was used to develop an optimization model for the non-uniformity of mud dispersion. The results indicate that the hierarchical order of factors influencing the non-uniformity of mud dispersion is as follows: rotation radius > rotation speed > bending angle > forward velocity > sub-blade tilt angle. To achieve a minimum spreading non-uniformity of 29.63%, a specific configuration is required, which includes a blade rotation radius of 188 mm, a bending angle of 121°, a sub-blade tilt angle of 30°, a forward velocity of 400 mm/s, and a rotation speed of 191 r/min. Finally, the accuracy of the optimization results was verified by means of bench tests. The research results provide a crucial reference for enhancing the uniformity of mud dispersion in paddy field mud spreader blades.

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Optimization and validation of blade parameters for inter-row weeding wheel in paddy fields

Cited by 8 publications

References 30 publications

A Combined Paddy Field Inter-Row Weeding Wheel Based on Display Dynamics Simulation Increasing Weed Mortality

A Combined Paddy Field Inter-Row Weeding Wheel Based on Display Dynamics Simulation Increasing Weed Mortality

Porous Hot Air Tea De-Enzyming and Carding Machine Under Gas–solid Coupling Conditions: Numerical Simulations and Performance Testing

Simulation Analysis and Optimization Design of Paddy Field Mud Spreader Blades for Uniform Dispersion

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