Lateral stress and its transmission law caused by operation of a double-wing subsoiler in sandy loam soil

Qin, Kuan; Zhao, Yun; Zhang, Yongzheng; Cao, Chengmao; Shen, Zhougao

doi:10.3389/fenvs.2022.986361

Cited by 5 publications

(1 citation statement)

References 39 publications

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“…According to Equations (12)(13)(14)(15)(16), the acceleration of tea particles moving in the pot is influenced by the average velocity of airflow (ua), the initial velocity (uv) of tea particles, and the angle θ between the gravity of tea itself and the direction of the gravitational component of tea particles. Due to the action of airflow forces F1 and F2, the tea particles' acceleration when moving along the inner wall of the pot groove increases significantly, which causes them to bounce around when moving along the pot groove .…”

Section: Fig 4 -Force Analysis Diagrams Of Tea-particle Throwing and ...mentioning

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

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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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Section: Fig 4 -Force Analysis Diagrams Of Tea-particle Throwing and ...mentioning

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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Optimization Design and Experiment of High-Speed Drag-Reducing Trencher Based on Conservation Tillage

Zhang,

Liu,

et al. 2023

Actuators

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In the realm of high-speed precision broadcasting, the existing seeder opener proves inadequate for the speed of the seeding operation. We focus on the duckbill opener and employ the quadratic regression orthogonal rotation combination test design method to optimize the structural parameters of the opener. Throughout the experiment, the primary performance metrics encompassed the opener’s working resistance and the side dumping distance. The selected experimental factors comprised the penetration angle, the angle of soil entry gap, the shovel body width, and the shovel length. The optimal arrangement of structural parameters has been determined: a penetration angle, a soil entry gap angle, a shovel body width of 21 mm, and a shovel length of 142 mm. These parameters contribute to increased velocity, reduced operational resistance, and minimal soil disturbance. Under this combination, the relative deviations between the recorded measurements and the theoretical outcomes for working resistance and the side dumping distance stand at 4.24% and 1.06%, respectively; these confirm the credibility of the optimization results. We performed adaptability testing and conducted a comparative analysis under various operational conditions to assess the innovative opener’s ability to reduce force, minimize soil disruption, and maintain depth stability. The findings are as follows: At a depth of 5 cm and velocities ranging from 6 km/h to 8 km/h, an average working resistance reduction of 19.73%, a 5.64% decrease in the side dumping distance, and an average depth stability of 89.5% were observed. When operated at a speed of 7 km/h with a depth ranging from 3 cm to 5 cm, an average reduction of 19.66% in operational resistance, a 2.59% decrease in the side dumping distance, and an average depth stability of 91.1% were recorded. These results illustrate the innovative opener’s capacity to significantly reduce working resistance and side dumping distance while satisfying the depth stability requisites.

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Investigating the Coupling Effect of High Pressure and Hot Air on External Friction Angle Based on Resistance Reduction Tests on Subsoiling Tillage Tools for Sandy Clay Loam

et al. 2022

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Sandy clay loam has the characteristics of both sand and clay. Because of these characteristics, both frictional resistance and adhesive resistance occur between the soil and tillage tool. The combined effect of the two frictional forces increases the external friction angle between the soil and tillage tool, thus increasing the working resistance. To address this issue, this study investigated the coupling effect of high pressure and hot air on the external friction angle by using a self-developed device to measure the external friction angle. Test results showed that high-pressure air between the soil and tillage tool formed a high-pressure air curtain layer which acted as a lubricant, thereby reducing the external friction angle. The external friction angle decreased as the airflow pressure increased. The reduction in the moisture content of the subsoil to less than 30% by the high-pressure hot air reduced the resistance between the soil and tillage tool. The approach with the high-pressure hot air curtain was verified in tests on a subsoiling shovel; the working resistance of the shovel under high-pressure hot air was reduced by 14.8%, demonstrating that this approach was effective in reducing the working resistance of the shovel.

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Lateral stress and its transmission law caused by operation of a double-wing subsoiler in sandy loam soil

Cited by 5 publications

References 39 publications

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

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

Optimization Design and Experiment of High-Speed Drag-Reducing Trencher Based on Conservation Tillage

Investigating the Coupling Effect of High Pressure and Hot Air on External Friction Angle Based on Resistance Reduction Tests on Subsoiling Tillage Tools for Sandy Clay Loam

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