Test and Analysis on Friction Characteristics of Major Cotton Stalk Cultivars in Xinjiang

Zhang, Bingcheng; Liang, Rongqing; Li, Jiali; Li, Yaping; Meng, Hewei; Kan, Za

doi:10.3390/agriculture12070906

Cited by 8 publications

(6 citation statements)

References 19 publications

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“…The chain-clamping side of the clamping stress at the feeding point changes dramatically. The maximum clamping stress at the feeding point is about 305 MPa, which leads to a higher pull-off rate, and the clamping stress in the whole path of the movement except for the clamping point and tensioning point is only about 20 MPa, so there is not enough clamping stress to ensure a low leakage pull-off rate except for the feeding point and the tensioning point, which leads to a reduction in the pull-off rate [11]. From the viewpoint of clamping material, the flexible clamping method of belt clamping has a distributed force load compared with the rigid clamping of the chain plate, which is less destructive to the cotton straw, so the two-dimensional clamping force simulation shows that the belt-clamping side has a greater advantage over the chain-clamping side regarding cotton straw pulling.…”

Section: Clamping Trajectory Planningmentioning

confidence: 99%

Comparison and Experimental Study of Cotton Stalk Extraction via Nip Roller Based on Nip Motion Trajectory Equation

Wang,

Zhang,

Huo

et al. 2024

Agriculture

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In the field of straw recycling, a cotton straw-harvesting mechanism is an important piece of agricultural equipment. The mechanistic analysis method of the harvesting mechanism is a major focus of research and development in this field. Currently, in the mechanistic analysis of the cotton straw recycling mechanism, the kinematic and mechanical analysis of the recycling mechanism is generally the main focus. There is not a lot of research based on the quantitative analysis between different recycling mechanisms. In this study, a clamped cotton straw pulling mechanism is optimized and designed, and two different pulling structures are designed. In addition, a two-dimensional modeling and analysis method is used to establish the two-dimensional equations of motion of the two pulling mechanisms, analyze the leakage and breakage rates of the two clamping structures, predict the final pulling effect, and verify the results of the field tests. According to the analysis, the belt-clamping side has more uniform clamping stress and a larger clamping contact area than the chain-clamping side, and the tangential stress on cotton straw is smaller. Based on the field-test verification, the band-clamping side had a higher pulling net rate by an average of 19.32% and a lower missed pulling rate by an average of 6.01% than the chain-clamping side. Therefore, it was determined that the main reason for the lower pulling net rate of the chain-gripped side than that of the belt-gripped side was the higher pulling breakage rate, and the secondary reason was the high leakage pulling rate. Thus, the feasibility and accuracy of the analytical method of this study are verified.

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Section: Clamping Trajectory Planningmentioning

confidence: 99%

Comparison and Experimental Study of Cotton Stalk Extraction via Nip Roller Based on Nip Motion Trajectory Equation

Wang,

Zhang,

Huo

et al. 2024

Agriculture

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“…In the simulation test, the cotton stalk and cotton root particle parameters were set the same. According to the experimental measurements and references [12,[25][26][27]32,[41][42][43], the setting range of discrete element parameters in this paper is shown in Table 3.…”

Section: Establishment Of Particle Models and Setting Of Edem Parametersmentioning

confidence: 99%

Parameter Calibration of Discrete Element Model for Cotton Rootstalk–Soil Mixture at Harvest Stage in Xinjiang Cotton Field

Jiang,

Chen,

Yan

et al. 2023

Agriculture

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Due to the lack of accurate discrete element simulation model parameters in the design optimization process of key agricultural machinery components in the whole mechanization technology system of cotton generation, the optimization and improvement of the machine is restricted to a certain extent. Taking a cotton rootstalk–soil mixture at harvest stage in a Xinjiang cotton field as the research object, the discrete element simulation model of a cotton rootstalk–soil mixture was constructed, and the contact parameters of discrete element simulation were calibrated by combining simulation analysis with a physical test. The discrete element significant-influence parameters of cotton rootstalk–soil mixture were screened by Placket–Burman test, and the optimal range of significant-influence parameters was determined by the steepest climbing test. According to the principle of Box–Behnken test, the quadratic regression model of repose angle and significant parameters was established with repose angle as the response value. Taking the actual repose angle as the target, the Design-Expert software was used to optimize the parameters with significant influence and obtain the optimal combination of parameters. The optimal parameter combination was compared and verified by simulation experiments. The relative error between the simulated repose angle and the physical test was 2.36%. The results showed that the calibrated parameters were true and reliable, which could provide a theoretical reference for the discrete element simulation of cotton rootstalk–soil mixture in a Xinjiang cotton field.

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“…The static friction coefficient is the ratio of the maximum static friction force applied to an object to the positive pressure. The oblique plane sliding method is commonly used to measure the static friction coefficient [42,43]. The gravity of an object of mass, m, is decomposed into two forces: a force, F, parallel to the oblique plane and a force, T, perpendicular to the oblique plane.…”

Section: Static Friction Coefficientmentioning

confidence: 99%

Calibration and Test of Contact Parameters between Chopped Cotton Stalks Using Response Surface Methodology

et al. 2022

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The accuracy of the material parameter settings directly affects the reliability of the results of the discrete element method simulation. It is necessary to calibrate the relevant parameters to obtain accurate discrete element simulation results when separating the cotton stalk particles from the residual film after crushing. The repose angle of the chopped cotton stalk particles was used as the response value to calibrate the contact parameters between particles. Physical tests measured the intrinsic particle and contact parameters between the cotton stalk particles and the contact material, which provided data for the simulation tests. According to the biological structure characteristics of cotton stalk, the discrete element method model of cotton stalk particles was constructed by bonding the elements of nonequal-diameter basic particles. Based on the response surface methodology, the stacking test of particles was simulated. The response model between the contact parameters and repose angle was established, and the effect law of the single-factor terms and interaction terms on the repose angle was analyzed. The optimal combination of contact parameters was obtained through the single-objective and multi-variable optimization methods. Finally, the contact parameter combination was verified by a simulation test of the repose angle. The results showed that the average relative error of the repose angle between the simulation test and the physical test was 1.04%, which verified the accuracy of the calibrated contact parameters and the reliability of the simulation test. These parameters provide a basis for the discrete element simulation study of cotton stalk motion in the separation process of cotton stalks and residual film and the subsequent gas–solid coupling simulation research.

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Test and Analysis on Friction Characteristics of Major Cotton Stalk Cultivars in Xinjiang

Cited by 8 publications

References 19 publications

Comparison and Experimental Study of Cotton Stalk Extraction via Nip Roller Based on Nip Motion Trajectory Equation

Comparison and Experimental Study of Cotton Stalk Extraction via Nip Roller Based on Nip Motion Trajectory Equation

Parameter Calibration of Discrete Element Model for Cotton Rootstalk–Soil Mixture at Harvest Stage in Xinjiang Cotton Field

Calibration and Test of Contact Parameters between Chopped Cotton Stalks Using Response Surface Methodology

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