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

Bingcheng Zhang, Xuegeng Chen, Rongqing Liang, Xinzhong Wang, Hewei Meng () and Za Kan
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Bingcheng Zhang: College of Mechanical and Electrical Engineering, Shihezi University, Shihezi 832000, China
Xuegeng Chen: College of Mechanical and Electrical Engineering, Shihezi University, Shihezi 832000, China
Rongqing Liang: College of Mechanical and Electrical Engineering, Shihezi University, Shihezi 832000, China
Xinzhong Wang: School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China
Hewei Meng: College of Mechanical and Electrical Engineering, Shihezi University, Shihezi 832000, China
Za Kan: College of Mechanical and Electrical Engineering, Shihezi University, Shihezi 832000, China

Agriculture, 2022, vol. 12, issue 11, 1-17

Abstract: 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.

Keywords: discrete element method; cotton stalk particles; contact parameters; calibration; response surface methodology (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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