Authors

Abstract

The lack of accurate simulation model parameters of cotton straw in the conveying process causes large differences between simulation effects and actual operation, which to a certain extent limits the development of conveying devices. In this paper, Xinjiang cotton straw was used as the test material. The angle of repose of cotton straw was measured by the cylinder lifting method. The Hertz-Mindlin no-slip model was applied to simulate the angle of repose of cotton straw. Using Box-Behnken optimization research and development of key components such as the cotton straw preparation test, the regression equation of cotton straw was obtained, and the variance and interaction effect of the regression model analysis. The regression model was used to find the optimal solution in Design-Expert software with the angle of repose of 28.62º, the collision recovery coefficient between cotton straws was 0.5, the static friction factor was 0.41, and the rolling friction factor was 0.06, and the collision recovery coefficient between cotton straw and steel was 0.5, the static friction factor was 0.37, and the rolling friction factor was 0.08, with an angle of repose error of 1.04%. It shows that the contact parameters are highly reliable and can be used to propose a theoretical reference for the development of cotton straw conveying device in Xinjiang region.

Abstract in Chinese

由于棉花秸秆在输送过程中缺乏准确的模拟模型参数，从而造成模拟效果与实际运行存在较大差异，这在一定程度上限制了输送装置的发展。本文以新疆棉花秸秆为试验材料，采用圆筒提升法测量棉花秸秆的堆积角。应用Hertz-Mindlin无滑动模型模拟棉秆的堆积角。利用Box-Behnken优化研究和开发棉秆制备试验等关键部件，得到了棉秆堆积角的回归方程，并分析了回归模型的方差和交互效应。利用回归模型在Design-Expert软件中找到最优方案，堆积角为28.62°，棉秆之间的碰撞恢复系数为0.5，静摩擦系数为0.41，滚动摩擦系数为0.06，棉秆与钢材之间的碰撞恢复系数为0. 5，静摩擦因数为0.37，滚动摩擦因数为0.08，静止角误差为1.04%,说明接触参数的可靠性很高，可以为新疆地区棉花秸秆输送装置的发展提出理论参考。