关键词: 锄板, 离散元法, 响应面分析法, 参数优化

Abstract: Aiming to solve the problem that the roots of stalk crops affect soil quality in the field,  the hoe plate of the root excavation equipment was taken as the research object,  and the JKR contact model was used to describe the movement of soil particles when they are in contact with each other. Based on the discrete element method,  the influence of the different speeds (forward speed),  the rotation speed of the hoe plate (the rotational angular velocity of the hoe plate around the turning point),  and the height from the ground (the distance of the knife tip from the ground) were analyzed by EDEM software. Using the maximum resultant force in the hoe plate rotation at 60° in the simulation,  the ternary quadratic linear mathematical model was established based on the BoxBehnken Design response surface analysis method,  which was obtained by ANOVA (P<0.01) that shows the rationality and correctness of the built mathematical model. The mathematical model determines that the speed of 0.41 m/s,  rotational speed of 40°/s,  and offground height of 115 mm, the maximum resultant force on the hoe plate can reach a minimum value of 563.36 N. A field test was carried out in the tobacco planting test plot. The field test results showed that the relative error of the measured force value and simulation force value is 5.1%,  verifying that the simulated soil model conforms to the soil mechanical characteristics and can simulate the soil properties of the test site. The study shows the feasibility of the method and that it can further provide a reference for the optimization design of hoe plates.

Key words: hoe plate, discrete element method, response surface analysis method, parameter optimization