In order to obtain the parameters required for the simulated sowing process of Agriophyllum squarrosum seeds,the discrete element simulation parameters of Agriophyllum squarrosum seeds were calibrated by combining the physical stacking test and the simulation stacking test.Firstly,the relevant physical parameters of Agriophyllum squarrosum seeds were determined,their discrete element model was established,and the angle of repose of Agriophyllum squarrosum seeds was obtained to be 45.995° by using the physical stacking test.Secondly,the Plackett-Burman test was used to simulate the stacking test,and the parameters with significant effects on the angle of repose were screened out as:the recovery coefficient between Agriophyllum squarrosum seeds,the rolling friction coefficient between Agriophyllum squarrosum seeds,and the static friction coefficient between Agriophyllum squarrosum seeds and ABS.Then,the range of values of the significant parameters was determined based on the path of steepest ascent method;the quadratic orthogonal rotational combination test was designed to establish the second-order regression equation between the relative error of angle of repose and the significant parameters,and the optimal parameter combinations for the discrete element simulation were obtained:the recovery coefficient between Agriophyllum squarrosum seeds was 0.529,the rolling friction coefficient between Agriophyllum squarrosum seeds was 0.057,and the static friction coefficient between Agriophyllum squarrosum seeds and the ABS was 0.629.Finally,the value of the best parameter combination is verified by simulation stacking test,and the stacking angle of the simulation test is 46.740°,and the relative error with the physical stacking test is 1.62%,this indicates that the best parameter combination is reasonable,and it can provide a reference basis for the parameter setting and optimization design of Agriophyllum squarrosum seeding machinery.
关键词
沙蓬/离散元仿真/参数标定/堆积角/试验设计
Key words
Agriophyllum squarrosum/discrete element simulation/parameter calibration/angle of repose/experimental design
维普
万方数据