Calibration and Verification of Discrete Element Parameters of Jinxiang Purple Garlic Seeds
Aiming at the problem of lacking parameters in garlic seeding simulation test,this paper took Jinxiang purple garlic species as the research material,measured the physical property parameters of garlic and calibrated the discrete element simulation parameters.The density,water content,Poisson's ratio,shear modulus,static friction coefficient,rolling friction coefficient and collision recovery coefficient of garlic were determined by experimental method.Through Plackett-Burman test with several physical parameters of garlic as test factors and garlic accumulation angle as test index,the factors significantly affecting accumulation angle were selected as static friction coefficient and rolling friction coefficient between garlic plants.Then,the significant factors were optimized by CCD response surface test,and the physical test results were taken as the optimum values.The optimum static friction coefficient and rolling friction coefficient between garlic crops were 0.428 and 0.287,respectively.Taking rotational speed as the test factor and multi-grain rate as the test index,the simulation and bench comparative test verification of self-made chain scoop garlic planter device were carried out.The results showed that the average relative error between simulation and measured results was small,and the change curve was consistent,and the optimized and calibrated garlic simulation parameters had certain reliability,which could provide data support for garlic planter simulation test.
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