成熟期艾草茎秆离散元仿真模型参数标定与试验

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中图分类号：S225.99 文献标识码：A 文章编号：2095-5553（2025）10-0249-11

Abstract：Inorder toaddressthe lack of accurate models for simulating keyoperational processes，such as mechanized harvesting，defolition and chopping，of Artemisia argyi using the discrete element method（DEM），this study adopted a combinationof physical experimentsand simulationanalyses.Maturefresh Artemisiaargyi stalkswereusedas the researchobject．The physicaland bonding parametersof the stalks werecalibratedusing the Hertz—Mindlin（no slip） modeland Hertz—Mindlinwithbondingmodel withintheEDEMsimulationsoftware.Todeterminethecontact and bonding parameters of the Artemisiaargyi stalk，a sries of experimental designs was employed，including the PlackettBurman test，the stepestclimb test，andthe Central—Composite design.Theaccuracy ofthecalibrated parameters was verified through astacking angle bench testanda sheartestconductedonthe stalks.Theresults showedthatthecolision recoverycoefcient，staticfrictioncoefcient，andkineticfrictioncoefficentbetweenArtemisiaargyi stalkswereO.13， 1.09 and O.O26 respectively. Between the stalks and operating equipment，the corresponding values were O.43，O.73 and 0.0156respectively.Thenormal contact stifess，tangentialcontact stifess，critical normal stress，andcritical tangential stress of the stalks were 3.91×109N/m ， 2.43×109N/m ！ 4.35×106 Pa and 6.14×106 Pa，respectively.The relative errors for the stacking angle and shear tests were 0.96% and 2.89% respectively，indicating high accuracy. The discrete element model and thecalibrated simulation parametersofthe Artemisiaargyi stalksproved tobebothaccurate andreliable，efectivelycapturing theirphysicaland mechanicalcharacteristics.Thesefindings providearobustreference for future DEM-based simulation studies involving Artemisia argyi.

Keywords：Artemisia argyi stalks；discrete element method;parametercalibration; stacking angle；test verification

0 引言

艾草（Artemisiaargyi）为菊科蒿属多年生草本或略成半灌木状植物，是一种药食同源叶片类中药材1]，以其叶片入药，具有抗菌、消炎、止血等功效[2。（剩余16500字）