基于EDEM的玉米子粒建模方法的研究

Research of discrete element modeling method of maize kernel based on EDEM

以玉米子粒为研究对象,通过三维光栅扫描技术获取其真实外形轮廓,将其作为几何体导入到EDEM软件中,采用半径为0.5 mm的球颗粒自动填充满几何体后,根据球颗粒坐标数据对离散元模型API文件进行修改,在EDEM软件中重新导入该API文件即可自动生成玉米籽粒三维离散元模型。采用无底圆筒法在EDEM软件中对玉米子粒扫描自动填充模型和常规方法手动填充模型进行堆积角的离散元模拟试验,并与实际玉米子粒堆积角试验进行对比分析。结果表明,自动填充模型和手动填充模型所得堆积角与实际试验结果误差分别为4.45%和17.54%,证明了扫描自动填充模型更接近真实的玉米子粒,仿真精度更高。

This paper focused on maize kernel,and its profile model scanned by AICON-Breuckmann Smartscan scanner was imported into the software EDEM as the geometrical body.After the geometrical body was filled with 0.5 mm radius spherical particles,the API file of discrete element model was modified based on the coordinate data of spherical particles.The maize kernel 3D discrete element model was created automatically when the API file was re-imported into the software EDEM.The repose angle simulation tests were conducted by bottomless cylinder for two models using the software EDEM,model 1 filled automatically based on scanning and model 2 filled manually based on conventional method,and were compared with the real maize kernel repose angle test.The results indicate that the error between the two model simulation test results and the actual test was 4.45%and 17.54%,respectively which demonstrated that the model filled automatically based on scanning could better fit the actual maize kernel,with higher accuracy.