内充式排种器工作过程和性能的离散元法仿真分析

摘要

为建立一种排种器设计的新方法,以内充式排种器和小麦种子为研究对象,由排种器的CAD (computer aideddesign,计算机辅助设计)模型建立了该排种器的二维离散元法分析模型,采用圆弧组合的方法建立了小麦种子的二维颗粒模型,采用自主研制的二维离散元法软件,分析了该排种器的工作过程及性能.同时将排种器台架试验结果与离散元法分析结果进行了比较,两者基本一致,初步证明采用离散元法分析内充式排种器工作过程和性能的可行性,为内充式排种器的研究和优化设计建立了一种新方法.%In this paper, an inside-filling seed metering device and the wheat seed were researched by using the discrete element method. The two-dimensional discrete element method analytical model of a seed metering device was established based on its CAD model, and the two-dimensional particle model of a wheat seed was built using the method of combination of different circular arcs. The behaviors of wheat seeds and the performance of the seed metering device were simulated and analyzed using self-developed two-dimensional discrete element method software. By comparing the simulation results with the experimental results, good agreements were obtained. The results showed the feasibility of using discrete element method to analyze the performance of an inside-filling seed metering device, which can be a new method for the research and optimal design of inside-filling seed metering device.