水稻籽粒流对承载板冲击过程离散元分析

为了提高谷物流量测量精度,基于软球模型的离散元法,采用Hertz-Mindlin(无滑移)接触力学模型模拟水稻籽粒流与承载板冲击过程,在升运器线速度分别为0.5、1.0、1.5m/s时分析水稻质量与平均法向冲击力变化规律。结果表明:水稻籽粒流对承载板冲击过程的离散元模型参数选用合理,具有工程应用价值;去除水稻籽粒在承载板上的滑落阶段,3种线速度下水稻质量与平均法向力的线性相关系数由0.8062,0.9082,0.9891分别增大到0.9144,0.9630,0.9944。在设计冲量式谷物质量流量测量装置时应考虑如何减少谷物在测量装置上的滑落阶段,从而提高测量精度。为谷物流量测量装置的开发提供技术支持。

Discrete element method analysis of impact action between rice particles and impact-board

Contacts model of Hertz-Mindlin (no slip) based on discrete element method of soft-sphere was used to simulate the impact action between the rice particles flow and the impact-board in order to improve the measurement accuracy of grain flow. The relationship of rice mass and mean normal impact force was analyzed when the line velocity of elevator was 0.5, 1.0 and 1.5 m/s. The results showed that simulation parameters of discrete element method which used between rice particles and impact-board were reasonable, and it had great practical value; The Linear correlation increased from 0.8062, 0.9082, 0.9891 to 0.9144, 0.9630, 0.9944 at three velocities respectively when the sliding stages removed. Therefore, we should consider how to reduce the sliding stages to improve the measurement accuracy when designed the measurement device of grain flow. This article can provide technical support for the research and development of grain mass flow device.