Authors

Abstract

With the aim of revealing the effects of low temperature on the vibration impact comminution performance of wheat bran, the impact dynamic performance of wheat bran at different temperatures was simulated by using LS-DYNA. According to the impact collision relationship between grinding medium and wheat bran, a three-component numerical calculation model was established. The impact collision dynamic essence of the model was analyzed, and a solution method based on LS-DYNA was proposed. On this basis, the finite element model of the numerical calculation model was obtained. By adjusting the mechanical parameters of wheat bran in the finite element model, the vibration impact comminution performance of wheat bran at different temperatures were analyzed. It is found that the contact force, contact deformation and comminution energy of wheat bran increase with the decrease of temperature, which indicates that low-temperature comminution of wheat bran is more advantageous than room temperature comminution. However, when the temperature drops from - 40 ℃ to - 80 ℃, the above index parameters almost remain, which indicats that it is more economical to apply low-temperature comminution at the temperature range from - 40 ℃ ~ 0 ℃. This research provided a foundation for the analysis, prediction and optimization of vibration impact comminution performance of wheat bran.

Abstract in Chinese

为了揭示低温对小麦麸皮振动冲击粉碎性能的影响，利用LS-DYNA模拟分析了不同温度下小麦麸皮的冲击动力性能。根据振动球磨机的振动冲击粉碎机理，建立了三构件粉碎机理的数值计算模型，分析了模型的冲击碰撞动力学本质，提出了基于LS-DYNA的求解方法。在此基础上建立了粉碎机理数值计算模型的有限元模型。通过调整有限元模型中小麦麸皮的力学参数，比较分析了小麦麸皮在不同温度下的振动冲击粉碎性能。结果发现：随着温度的降低，小麦麸皮的接触力、接触变形和粉碎能量均得到了提高，表明小麦麸皮低温粉碎比室温粉碎更具优势。但当温度从-40℃下降到-80℃时，以上指标参数的变化较小，表明采用-40℃~0℃作为小麦麸皮低温粉碎的温度调节范围更为经济。上述研究为小麦麸皮低温振动粉碎性能的分析、预测和优化提供了基础和工具。