煤块冲击破碎粒度的分形特征

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (3) : 18-21.

论文

煤块冲击破碎粒度的分形特征

刘瑜1，周甲伟1，杜长龙2

作者信息 +

Fractal character for impact crushing granularity of lump coa

LIU Yu 1 ZHOU Jiawei 1 DU Changlong 2

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文章历史 +

摘要

煤块冲击破碎后的粒度分布具有分形特征，根据分形理论建立了煤块冲击破碎粒度的分形模型，对不同矿区的煤块进行冲击破碎试验。在不同试验条件下对冲击破碎后煤块的筛下质量累积概率进行函数拟合，拟合结果表明分形模型能够很好地描述煤块冲击破碎后的粒度分布特征，粒度分形维数是评价煤块冲击破碎效果的重要参数。采用Matlab软件建立了粒度分形维数与试验参数之间的二次方模型，该模型的预测结果与试验结果的平均误差为2.51%，满足预测误差要求，为控制煤块冲击破碎后的产品粒度分布提供了理论依据。

Abstract

The impact-crushing granularity distribution of lump coal possess a fractal character. A fractal model for impact crushing granularity of lump coal was proposed based on fractal theory. The impact crushing experiments of lump coal in different mines were carried out. The cumulative weight percentage undersize of crushed lump coal under different experimental conditions were fitted. The fitting curves show that the fractal model is suitable for the granularity distribution of crushed lump coal, and the granularity fractal dimension is a important parameter for the evaluation of impact crushing effect for lump coal. A quadratic model between the granularity fractal dimension and experimental variables was established used the Matlab software. The average error between the predicted results and experimental results was 2.51 percent and meet the requirement of the prediction error, which provided a theoretical foundation for controlling the granularity distribution of crushed lump coal.

导出引用

刘瑜;周甲伟;杜长龙. 煤块冲击破碎粒度的分形特征[J]. 振动与冲击, 2013, 32(3): 18-21

LIU Yu ZHOU Jiawei DU Changlong . Fractal character for impact crushing granularity of lump coa[J]. Journal of Vibration and Shock, 2013, 32(3): 18-21