碟盘刀具破碎煤岩载荷谱的分形与FFT能量特征
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摘要
为评价碟盘刀具径向切削与轴向振动复合破碎煤岩的性能,应用分形理论和FFT能量方法分析碟盘刀具数值模拟的载荷谱。通过分析总载荷谱在2~(-8)尺度下的盒维数和FFT能量特征,研究碟盘刀具复合破碎煤岩的性能与碟盘刀具楔面角度的关系。结果表明:随着楔面角度增大,碟盘刀具径向载荷增大,轴向载荷减小,总载荷增大,其方向角变化范围减小并逐渐趋向0°,呈现非对称周期性。随楔面角度增大,碟盘刀具总载荷盒维数逐渐减小,比能耗减小,破碎煤岩块度增大,粉尘量减小,归一化的FFT能量减小。该研究揭示了不同楔面角度下碟盘刀具破碎煤岩的比能耗与分形特征评价破碎性能的一致性,为实现高效破碎煤岩提供了参考。
This paper is concerned with an evaluation of the performance of disc cutter in coal rock fragmentation by radial cutting and axial vibration. The study involves analyzing the load spectrum of disc cutter numerical simulation using fractal theory and FFT energy method; identifying the relationship between the performance of the disc cutter and the wedge angle of the disc cutter by providing the box dimension and FFT energy characteristics of the total load at the scale of 2~(-8). The results show that the increase of wedge angle is accompanied by an increase in the radial load of the disc cutter, a decrease in the axial load, an increase in the total load, and a decrease in the variation range of the direction angle, which gradually tends to 0 degrees, showing an asymmetric periodicity; along with the increase of wedge angle come a gradual decrease in he total load box dimension of disc cutter, a decrease in specific energy consumption, an increase in fragmentation of coal and rock, and a decrease in dust content and normalized FFT energy. This study reveals the consistency between the specific energy consumption of disc cutter and fractal characteristics in evaluating the crushing performance of coal and rock at different wedge angles, and could provide a reference for achieving efficient crushing of coal and rock.
This paper is concerned with an evaluation of the performance of disc cutter in coal rock fragmentation by radial cutting and axial vibration. The study involves analyzing the load spectrum of disc cutter numerical simulation using fractal theory and FFT energy method; identifying the relationship between the performance of the disc cutter and the wedge angle of the disc cutter by providing the box dimension and FFT energy characteristics of the total load at the scale of 2~(-8). The results show that the increase of wedge angle is accompanied by an increase in the radial load of the disc cutter, a decrease in the axial load, an increase in the total load, and a decrease in the variation range of the direction angle, which gradually tends to 0 degrees, showing an asymmetric periodicity; along with the increase of wedge angle come a gradual decrease in he total load box dimension of disc cutter, a decrease in specific energy consumption, an increase in fragmentation of coal and rock, and a decrease in dust content and normalized FFT energy. This study reveals the consistency between the specific energy consumption of disc cutter and fractal characteristics in evaluating the crushing performance of coal and rock at different wedge angles, and could provide a reference for achieving efficient crushing of coal and rock.
引文
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[14] 陈怀琛.数字信号处理教程[M].北京:电子工业出版社,2013.
[2] Tiryaki B,Cagatay D A.Effects of rock properties on specific cutting energy in linear cutting of sandstones by picks[J].Rock Mechanics and Rock Engineering,2006,39(2):89-120.
[3] Okan Su,Nuri Ali Akcin.Numerical simulation of rock cutting using the discrete element method[J].International Journal of Rock Mechanics & Mining Sciences,2011,48(3):434-442.
[4] 王春华,李贵轩,王琦.截齿截割的能耗与块度问题试验研究[J].辽宁工程技术大学学报,2002,21(2):238-239.
[5] 张艳林,闫炳雷,陈锷,等.基于ANSYS/LS-DYNA的掘进机截齿截割煤岩动力学分析[J].机械设计,2013,30(2):74-76.
[6] 江红祥,杜长龙,刘送永,等.基于断裂力学的岩石切削数值分析探讨[J].岩土力学,2013,34(4):1179-1184.
[7] 张倩倩,韩振南,张梦奇,等.截齿破岩机制及截线间距优化试验研究[J].岩土力学,2016,37(8):2172-2179.
[8] 郝志勇,周正啟,张佩,等.不同工况下采煤机滚筒载荷谱分形特征试验研究[J].煤炭科学技术,2018,46(7):171-177.
[9] 康晓敏,王伟超,陈应显.基于小波能量谱的刨煤机刨链动态张力信号分析[J].机械设计,2018,35(1):46-50.
[10] 刘春生,王庆华,李德根.镐型截齿截割阻力谱的分形特征与比能耗模型[J].煤炭学报,2015,40(11):2623-2628.
[11] 刘春生,袁昊,李德根,等.小波分解重构截齿载荷谱的幅值关联性与分形特征[J].煤炭科学技术,2018,46(5):149-218.
[12] 刘春生,袁昊,张艳军,等.不同楔面角度碟盘刀具切削煤岩的载荷与小波能量熵[J].黑龙江科技大学学报,2018,28(5):543-551.
[13] 朱华,姬翠翠.分形理论及其应用[M].北京:科学出版社,2013.
[14] 陈怀琛.数字信号处理教程[M].北京:电子工业出版社,2013.