基于小波正则化重构镐型截齿载荷谱的时频特性

Time-frequency characteristics of reconstruction load spectrum of conical picks based on wavelet regularization

为探寻镐型截齿旋转破碎煤岩载荷时频谱特性规律,研究其载荷谱能量分布特征与截割过程的映射关系,以期实现截割破碎煤岩载荷谱的定量重构。利用小波正则化方法建立截齿旋转破碎煤岩载荷谱重构模型,确定不同频段其载荷谱能量特征分布。结果表明:实验载荷谱能量随旋转破碎循环次数的增加呈先增大后减小变化,其能量特征可表征截齿破碎过程,重构载荷谱能量主要分布在低频段,在高频段其能量幅值较小,重构与实验载荷谱能量差值变化率在15%以内。该研究可以为实现高效旋转破碎煤岩判定方法提供参考。

This paper seeks to investigate the law underlying the time spectrum characteristics behind conical picks working with coal-rocks by rotating and crushing, determine the mapping relationship be- tween the distribution characteristics of load spectrum energy and cutting process, realize the quantitative reconstruction of the load spectrum of the picks cutting coal rocks, and reconstruct the experimental load spectrum The study consists of producing the experimental load spectrum of the picks working with coal rocks by rotating and breaking operation, and analyzing the time spectrum characteristics; using the wavelet regularization method to establish the load spectrum reconstruction model. The results show that experimental load spectrum energy sees a change from an initial increase to a subsequent decrease, de- pending on the increase in the numbers of rotating crusing cycles, exhibiting energy characteristics able to characterize the crushing process; indicating a difference of less than 15% between the reconstruction and the experimental load spectrum energy. The study may sever as the reference for the realization of high ef- ficiency rotary broken coal rock judgment method.