摘要
为更好地预测预报和治理煤岩动力灾害,以河南省义马煤业耿村矿煤样为研究对象,采用超声综合测试仪进行测试试验;并用ANSYS数值模拟方法研究超声波在煤样中的传播特性,重点分析煤样长度对超声波纵波首波幅值的影响。结果表明:同一超声波频率在一定煤样长度范围内,超声波幅值随煤样长度增加呈负指数关系变化,超过一定煤样长度后,超声波幅值无明显变化;超声波频率从20 k Hz增加到1 MHz时,超声波可靠检测距离从8.4 m减小到0.252 m。
In order to predict and control coal and rock dynamic disasters better,coal samples of Gengcun coal mine of Yima coal company in Henan province were studied by using an ultrasonic comprehensive test instrument for testing,and the propagation characteristics of ultrasonic wave in coal samples were studied by ANSYS numerical simulation method. The influence of the length of coal sample on the amplitude of ultrasonic longitudinal wave was examined emphatically. The results show that the amplitude of ultrasonic wave is negatively correlated with the coal sample length,at the same ultrasonic frequency in a certain coal sample length range. But outside the range,the coal sample length has no effect on the ultrasonic wave amplitude,that when the ultrasonic frequency increases from 20 k Hz to 1 MHz,the ultrasonic reliable detection distance will be shorted from 8.4 to 0.252 m.
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2017年第12期68-73,共6页
China Safety Science Journal
基金
国家自然科学基金资助(51574112
U1704129)
教育部创新团队发展计划项目(IRT_16R22)
河南省基础与前沿技术研究计划项目(142300413211)
河南省教育厅科技攻关重点项目(14A440011)
关键词
超声波
传播特性
检测距离
首波幅值
数值模拟
ultrasonic wave
propagation characteristics
detection distance
first wave amplitude
numerical simulation
