摘要
为了对综放面几何形状相对复杂的大型机电设备及其组件进行精准探伤,基于综放支架进行无损检测的必要性,提出一维线性超声相控阵无损检测技术。以ZFG10000/23/37H型综放支架活柱探伤为依据,研究了相控聚焦和相控延时接收的基本原理,并结合单一阵元的归一化声压函数,分析正弦增益加权变迹技术在降低旁瓣对输出波形清晰度影响方面的重要意义。最后以五家沟煤矿5201综放面焊缝开裂的掩护梁探伤为实践,阐述超声相控阵无损检测技术的构成和检测工艺。实例应用表明:一维线性超声相控阵无损探伤技术能够对掩护梁内部微裂隙和表面贯通裂隙进行精准的定位和定量,并能够根据三维图像输出结果准确判定裂隙的发展方向和贯通趋势。
Based on the necessity of nondestructive testing of hydraulic supports in top coal caving face,the nondestructive testing technology of one-dimensional ultrasonic phased array was proposed in this paper,to accurately inspect the large-scale electromechanical equipment and its components with relatively complex geometric figures.According to the mobile column detection of ZFG10000/23/37H hydraulic supports,the basic principles of phase-controlled focus and phase delay was conducted.Combined with the normalized acoustic pressure function of single element,the significance of sine gain weighted apodization technology was analyzed when applied into reducing the definition of output waveform influenced by sidelobe.Finally,in view of the detection of weld cracking shields at 5201 working face in Wujiagou coalmine,the composition and testing process of nondestructive detection were illuminated.The application examples indicate that the internal micro-fractures and surface interpenetrated fractures of shields can be accurately quantified and located by nondestructive testing technology of one-dimensional ultrasonic phased array,and the development direction and interpenetrated tendency of the fractures can be also exactly judged,according to the results of three-dimensional imaging output.
出处
《采矿与安全工程学报》
EI
北大核心
2012年第3期328-333,共6页
Journal of Mining & Safety Engineering
基金
国家重点基础研究发展计划(973)项目(2010CB226802)
煤炭资源与安全开采国家重点实验室自主研究课题项目(SKLCRSM10B08)
中央高校基本科研业务费专项资金项目(2010YZ02)
关键词
超声相控阵
相控延时
动态变迹
相位量化误差
ultrasonic phased array
phase delay
dynamic apodization
phase quantification error
