摘要
针对液压缸长期在重载和交变载荷下运行,极易产生各种疲劳损伤,严重时引起缸体焊缝开裂,甚至引发爆缸的问题,对液压支架缸体焊缝检测方法进行了研究。由于焊缝表面不平整,声波垂直入射耦合效果差,将换能器安装在楔块上使得声波斜入射对焊缝进行检测。根据射线声学理论和Snell原理,确定超声波在楔块和工件中的传播路径,得到了楔块条件下超声相控阵延时法则计算公式。对楔块条件下单阵元空间脉冲响应进行延时叠加,得到了超声相控阵的空间声压模型,仿真得到了不同偏转角度时的声轴线声压,分析了在不同偏转角度下超声相控阵换能器辐射声场的特性。对含人工缺陷的焊缝试块进行相控阵实验,能发现不同位置的缺陷,对ZY9200/25/50D型液压支架缸体环焊缝进行现场检测,从相控阵图像上可以直接得到缺陷的位置和尺寸,通过声场仿真可为制定相控阵检测工艺参数提供指导。
Hydraulic cylinder operates under heavy and alternating load,which is very easy to produce fatigue damage.With the expansion of fatigue damage,fatigue strength gradually deteriorates,and even lead to weld cracking and exploding,affecting the supporting characteristics and causing safety hazards.The surface of weld is uneven,and it is difficult to detect by straight beam probe.The transducer is installed on the wedge to detect.According to ray trace theory and Snell principle,the propagation path of ultrasonic wave in wedge and workpiece is determined,and the calculation formula of time delay rule of phased array with wedge is obtained.The impulse response of phased array transducer is obtained by superposing spatial impulse response of each element with wedge.The sound pressure on axis of different deflection angles is obtained by simulation,and the characteristics of the acoustic field are analyzed.The phased array experiment on the weld specimen with artificial defects is tested,and defects at different positions can be detected.The hydraulic cylinder weld of ZY9200/25/50D hydraulic support is tested on the spot.The positions and sizes of defects can be directly obtained from the image,and the acoustic field simulation can provide guidance for the testing parameters of ultrasonic phased array.
作者
董明
万回回
孙思雅
苏成明
王昕
韩磊
DONG Ming;WAN Huihui;SUN Siya;SU Chengming;WANG Xin;HAN Lei(School of Mechanical Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;Shaanxi Key Laboratory of Mine Electromechanical Equipment Intelligent Detection and Control,Xi'an 710054,China;Xi'an Intlligent Remanufacturing Research Institute Co.,Ltd.,Xi'an 710018,China;Weinan Shaanxi Coal Qichen Technology Co.,Ltd.,Weinan 714000,China)
出处
《煤炭工程》
北大核心
2023年第11期154-159,共6页
Coal Engineering
基金
国家自然科学基金项目(51705418)
陕西省自然科学基础研究计划(2021JLM-07,2019JQ-801)
陕西省教育厅专项科学研究项目(21JK0769)。
关键词
液压支架
超声相控阵检测
声场仿真
空间脉冲响应
hydraulic support
phased array ultrasonic testing
acoustic field simulation
spatial impulse response
