1.中北大学信息与通信工程学院;2.中国特种设备检测研究院
TG115.285
中国特种设备检测研究院内部科研项目2021青年14
本文针对钢构件内部切向应力检测需求,研制了双通道电磁超声传感器并搭建了基于横波双折射的高精度应力检测系统。分析了时域下不同声时提取方法及频域下不同滤波算法对应力测量结果的影响。其中,巴特沃斯滤波器滤波效果最好,信噪比与原始信号相比提升1.3倍,重复性测试下标准差为0.7；使用自相关法提取声时最稳定,其重复测试标准差仅为0.2。对Q345与L360两种钢材进行了应力测量,实验结果表明,两种材料标定曲线R2值均在在0.98以上,应力测量绝对误差小于10MPa。本文搭建的基于横波双折射的电磁超声应力检测系统具有较高的精度和稳定性。
This study focuses on the need to detect tangential stress within steel components. A dual-channel electromagnetic ultrasonic transducer was developed, and a high-precision stress measurement system based on shear wave birefringence was established. The effects of different time-of-flight extraction methods in the time domain and various filtering algorithms in the frequency domain on stress measurement results were analyzed. Among these methods, the Butterworth filter demonstrated the best performance, improving the signal-to-noise ratio by 1.3 times compared to the original signal, with a standard deviation of 0.7 in repeated tests. For time-of-flight extraction, the autocorrelation method proved to be the most stable, with a standard deviation of only 0.2 in repeated tests. Stress measurements were conducted on two types of steel, Q345 and L360. Experimental results showed that the calibration curves for both materials achieved R2 values exceeding 0.98, and the absolute error in stress measurement was less than 10 MPa. The electromagnetic ultrasonic stress measurement system based on shear wave birefringence developed in this study exhibits high accuracy and stability.
