用于钢绞线的磁弹应力和磁致伸缩导波同步检测技术

Technology of Simultaneously Conducting Elasto-Magnetic Tensile Stress Measurement and Magnetostrictive-based Ultrasonic Guided Waves Inspection in Steel Strands

为在钢绞线中实现磁弹应力和超声导波的同步检测,提出了一种高、低频叠加的励磁方法,并基于2种具有宽频带特性的功率放大器,构建了专用实验装置.基于KH7500功放的实验装置中,一体化传感器检测线圈输出电压的高频成分即为磁致伸缩纵向模态超声导波信号,低频成分携带了局部磁滞回线信息;当实验装置采用BMP-360T功放时,传感器采用2个独立的感应线圈,可分别检测局部磁滞回线和超声导波信号.2套实验装置获得的检测结果均表明:低频感应电压峰值与应力间存在良好线性关系,真正实现了钢绞线中超声导波、磁弹应力的同步检测.

A magnetization method using superimposed high-and low-frequency magnetic field was proposed to simultaneously achieve elasto-magnetic tensile stress measurement and ultrasonic guided waves inspection in steel strands. Two versions of experimental set-ups were constructed based on two types of amplifiers. In the experimental set-up using KH7500 amplifier, the high frequency component of the output signal of the integrated sensor represented magnetostrictive-based ultrasonic guided waves, and the low frequency component carried the information of minor hysteresis loop. In the experimental set-up using BMP-360T amplifier, the sensor employed two individual sensing coils to detect the signals of minor hysteresis loop and ultrasonic guided waves, respectively. The experimental results obtained from the two versions of experimental set-ups show that there is a good linear relationship between the peak value of the low frequency induced voltage and the tensile stress. The research outcomes provide technique for simultaneously conducting elasto-magnetic tensile stress measurement and ultrasonic guided waves inspection in steel strands.