针对超声导波相控阵方法中相位控制参数缺少距离和频率变量的不足,提出了多阵列超声导波频相联控激励下复合材料损伤聚焦成像方法。相比于标准的超声导波相控阵技术,该方法通过在各阵元上设置不同的激励频率,实现了在复合材料板上对点的角度-距离聚焦扫查和损伤定位。首先,建立了多阵列超声导波频相联控激励聚焦信号模型;其次,设计了一种分布式多输入多输出(MIMO)线性阵列,对监测区域逐点聚焦扫查,并建立阵列超声导波损伤回波接收,运用多重信号分类(MUSIC)方法,实现复合材料损伤成像。玻璃纤维板的仿真和试验结果表明,该方法对复合材料具有较好的聚焦性能,较高的损伤成像和定位精度。

Aiming at the shortcomings of the ultrasonic guided wave phased array method, this paper proposed a damage focusing imaging method for composite materials using multiple array of ultrasonic guided wave frequency-phased joint control excitation. Compared with the standard ultrasonic guided wave phased array technology, this method realized angle-distance focused scanning and damage locationon composite material plates by setting different excitation frequencies on each array element. Firstly, the signal model of multi-array ultrasonic guided wave frequency and phase joint control excitation focusing was established; Secondly, a distributed multiple-input multiple-output (MIMO) linear array was designed to focus and scan the monitoring area point by point, and the array ultrasonic guided wave damage echo reception was established, and the multiple signal classification (MUSIC) method was used to realize composite material Imaging of damage. The simulation and experimental results of glass fiber plate showed that the method had good focusing performance, high damage imaging and positioning accuracy for composite materials.