基于LFM的橡胶脱粘超声检测方法研究

针对SYS510e型空气弹簧底板的金属橡胶粘接结构橡胶脱粘缺陷超声检测难以辨识问题,提出采用改进的线性调频脉冲代替传统窄脉冲作为超声波激励信号,增大超声检测的信号能量和频谱宽度.在宽频带超声检测的基础上,采用小波包-奇异值分解方法解析超声回波在不同粘接状态、不同频率范围的时频能量分布,提取更稳定、一致性更好的橡胶脱粘辨...

Research on ultrasonic detection for rubber debonding based on LFM

In view of the problem that the ultrasonic detection of the metal rubber bonding structure of the SYS510e air spring base plate is difficult to identify the rubber debonding defect,the improved linear frequency modulation is proposed to replace the traditional narrow pulse as the ultrasonic excitation signal,which increases the signal energy and spectrum width of ultrasonic detection.Based on wide-band ultrasonic detection,wavelet packet and singular value decomposition method is used to analyze the time-frequency energy distribution of ultrasonic echo in different bonding states and frequency ranges,and more stable and consistent identification eigenvalues of rubber debonding are extracted.According to the features training BP neural network,the rubber debonding defect of air spring was detected by ultrasonic C-scan.The results show that the ultrasonic detection based on the improved linear frequency modulation can accurately and effectively identify the location and contour of rubber debonding defects,and meet the needs of the ultrasonic debonding detection of SYS510e air spring.