兰州理工大学学报

兰州理工大学学报 ›› 2024, Vol. 50 ›› Issue (6): 99-106.

• 自动化技术与计算机技术 • 上一篇    下一篇

Barker编码超声激励系统在钢轨环境下的无损传输研究

黄玲1,2,3, 许子健1, 魏小源*1,2,3, 王刚1   

  1. 1.兰州理工大学 电气工程与信息工程学院, 甘肃 兰州 730050;
    2.兰州理工大学 甘肃省工业过程先进控制重点实验室, 甘肃 兰州 730050;
    3.兰州理工大学 电气与控制工程国家级实验教学示范中心, 甘肃 兰州 730050
  • 收稿日期:2022-06-02 出版日期:2024-12-28 发布日期:2025-01-13
  • 通讯作者: 魏小源(1988-),男,甘肃白银人,博士,副教授.Email:weixy@lut.edu.cn
  • 基金资助:
    国家自然科学基金(62101228),甘肃省科技重点研发项目(20YF3GA018),甘肃省青年科技基金(21JR7RA245),甘肃省高等学校青年博士基金(2022QB-053)

Research on lossless transmission of Barker coded ultrasonic excitation system in rail environment

HUANG Ling1,2,3, XU Zi-jian1, WEI Xiao-yuan1,2,3, WANG Gang1   

  1. 1. College of Electrical and Information Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China;
    2. Key Laboratory of Gansu Advanced Control for Industrial Processes, Lanzhou Univ. of Tech., Lanzhou 730050, China;
    3. National Demonstration Center for Experimental Electrical and Control Engineering Education, Lanzhou Univ. of Tech., Lanzhou 730050, China
  • Received:2022-06-02 Online:2024-12-28 Published:2025-01-13

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摘要： 针对超声导波在钢轨检测中受频散效应与传输介质等因素影响,导致接收信号信噪比和距离分辨率降低的问题,将Barker编码激励技术用于超声导波钢轨检测中.通过仿真对比了方波脉冲、正弦脉冲、汉宁窗调制正弦脉冲和载波周期数对Barker编码激励脉冲压缩结果的影响.研究表明,10周期载波具有最宽的主瓣宽度,其峰值旁瓣比约为－24.0 dB.通过现场试验进行实验验证,结果表明,Barker编码激励的超声导波信号经脉冲压缩处理后峰值旁瓣水平为－14.40 dB,较单脉冲激励信号提高了3.26 dB,说明利用编码激励技术在钢轨环境下进行超声导波传输具有可靠性.

关键词: 编码激励, 超声导波, 脉冲压缩

Abstract: The ultrasonic guided wave (UGW) testing has the problem of the dispersion effect and interference in the transmission medium, which degrades signal-to-noise ratio (SNR) and range resolution in the rail detection. To solve this issue, a Barker-coded excitation technology is applied to UGW rail damage detection. The comparison of the effects of square pulse, sinusoidal pulse, Hanning window sinusoidal pulse waveforms, and carrier cycles on UGW signals is performed by simulation. It is shown that the 10-cycle carrier exhibits the widest main lobe width with a peak-to-side lobe ratio of about －24.0 dB. Field experiments were conducted to validate the findings. The results show that the peak sidelobe level of the ultrasonic guided wave signal excited by Barker coding is －14.40 dB after pulse compression processing, which is 3.26 dB higher than that of a single pulse excitation signal. These findings indicate that ultrasonic-guided wave transmission using the coding excitation technology in the rail environment is reliable.

Key words: coded excitation, ultrasonic guided waves, pulsed compression

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