摘要
交流电磁场检测(Alternating Current Field Measuremnt,ACFM)技术因受速度和提离效应影响小,在钢轨裂纹高速检测中具有良好的应用前景,但信号拾取速度会导致裂纹信号频率发生偏移,造成量化误差、漏检和误检。为提高ACFM技术在钢轨裂纹检测中的可靠性,基于现场可编程门阵列(Field Programmable Gate Array,FPGA)研发了交流电磁场钢轨表面裂纹高速检测信号处理模块,采用理论推导方法分析了检测速度对裂纹信号频率偏移的影响,构建了检测速度与裂纹信号有效频率范围之间的关系。采用FPGA开发了具有截止频率自动跟踪检测速度的数字正交锁相放大器,同时,开发了完整的钢轨表面裂纹检测装置和实验系统,最终,通过实验验证了模块的检测能力和稳定性。
Alternating current field measurement(ACFM)technology has a good application prospect in rail crack detection due to small influence from speed and lifting effect.However,the signal picking speed can cause the crack signal frequency to shift,resulting in quantization error,missed detection and false detection.In order to improve the reliability of ACFM technology in rail crack detection,signal processing module for highspeed detection of alternating current field rail surface crack is developed based on field pragrammable gate array(FPGA).The influence of detection speed on frequency shift of crack signal is studied by theoretical derivation method,and the relationship between detection speed and effective frequency range of crack signal is built.A digital orthogonal lock-phase amplifier with cut-off frequency automatic tracking detection speed is developed using FPGA.At the same time,a complete rail surface crack detection device and experimental system are developed.Finally,the detection ability and stability of the module are verified by experiments.
作者
陈炫昂
葛玖浩
胡宝旺
CHEN Xuanang;GE Jiuhao;HU Baowang(Nondestructive Detection and Monitoring Technology for High Speed Transportation Facilities,Key Laboratory of Ministry of Industry and Information Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China)
出处
《测控技术》
2024年第7期1-8,共8页
Measurement & Control Technology
基金
国家自然科学基金青年基金资助项目(61903191)
中央高校基本科研业务费(NS2022038)
南京航空航天大学研究生创新计划(xcxjh20220343)。
