大型螺栓阵列超声全聚焦成像的场能强化算法研究  

The field energy enhancement algorithm for ultrasonic phased array total focusing method imaging of large bolts

作　　者：曾广栋[1] 姬升阳[1] 毛延翩[1] 冉毅川 朱斌[1] 韩松 东蕊 ZENG Guangdong;JI Shengyang;MAO Yanpian;RAN Yichuan;ZHU Bin;HAN Song;DONG Rui(Xiluodu Hydropower Plant,China Yangtze Power Co.,Ltd,Zhaotong 657300,China;China Special Equipment Inspection&Research Institute,Beijing 100029,China)

机构地区：[1]中国长江电力股份有限公司溪洛渡水力发电厂,昭通657300 [2]中国特种设备检测研究院,北京100029

出　　处：《应用声学》2024年第6期1406-1411,共6页Journal of Applied Acoustics

基　　金：中国长江电力股份有限公司资助项目(412001032)。

摘　　要：大型螺栓大多用于连接需要承受重载和剧烈振动的构件,由于处于关键承载位置,其可靠性和稳定性对于工业结构的安全至关重要。阵列超声全聚焦成像能够提供高灵敏度、高分辨率的三维成像,为螺栓监测/检测提供了更好的质量和可靠性评价能力。但对于大型螺栓监测/检测而言,由于常规全聚焦方法使用单个阵元发射,造成在远离探头的部分超声能量较小,检测灵敏度下降。针对上述问题,提出了一种多反射场能量叠加强化的方法,针对所有反射能量场进行场能重建,将多层声场能量累加,使得缺陷处的信号增强。实验结果表明,随着声场能量层数增加,缺陷处的信号逐步增强,缺陷信噪比提高,可以检出常规全聚焦方法无法检出的小缺陷,证明该方法可以有效提高对微小缺陷的检测能力,提高全聚焦技术对螺栓的检测深度。Large bolts are mostly used to connect components that need to withstand heavy loads and severe vibrations.Because they are in key load-bearing positions,their reliability and stability are crucial to the safety of industrial structures.Large bolts need to be monitored and tested regularly during use.Array ultrasonic total focusing method(TFM)imaging can provide high-sensitivity,high-resolution three-dimensional acoustic image,providing better quality and ability to assess reliability.However,for large-scale bolt monitoring/detection,since the conventional TFM uses a single element to emit,the ultrasonic energy in the part far away from the probe is small,and the detection sensitivity is reduced.Field energy reconstruction is carried out for all the reflected energyfields,and multi-layer soundfield energy is added to enhance the signal at the defect.The experimental results show that with the increase of the energy layers of the soundfield,the signal at the defect is gradually enhanced,the signal-noise ratio(SNR)of the defect is increased,and the small defects that cannot be detected by the conventional full focusing method can be detected.It is demonstrated that this method can effectively improve the detection ability of small defects and improve the detection depth of bolts by full focusing technology.

关 键 词：成像监测 全聚焦方法 信号增强 大型螺栓 

分 类 号：O426.9[理学—声学]