Development of EMAT Based Axial Load Measurement System for In-service Bolts
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摘要: 为解决在役螺栓轴力测量的技术难题，根据基于波型转换的单传感器螺栓轴力超声测量原理，研制出一套在役螺栓轴力电磁超声测量系统。详细介绍了电磁超声探头、主机和测量软件等系统的组成部分。实验室和现场试验证明,该系统能够用于在役螺栓轴力测量，测量相对误差不超过10%。该系统采用电磁超声非接触耦合，避免了耦合剂影响，测量结果具有良好的稳定性，为螺栓轴力控制提供了一种新的技术手段。Abstract: To solve the technical problems of the axial load measurement of in-service bolts, the measurement system for the axial load of in-service bolts using the electromagnetic acoustic transducers is developed according to the principle of axial load measurement based on mode conversion. It consists of electromagnetic acoustic transducer, host, and software. Laboratory and field experiments indicated that the system could be used in axial load measurement of in-service bolts and the measuring relative error was less than 10%. The advantage of the system is that the electromagnetic acoustic transduction is adopted to obtain the good stability and to avoid the effect of couplant in the traditional piezoelectric transduction. In the meanwhile, a new technical means for the bolt axial load control is also provided.
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