Lee Ho-Jun, Kyung Sae-Byeok, Kim Ju-Won
Department of Nuclear · Energy System Engineering, Graduate School, Dongguk University, Gyeongju 38066, Republic of Korea.
Department of Safety Engineering, Dongguk University WISE, Gyeongju 38066, Republic of Korea.
Sensors (Basel). 2024 May 24;24(11):3369. doi: 10.3390/s24113369.
Tension members are key members that maintain stability and improve the strength of structures such as cable-stayed bridges, PSC structures, and slopes. Their application has recently been expanded to new fields such as mooring lines in subsea structures and aerospace fields. However, the tensile strength of the tension members can be abnormal owing to various risk factors that may lead to the collapse of the entire structure. Therefore, continuous tension monitoring is necessary to ensure structural safety. In this study, an improved elasto-magnetic (E/M) sensor was used to monitor tension force using a nondestructive method. General E/M sensors have limitations that make it difficult to apply them to operating tension members owing to their solenoid structure, which requires field winding. To overcome this problem, the magnetization part of the E/M sensor was improved to a yoke-type sensor, which was used in this study. For the development of the sensors, the numerical design and magnetization performance verification of the sensor were performed through eddy current solution-type simulations using ANSYS Maxwell. Using the manufactured yoke-type E/M sensor, the induced voltage signals according to the tension force of the specimen increasing from 0 to 10 tons at 1-ton intervals were repeatedly measured using DAQ with wireless communication. The measured signals were indexed using peak-to-peak value of induced voltages and used to analyze the signal change patterns as the tension increased. Finally, the analyzed results were compared with those of a solenoid-type E/M sensor to confirm the same pattern. Therefore, it was confirmed that the tension force of a tension member can be estimated using the proposed yoke-type E/M sensor. This is expected to become an effective tension monitoring technology through performance optimization and usability verification studies for each target tension member in the future.
受拉构件是维持斜拉桥、PSC结构和边坡等结构稳定性并提高其强度的关键构件。其应用最近已扩展到海底结构的系泊缆绳和航空航天领域等新领域。然而，由于各种风险因素，受拉构件的抗拉强度可能会出现异常，这可能导致整个结构的坍塌。因此，为确保结构安全，持续的拉力监测是必要的。在本研究中，使用一种改进的电磁（E/M）传感器通过无损方法监测拉力。普通的E/M传感器存在局限性，由于其螺线管结构需要现场缠绕，难以应用于正在运行的受拉构件。为克服这一问题，将E/M传感器的磁化部分改进为轭式传感器，本研究中使用的就是这种传感器。为开发传感器，通过使用ANSYS Maxwell的涡流求解类型模拟对传感器进行了数值设计和磁化性能验证。使用制造的轭式E/M传感器，使用具有无线通信功能的数据采集器（DAQ）以1吨的间隔重复测量试样从0到10吨拉力时的感应电压信号。测量信号以感应电压的峰峰值为指标，并用于分析随着拉力增加信号的变化模式。最后，将分析结果与螺线管式E/M传感器的结果进行比较以确认相同的模式。因此，证实了使用所提出的轭式E/M传感器可以估计受拉构件的拉力。预计通过未来针对每个目标受拉构件的性能优化和可用性验证研究，这将成为一种有效的拉力监测技术。
