Kye Seungkyung, Jung Hyung-Jo, Jung Ho-Yeon
Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34140, Korea.
Advanced Technology Department, Hyundai Construction Equipment, 17-10, Mabuk-ro 240 beon-gil, Giheung-gu, Yongin-si, Gyeonggi-do 16891, Korea.
Sensors (Basel). 2019 Jun 10;19(11):2631. doi: 10.3390/s19112631.
The vibration of cables in a cable-supported bridge affects its serviceability and safety. Therefore, cable dampers are essential for vibration control, monitoring, and the further maintenance of such bridges. In this study, the vibration control performance of an electrodynamic damper applied to a cable used in a footbridge was experimentally verified considering the major design variables of the damper. The damping performance was analyzed by varying the damping ratio according to the excitation condition and external circuit resistance. The acceleration and displacement at each measurement point and the frequency-domain response decreased. Considering the dominant response conditions of the cables in the bridge, an effective additional attenuation was observed. In addition, the harvesting power considering the measurement frequency and power loss was sufficient to operate a wireless measuring sensor by examining the energy harvesting performance from the cable measurement data of an actual bridge in service. Finally, a stepwise operation strategy for a cable vibration monitoring system was suggested and examined by analyzing the meteorological observation data and the power output according to the wind environment. The results demonstrate the feasibility of using an electrodynamic damper to build an integrated monitoring system capable of simultaneous cable vibration reduction and energy harvesting.
斜拉桥中缆索的振动会影响其使用性能和安全性。因此，缆索阻尼器对于此类桥梁的振动控制、监测及后续维护至关重要。在本研究中，考虑阻尼器的主要设计变量，通过实验验证了应用于人行天桥缆索的电动阻尼器的振动控制性能。根据激励条件和外部电路电阻改变阻尼比，分析了阻尼性能。各测量点的加速度和位移以及频域响应均有所降低。考虑到桥梁中缆索的主要响应条件，观察到了有效的附加衰减。此外，通过检查实际在用桥梁的缆索测量数据的能量收集性能，考虑测量频率和功率损耗后的收集功率足以驱动无线测量传感器。最后，通过分析气象观测数据和根据风环境的功率输出，提出并检验了缆索振动监测系统的逐步运行策略。结果证明了使用电动阻尼器构建能够同时降低缆索振动和收集能量的集成监测系统的可行性。
