第五部門：応用数理問題―計算機科学から社会科学まで

[24007-12-01] Temporal changes of vibration characteristics of the F type road information board due to damages (Proceedings of Symposium on Applied Mechanics)

*Masayuki SAEKI¹, Shingo MATSUI², Tadashi KAWAMATA³ (1. Tokyo University of Science, 2. SEIWA Electric MFG CO., Ltd., 3. NEXCO-EAST Engineering Company Limited)

Keywords:vibration mode, ERA, road information board, anomaly detection, monitoring

In this research, at first, the vibration characteristics of the F type road information boards in service are estimated by analyzing the acceleration responses with the ERA method. Next, the full-scale damage experiments are conducted to investigate the temporal changes of the eigen frequencies due to several patterns of damages. Finally, the sensitivity of eigen-frequency to the damages is analyzed using a simple numerical model of a cantilever beam with a rocking spring.