橋梁沖刷感測器的研發與測試

黃國亮

doi:10.6840/CYCU.2014.00031、10.6840/cycu201401014

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橋梁沖刷感測器的研發與測試

Developments and verifications of bridge scouring sensors

黃國亮 , Masters　　Advisor：黃仲偉　　

繁體中文 DOI： 10.6840/CYCU.2014.00031、10.6840/cycu201401014

希爾伯特-黃轉換；簧片感測器；沖刷深度；沖刷監測； HHT ； fundamental frequency ； scour depth ； Scour sensor

Abstract │ Reference (37) │ Altmetrics

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Bridge scour is the major cause for many bridge failures and damage to piers and abutments.  Scour is not easily discernible since it is hidden under the channel flow.  Over the years, a number of sensors have been developed for detection of scour depth.  Development, testing, and small-scale field implementation of a new and simple type of scour sensor in a flume are described in this study.  The proposed sensor uses a MEMS accelerometer and attached to a reed which is fixed on the considered pier.  The scour depth detection concept is based on observing the amplitude of acceleration time history whether reached the threshold or not.  In addition, the relationship between the fundamental frequency of the pier and the scour depth is also discussed.  The fundamental frequency of the pier is obtained from the acceleration time history, acquisition by the accelerometer on the top of the pier, using Hilbert-Huang Transfer (HHT) method.  Experiment results demonstrate that the fundamental frequency decreased with increasing the scour depth.  Furthermore, the proposed sensor could be used as a water-level indicator, scour depth sensor, and anemometer.

Reference ( 37 ) 〈TOP〉

Bergmeister, K. and Santa, U., (2001), “Global monitoring concepts for bridges,” Structural Concrete, 2(1), pp. 29-39.
連結：
Ciang, C. C., Lee, J. R., and Bang, H. J., (2008), “Structural health monitoring for a wind turbine system: a review of damage detection methods,” Measurement Science and Technology, 19(12), pp. 1-20.
連結：
Huang, N. E., Shen, Z., Long, S. R., Wu, M. C., Shih, H. H., Zheng, Q., Yen, N. C., Tung, C. C., and Liu, H. H., (1998), “The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis,” Proceedings of the Royal Society of London A, 454, pp. 903-995.
連結：
Huang, N. E., Shen, Z., Long, S. R., (1999), “A new view of nonlinear water waves: the Hilbert spectrum,” Annual Review of Fluid Mechanics, 31, pp. 417-457.
連結：
Ko, J. M. and Ni, Y. Q., (2005), “Technology developments in structural health monitoring of large-scale bridges,” Engineering Structures, 27(12), pp. 1715-1725.
連結：

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