Abstract
This study presents a technique to identify the vibration characteristics in power transmission towers and to detect the potential structural damages. This method is based on the curvature of the mode shapes coupled with a continuous wavelet transform. The elaborated numerical method is based on signal processing of the output that resulted from ambient vibration. This technique benefits from a limited number of sensors, which makes it a cost-effective approach compared to others. The optimal spatial location for these sensors is obtained by the minimization of the non-diagonal entries in the modal assurance criterion (MAC) matrix. The Hilbert–Huang transform was also used to identify the dynamic anatomy of the structure. In order to simulate the realistic condition of the measured structural response in the field condition, a 10% noise is added to the response of the numerical model. Four damage scenarios were considered, and the potential damages were identified using wavelet transform on the difference of mode shapes curvature in the intact and damaged towers. Results show a promising accuracy considering the small number of applied sensors. This study proposes a low-cost and feasible technique for structural health monitoring.
Highlights
Continuous health monitoring of transmission networks is a vital task to prevent sudden failure in power transmission lines
A unique technique based on the curvature of the mode shapes along with continuous wavelet transform is presented to detect the potential damage location in the power transmission tower structures
The developed numerical model in this study is based on information provided by the electrical company responsible for the construction of the tower
Summary
Continuous health monitoring of transmission networks is a vital task to prevent sudden failure in power transmission lines. Performance of the transmission lines is sometimes affected negatively by some factors, which may disrupt the power distribution network. The cost of repairing the power transmission lines is very high, at about one million dollars per kilometer [1]. Such towers are damageable against the wind loads, the world-wide experiences show their vulnerability subjected to earthquake ground motions and storm events, as well.
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