| Summary: | 碩士 === 國立臺灣大學 === 工程科學及海洋工程學研究所 === 105 === Due to the shortage of global energy and the Environmental pollution issues, the industry of green energy has become a new trend of development in recent years. Based on the great wind field in offshore western Taiwan, the development of offshore wind turbines were taken more seriously. But the foundation of the pile in the complex marine environment, affected by the external forces like tide or earthquake easily and make it unstable.
As a result, this paper uses a single steel pipe as the model and designs a guided-wave measurement system for the detection of the pile. The detection is based on the specific mode of the echo attenuation, so the excitation of the mode and the identification of the echo signal is the focus in this paper.
This system includes self-made transmmitting circuit and piezoelectric ceramic array. The echo signal is identified by time-frequency conversion and compared with the dispersion curve plotted by PCdisp, which means to compare the correlation between the actual measurement signal and the theoretical value. The results of the analysis shows that the modes be excited and enhanced in
this system are in agreement with the theoretical values in different environments, which means it can be applied to the detection of the amplitude attenuation.
|
|---|
