頁籤選單縮合
題 名 | Rail Structure Analysis by Empirical Mode Decomposition and Hilbert Huang Transform |
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作 者 | Ho, Huan-hsuan; Chen, Po-lin; Chang, Dave Ta-teh; Tseng, Chih-hao; | 書刊名 | 淡江理工學刊 |
卷 期 | 13:3 2010.09[民99.09] |
頁 次 | 頁267-279 |
分類號 | 440.12 |
關鍵詞 | Empirical mode decomposition; Fast fourier transform Analysis; Hilbert-huang transform; |
語 文 | 英文(English) |
英文摘要 | Abstract The main purpose of this study is to explore the feasibility and applicability of using EMD and HHT on the analysis of track structure system through laboratory testing and vibration testing. The research process is divided into two phases, the first section is rail vibration frequency testing, It was measured the vertical (Z direction) natural frequency of a single span rail in the laboratory. The analysis methods use EMS and HHT spectrum analysis theory, as well as on FFT, in order to know the different results of the two methods. The results of interval rail vibration frequency test showed that Z direction range is 720 Hz, and is roughly the same as the scope defined by existent documentations. The significant results obtained by the analysis of EMD and HHT, and percepts the different self-vibration frequencies of injury and normal rail; as is known from the simulation results, for the different vertical support conditions of standard section and hollowed out section, the vibration frequency of the track structure decreased from standard section’s 700 Hz to 400 Hz, this phenomenon is very clear for the application of EMD and HHT, and further confirmed the feasibility and applicability of EMD and HHT used in track structure. In addition, the accelerometer at rail effective on quantity examine laying ranging interval between 8 m, so it is not good for the economic benefits, vibration signals obtained by setting up the accelerometer on the top of the locomotive is complicated, but remain valid by doing HHT spectrum analysis after EMD signal decomposition, and can help to further targeting the damage location. Finally, by comparing the results of HHT and FFT analysis, we confirmed that FFT can only get the average natural frequency which has nothing to do with time, it can not be used to calculate the possible damaged location of the track structure, while HHT can obtain time-varying frequency and energy calibration, then we can effectively calculate the possible damaged location of the track structure. By comprehensively analyzing the results, EMD and HHT has the practical advantage and broader applicability than FFT. |
本系統中英文摘要資訊取自各篇刊載內容。