|Table of Contents|

Response Spectrum Analysis of Carbon Dioxide Phase Change Cracking Signal(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2018年第05期
Page:
645-651
Research Field:
工程地质
Publishing date:

Info

Title:
Response Spectrum Analysis of Carbon Dioxide Phase Change Cracking Signal
Author(s):
SHEN Xin LI Zhi-qing HU Rui-lin GAO Wei
1. Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China
Keywords:
carbon dioxide phase change cracking response spectrum signal velocity acceleration ensemble empirical mode decomposition field test fast Fourier transform
PACS:
TD235
DOI:
-
Abstract:
In order to study the effect of carbon dioxide phase change cracking process on the structure, the response spectrum analysis was carried out on the data obtained from field tests. First of all, the velocity signal is subjected to fast Fourier transform to analyze its spectral characteristics; then, the velocity signal is directly differentiated, the low-pass denoising is performed by using ensemble empirical mode decomposition(EEMD), and the reconstructed signal of the main characteristic frequency band is extracted to obtain a clear acceleration-time history curve; the acceleration curve after the denoising is used as the input signal to study the response spectrum of the carbon dioxide phase change cracking signal with different damping ratios. The results show that the frequency of carbon dioxide phase change cracking signal is concentrated in low frequency, the peak velocity and the main frequency are within the safe allowable range, and it is suitable for vibration sensitive environment; EEMD can effectively inhibit the high frequency oscillation caused by direct differentiation of the velocity signal, and the signal to noise ratio can reach up to 25 dB; the carbon dioxide phase change cracking response spectrum is simple, and the peak corresponding period is small, which is conducive to structural safety; the peak values of the relative displacement and the relative velocity response spectrums decrease with the increase of damping ratio, but the peak corresponding cycle is constant; the peak values of the absolute acceleration and the standard acceleration response spectrums are equal at non-zero damping ratio, which is not affected by damping ratio; attention is paid to the period in the response spectrum that has a large influence on the structure, and the stability of the structure can be guaranteed to some extent.

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Last Update: 2018-10-01