کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1456835 | 989226 | 2011 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Wavelet-based analysis of ultrasonic longitudinal and transverse pulses in cement-based materials Wavelet-based analysis of ultrasonic longitudinal and transverse pulses in cement-based materials](/preview/png/1456835.png)
Ultrasonic pulse velocity has been used for decades to detect localized damage and to estimate concrete properties. More recent applications aim at diffuse damage characterization, such as environmental and mechanical damage. In most applications the methodology to calculate pulse speed is a very important issue. This work, applying continuous wavelet transform (CWT) to construct time-frequency signal representations, calculates frequency-dependent velocity of longitudinal and transverse ultrasonic pulses using wavelet scales. The method is applied to a total of 14 specimens of 5 different mixes and frequency-dependent velocities are calculated using four wavelet families. The CWT capability to decompose the inquiring pulse spectrum and analyze phase velocities is discussed with regard to wavelet, pulse type, and mixture. Frequency-dependent velocity of longitudinal pulses at lower frequencies (from 100 kHz up to 250 kHz) was proven to be much more sensitive to mix proportions than transverse pulses.
Journal: Cement and Concrete Research - Volume 41, Issue 11, November 2011, Pages 1185–1195