کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10690379 1019245 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Acoustic emission source location in plates using wavelet analysis and cross time frequency spectrum
ترجمه فارسی عنوان
محل منبع انتشار آکوستیک در صفحات با استفاده از تحلیل موجک و طیف فرکانس متقابل
کلمات کلیدی
تجزیه بسته های موجک، انتشار آکوستیک، طیف فرکانس متقابل زمان، سرعت گروه،
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم آکوستیک و فرا صوت
چکیده انگلیسی
In this study, the theories of wavelet transform and cross-time frequency spectrum (CTFS) are used to locate AE source with frequency-varying wave velocity in plate-type structures. A rectangular array of four sensors is installed on the plate. When an impact is generated by an artificial AE source such as Hsu-Nielsen method of pencil lead breaking (PLB) at any position of the plate, the AE signals will be detected by four sensors at different times. By wavelet packet decomposition, a packet of signals with frequency range of 0.125-0.25 MHz is selected. The CTFS is calculated by the short-time Fourier transform of the cross-correlation between considered packets captured by AE sensors. The time delay is calculated when the CTFS reaches the maximum value and the corresponding frequency is extracted per this maximum value. The resulting frequency is used to calculate the group velocity of wave velocity in combination with dispersive curve. The resulted locating error shows the high precision of proposed algorithm.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics - Volume 54, Issue 8, December 2014, Pages 2055-2062
نویسندگان
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