کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4976963 | 1451842 | 2017 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A method for acoustic source location in plate-type structures
ترجمه فارسی عنوان
یک روش برای محل منبع صوتی در ساختارهای صفحات نوعی
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کلمات کلیدی
سازه های پلیت آنتروپی شانون، تبدیل موجک، طیف فرکانس متقابل زمان، منحنی پراکندگی،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی کامپیوتر
پردازش سیگنال
چکیده انگلیسی
In this study an algorithm based on Shannon entropy, cross-time frequency spectrum (CTFS) and frequency varying velocities was proposed for structure health monitoring in two-layer plate. A linear array of two sensors is applied to capture the signals. By reducing the number of sensors we used a secondary pattern to get enough information for source locating. For this purpose a pattern for secondary points based on Shannon entropy and cost function was developed. Then to estimate the time delay of signals, cross-time frequency spectrum function was taken from captured signals. The time delay was calculated when CTFS function reached the maximum value. By taking short time Fourier transform of cross correlation function of captures signals and using dispersive curves, time delay and corresponding frequency dependent velocity are estimated. The experiments were carried out and the results showed high precision of presented algorithm.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Mechanical Systems and Signal Processing - Volume 93, 1 September 2017, Pages 92-103
Journal: Mechanical Systems and Signal Processing - Volume 93, 1 September 2017, Pages 92-103
نویسندگان
Amir Mostafapour, Saman Davoodi,