کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6955559 1451860 2016 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structural damage localization by outlier analysis of signal-processed mode shapes - Analytical and experimental validation
ترجمه فارسی عنوان
محلی سازی آسیب های سازه ای با تحلیل بیرونی شکل های شکل سیگنال پردازش - اعتبار تحلیلی و تجربی
کلمات کلیدی
نظارت بر سلامت سازمانی، محلی سازی آسیب، تغییر شکل موج، اپراتور انرژی دیجیتال عمومی، اپراتور انرژی کایزر، تجزیه و تحلیل بیرونی،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر پردازش سیگنال
چکیده انگلیسی
Contrary to global modal parameters such as eigenfrequencies, mode shapes inherently provide structural information on a local level. Therefore, this particular modal parameter and its derivatives are utilized extensively for damage identification. Typically, more or less advanced mathematical methods are employed to identify damage-induced discontinuities in the spatial mode shape signals, hereby, potentially, facilitating damage detection and/or localization. However, by being based on distinguishing damage-induced discontinuities from other signal irregularities, an intrinsic deficiency in these methods is the high sensitivity towards measurement noise. In the present paper, a damage localization method which, compared to the conventional mode shape-based methods, has greatly enhanced robustness towards measurement noise is proposed. The method is based on signal processing of a spatial mode shape by means of continuous wavelet transformation (CWT) and subsequent application of a generalized discrete Teager-Kaiser energy operator (GDTKEO) to identify damage-induced mode shape discontinuities. In order to evaluate whether the identified discontinuities are in fact damage-induced, outlier analysis is conducted by applying the Mahalanobis metric to major principal scores of the sensor-located bands of the signal-processed mode shape. The method is tested analytically and benchmarked with other mode shape-based damage localization approaches on the basis of a free-vibrating beam and validated experimentally in the context of a residential-sized wind turbine blade subjected to an impulse load.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Mechanical Systems and Signal Processing - Volumes 68–69, February 2016, Pages 1-14
نویسندگان
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