کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6893396 | 1445561 | 2017 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Damping Identification of Bridges Under Nonstationary Ambient Vibration
ترجمه فارسی عنوان
شناسایی مگس های پل ها در اثر ارتعاش محیطی غیر دائمی
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کلمات کلیدی
دمیدن، تجزیه و تحلیل مودال عملیاتی، ارتعاش ناشی از ترافیک، غیر متناوب، ایستگاه بندی سیگنال، امپدانس مدولاسیون، پل کابل ماندن تعلیق،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی کامپیوتر
علوم کامپیوتر (عمومی)
چکیده انگلیسی
This research focuses on identifying the damping ratio of bridges using nonstationary ambient vibration data. The damping ratios of bridges in service have generally been identified using operational modal analysis (OMA) based on a stationary white noise assumption for input signals. However, most bridges are generally subjected to nonstationary excitations while in service, and this violation of the basic assumption can lead to uncertainties in damping identification. To deal with nonstationarity, an amplitude-modulating function was calculated from measured responses to eliminate global trends caused by nonstationary input. A natural excitation technique (NExT)-eigensystem realization algorithm (ERA) was applied to estimate the damping ratio for a stationarized process. To improve the accuracy of OMA-based damping estimates, a comparative analysis was performed between an extracted stationary process and nonstationary data to assess the effect of eliminating nonstationarity. The mean value and standard deviation of the damping ratio for the first vertical mode decreased after signal stationarization.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Engineering - Volume 3, Issue 6, December 2017, Pages 839-844
Journal: Engineering - Volume 3, Issue 6, December 2017, Pages 839-844
نویسندگان
Sunjoong Kim, Ho-Kyung Kim,