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The efficiency assessment of output-only modal identification methods for noise-infected data | ||
International Journal of Nonlinear Analysis and Applications | ||
مقالات آماده انتشار، اصلاح شده برای چاپ، انتشار آنلاین از تاریخ 14 شهریور 1404 اصل مقاله (792.54 K) | ||
نوع مقاله: Research Paper | ||
شناسه دیجیتال (DOI): 10.22075/ijnaa.2025.36806.5395 | ||
نویسندگان | ||
Leila Khanmohammadi* ؛ Seyed Amin Mostafavian | ||
Department of Civil Engineering, Faculty of Engineering, Payame Noor University, Tehran, Iran | ||
تاریخ دریافت: 17 بهمن 1403، تاریخ پذیرش: 17 فروردین 1404 | ||
چکیده | ||
The modal parameters obtained from the first few vibration modes of structures have many applications. To identify these modal parameters in civil engineering structures, the output data of the structures is usually used. These data contain the structural response and some noise. The modal parameters are affected by noise in the output data. The present work has been done to assess the possibility and accuracy of identifying the modal parameters of beams in the presence of noise. To do this, the modal parameters of the different modes of single-span beams were obtained using output data with different signal-to-noise ratios. The acceleration signals were obtained by transient analysis, and then different powers of noise were generated and added to the signals. The modal parameters of the beams were obtained using Peak Picking, Frequency Domain Decomposition and Data-Driven Stochastic Subspace Identification output-only methods. Using signal-to-noise ratios of 13.98 db or greater, modal parameters were identified for all the considered modes. At a signal-to-noise ratio of -6.02 to 13.98 db (higher noise level), it was not possible to identify the modal parameters of the first mode of beams, but the parameters of the higher modes were identified with good accuracy. | ||
کلیدواژهها | ||
Structural identification؛ Output-only method؛ Single-span beam؛ Signal-to-noise ratio | ||
مراجع | ||
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