Investigating the performance of several frequency domain and time domain methods in calculating the dynamic parameters of a three-story structure using operational modal analysis
Subject Areas : Journal of New Applied and Computational Findings in Mechanical Systems
Mohsen Mahdavi Adeli
1
,
Hesam Makvandi
2
*
1 - Department of Mechanical Engineering, Sousangerd Branch, Islamic Azad University, Sousangerd, Iran
2 - گروه مهندسی مکانیک، واحد آبادان،دانشگاه آزاد اسلامی،آبادان، ایران
Keywords:
Abstract :
In this research, a practical method for finding modal parameters in structures is investigated. At first, two methods in the frequency domain called FDD and EFDD frequency domain analysis methods and a time domain method called SSI are defined. In order to check the accuracy of these methods in identifying the modal parameters of real structures, a three-story structure modeled in Ansys software will be used. This structure was modeled by Ansys software and the correctness of the model performance was confirmed by comparing the results of modal analysis of the structure with the results of experimental tests. The acceleration response obtained from the created model is given as an input to environmental modal analysis methods, whose responses are compared with actual results. It was observed that all three methods could estimate the frequencies, mode shapes and damping coefficients of the structure with high accuracy. It is also observed that using the SSI method is easier, but the FDD and EFDD methods need less time to solve.
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