Estimation of damping ratios of steel structures by Operational Modal Analysis method

Kudu, Fatma Nur; Uçak, Şenay; Osmancikli, Gökhan; Türker, Temel; Bayraktar, Alemdar

doi:10.1016/j.jcsr.2015.04.019

Cited by 34 publications

(21 citation statements)

References 4 publications

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“…(27). It makes the assumption that s = jω, the frequency response function system is expressed as Eq.…”

Section: F(s) Is Laplace Transform Of F(t) and X(s) Is Laplace Transmentioning

confidence: 99%

“…Additionally, the operational modal analysis approach is employed to the estimate modal parameters from vibration data. 26,27 Using the EMA, one can obtain the results of the tire vibration characteristics directly, 28 however, there still remain some problems such as high-cost, uncontrollable factor and systematical errors. The FEM modal analysis is another method developed based on the theory modal model in present years, which has the advantage of low-cost, convenient and comprehensive.…”

Section: Introductionmentioning

confidence: 99%

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Thermal modal analysis of novel non-pneumatic mechanical elastic wheel based on FEM and EMA

et al. 2018

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A combination of Finite Element Method (FEM) and Experiment Modal Analysis (EMA) have been employed here to characterize the structural dynamic response of mechanical elastic wheel (ME-Wheel) operating under a specific thermal environment. The influence of high thermal condition on the structural dynamic response of ME-Wheel is investigated. The obtained results indicate that the EMA results are in accordance with those obtained using the proposed Finite Element (FE) model, indicting the high reliability of this FE model applied in analyzing the modal of ME-Wheel working under practical thermal environment. It demonstrates that the structural dynamic response of ME-Wheel operating under a specific thermal condition can be predicted and evaluated using the proposed analysis method, which is beneficial for the dynamic optimization design of the wheel structure to avoid tire temperature related vibration failure and improve safety of tire.

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“…(27). It makes the assumption that s = jω, the frequency response function system is expressed as Eq.…”

Section: F(s) Is Laplace Transform Of F(t) and X(s) Is Laplace Transmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal modal analysis of novel non-pneumatic mechanical elastic wheel based on FEM and EMA

et al. 2018

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“…Yan et al proposed an enhanced PSDT approach which identified the natural frequencies using the Least Squares Complex Frequency domain (LSCF) and extracted mode shapes using SVD on the PSDT matrix [22]. Kudu et al compared the natural frequencies and the quality of modal damping ratios obtained by EFDD and SSI, taking into account the measurement duration, the frequency range, and the sampling rate [23]. The change in natural frequencies was shown to be negligible, but the modal damping ratios were changed under different analytical conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effect of Excitation Type on the Output-Only Modal Analysis Results

Varahram¹,

Jalali²,

Sadeghi³

et al. 2019

TFAMENA

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Output-only Modal Analysis (OMA) has found extensive use in the identification of dynamic properties of structures. This study aims to investigate the effect of excitation force on the accuracy of modal parameters. For this purpose, the modal parameters of a simply supported beam are obtained through the Experimental Modal Analysis (EMA) and the OMA method using three different types of artificial and natural excitations, namely a shaker, acoustic waves, and environmental noise. Frequency Domain Decomposition (FDD) technique is used to identify dynamic characteristics. Finally, these results are compared with those obtained by the analytical method and the EMA method. The results demonstrated the following: 1) Acoustic excitation presents the natural frequencies with the smallest errors in comparison with the analytical results. 2) Inaccuracy is observed at certain natural frequencies during the excitation with a shaker with respect to the connecting point between the shaker and the beam. 3) Modal Assurance Criterion (MAC) showed that the mode shapes extracted by the acoustic excitations are more similar to the analytical results.

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“…They also investigated the effects of noise in signal, measurement time, vibration amplitudes and stationarity of the response on damping estimation. Kudu et al [12] determined the MDRs of a three-story steel building using EFDD and SSI methods. Their results showed that although the change in the natural frequencies was very small, the MDRs were changed considerably.…”

Section: Introductionmentioning

confidence: 99%

Damping estimation of a double layer grid with ball joint system by output-only modal identification

et al. 2019

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Modal parameters of large civil engineering structures such as modal damping ratios (MDRs) are determined mainly by output-only modal identification. In this paper, MDRs of a double layer grid were obtained using output-only modal identification. For this purpose, a double layer grid constructed from ball-joint system was tested. Doing some random tapping on the structure, the acceleration response in multiple locations was measured. The acquired data was processed using output-only modal identification to arrive at MDRs. The MDRs corresponding to the first eight modes of the grid were extracted by five output-only modal identification techniques; namely enhanced frequency domain decomposition (EFDD), curve-fit frequency domain decomposition (CFDD) and three different methods of data-driven stochastic subspace identification. To determine the appropriate model order used in SSI methods, a sensitivity analysis was carried out and the resulting number of order was 200. The proper frequency resolution of 1600 was also determined to estimate the MDRs of the grid by EFDD and CFDD. The results showed that the MDRs of the grid, obtained from different methods, are in good agreement with each other. The grid has very low MDRs, as the MDRs of the modes measured from different methods varied from 0.06% to 0.11%.

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Estimation of damping ratios of steel structures by Operational Modal Analysis method

Cited by 34 publications

References 4 publications

Thermal modal analysis of novel non-pneumatic mechanical elastic wheel based on FEM and EMA

Thermal modal analysis of novel non-pneumatic mechanical elastic wheel based on FEM and EMA

Experimental Study on the Effect of Excitation Type on the Output-Only Modal Analysis Results

Damping estimation of a double layer grid with ball joint system by output-only modal identification

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