TY - GEN
T1 - Operational modal analysis based on time-domain expansion of transmissibility
AU - Kang, J.
AU - Liu, L.
AU - Zhou, S. D.
AU - Yu, L.
N1 - Publisher Copyright:
© Proceedings of ISMA 2018 - International Conference on Noise and Vibration Engineering and USD 2018 - International Conference on Uncertainty in Structural Dynamics. All rights reserved.
PY - 2018
Y1 - 2018
N2 - Transmissibility based operational modal analysis (TOMA) can estimate the modal parameters under nonwhite excitations. The transmissibility functions defined in frequency-domain require the Fourier transformation of time-domain responses into frequency-domain data, which leads to problems of leakage errors and selection of window function. This paper presents a novel time-domain expansion of transmissibility (TDET) to avoid the Fourier transformation. This expansion implies the definition of Auto-Regressive with eXogenous excitation (ARX) model, by using time-domain reference responses and non-reference responses to replace the eXogenous and Auto-Regressive part, respectively. The comparative results from two simulation examples show that the TDET-based operational modal analysis method presents overall better performance than the TOMA method in terms of the modal parameters estimation accuracy and the spurious modes suppression.
AB - Transmissibility based operational modal analysis (TOMA) can estimate the modal parameters under nonwhite excitations. The transmissibility functions defined in frequency-domain require the Fourier transformation of time-domain responses into frequency-domain data, which leads to problems of leakage errors and selection of window function. This paper presents a novel time-domain expansion of transmissibility (TDET) to avoid the Fourier transformation. This expansion implies the definition of Auto-Regressive with eXogenous excitation (ARX) model, by using time-domain reference responses and non-reference responses to replace the eXogenous and Auto-Regressive part, respectively. The comparative results from two simulation examples show that the TDET-based operational modal analysis method presents overall better performance than the TOMA method in terms of the modal parameters estimation accuracy and the spurious modes suppression.
UR - http://www.scopus.com/inward/record.url?scp=85060393439&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85060393439
T3 - Proceedings of ISMA 2018 - International Conference on Noise and Vibration Engineering and USD 2018 - International Conference on Uncertainty in Structural Dynamics
SP - 2887
EP - 2901
BT - Proceedings of ISMA 2018 - International Conference on Noise and Vibration Engineering and USD 2018 - International Conference on Uncertainty in Structural Dynamics
A2 - Moens, D.
A2 - Desmet, W.
A2 - Pluymers, B.
A2 - Rottiers, W.
PB - KU Leuven - Departement Werktuigkunde
T2 - 28th International Conference on Noise and Vibration Engineering, ISMA 2018 and 7th International Conference on Uncertainty in Structural Dynamics, USD 2018
Y2 - 17 September 2018 through 19 September 2018
ER -