TY - GEN
T1 - Output-only modal parameter identification on least square time-frequency analysis for time-varying structure
AU - Zhou, Sida
AU - Liu, Li
PY - 2010
Y1 - 2010
N2 - Time-frequency transformation is a powerful tool to analyze and represent non-stationary stochastic signals, especially for the spectrum changed with time. And under the stochastic natural excitation on operational status, the responses of time-varying structure are always non-stationary stochastic process. Therefore, directly, it is conceivable and potential to identify the modal parameter of time-varying structure with available time-frequency approaches. This work studies the contents that are correlative with time-frequency analysis, compares the approaches of time-frequency representation for modal parameter identification, and based on the time-frequency plot, develops a nonlinear weighted least square estimation to identify the main modal parameters for timevarying structure through separating each frequency ridge from the whole time-frequency representation plot. Furthermore, this method is validated by a simulated time-varying spring-mass system under an assumed random excitation.
AB - Time-frequency transformation is a powerful tool to analyze and represent non-stationary stochastic signals, especially for the spectrum changed with time. And under the stochastic natural excitation on operational status, the responses of time-varying structure are always non-stationary stochastic process. Therefore, directly, it is conceivable and potential to identify the modal parameter of time-varying structure with available time-frequency approaches. This work studies the contents that are correlative with time-frequency analysis, compares the approaches of time-frequency representation for modal parameter identification, and based on the time-frequency plot, develops a nonlinear weighted least square estimation to identify the main modal parameters for timevarying structure through separating each frequency ridge from the whole time-frequency representation plot. Furthermore, this method is validated by a simulated time-varying spring-mass system under an assumed random excitation.
UR - http://www.scopus.com/inward/record.url?scp=84951172702&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84951172702
T3 - Proceedings of ISMA 2010 - International Conference on Noise and Vibration Engineering, including USD 2010
SP - 3317
EP - 3330
BT - Proceedings of ISMA 2010 - International Conference on Noise and Vibration Engineering, including USD 2010
A2 - Sas, P.
A2 - Bergen, B.
PB - Katholieke Universiteit Leuven
T2 - 24th International Conference on Noise and Vibration Engineering, ISMA 2010, in conjunction with the 3rd International Conference on Uncertainty in Structural Dynamics, USD 2010
Y2 - 20 September 2010 through 22 September 2010
ER -