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Operational modal analysis of structures by stochastic subspace identification with a delay index
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 Title & Authors
Operational modal analysis of structures by stochastic subspace identification with a delay index
Li, Dan; Ren, Wei-Xin; Hu, Yi-Ding; Yang, Dong;
Practical ambient excitations of engineering structures usually do not comply with the stationary-white-noise assumption in traditional operational modal analysis methods due to heavy traffic, wind guests, and other disturbances. In order to eliminate spurious modes induced by non-white noise inputs, the improved stochastic subspace identification based on a delay index is proposed in this paper for a representative kind of stationary non-white noise ambient excitations, which have nonzero autocorrelation values near the vertical axis. It relaxes the stationary-white-noise assumption of inputs by avoiding corresponding unqualified elements in the Hankel matrix. Details of the improved stochastic subspace identification algorithms and determination of the delay index are discussed. Numerical simulations on a four-story frame and laboratory vibration experiments on a simply supported beam have demonstrated the accuracy and reliability of the proposed method in eliminating spurious modes under non-white noise ambient excitations.
operational modal analysis;non-white noise ambient excitations;stochastic subspace identification;delay index;
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Araujo, I.G. and Laier, J.E. (2014), "Operational modal analysis using SVD of power spectral density transmissibility matrices", Mech. Syst. Signal Pr., 46(1), 129-145. crossref(new window)

Brincker, R., Zhang, L.M. and Andersen, P. (2001), "Modal identification of output-only systems using frequency domain decomposition", Smart Mater. Struct., 10(3), 441-445. crossref(new window)

Cooper, J.E., Desforges, M.J. and Wright, J.R. (1995), "Model parameter identification using an unknown coloured random input", Mech. Syst. Signal Pr., 9(6), 685-695. crossref(new window)

De Roeck, G., Peeters, B. and Ren, W.X. (2000), "Benchmark study on system identification through ambient vibration measurements", Proceedings of the 18th International Modal Analysis Conference (IMAC XVIII), San Antonio, TX, USA.

Devriendt, C., De Sitter, G., Vanlanduit, S. and Guillaume, P. (2009), "Operational modal analysis in the presence of harmonic excitations by the use of transmissibility measurements", Mech. Syst. Signal Pr., 23(3), 621-635. crossref(new window)

Devriendt, C. and Guillaume, P. (2007), "The use of transmissibility measurements in output-only modal analysis", Mech. Syst. Signal Pr., 21(7), 2689-2696. crossref(new window)

Dorvash, S. and Pakzad, S.N. (2012), "Effects of measurement noise on modal parameter identification", Smart Mater. Struct., 21(6), 065008. crossref(new window)

Goethals, I., Vanluyten, B. and De Moor, B. (2004), "Reliable spurious mode rejection using self learning algorithms", Proceedings of the International Conference on Noise and Vibration Engineering (ISMA 2004), Leuven, Belgium.

Goursat, M. and Mevel, L. (2008), "Covariance subspace identification: numerical analysis of spurious mode stability", Proceedings of the 26th International Modal Analysis Conference (IMAC-XXVI), Orlando, US.

Hassiotis, S. (1999), "Identification of damage using natural frequencies and system moments", Struct. Eng. Mech., 8(3), 285-297. crossref(new window)

Jacobsen, N.J. (2005), "Identifying harmonic components in operational modal analysis", Proceedings of the 12th International Congress on Sound and Vibration (ICSV 12), Lisbon, Portugal.

Li, D., Ren, W.X. and Hu, Y.D. (2011), "Output-only modal parameter identification based on augmented state space models", Proceedings of the 4th International Symposium on Innovation & Sustainability of Structures in Civil Engineering (ISISS 2011), Xiamen, China.

Lisowski, W. (2001), "Classification of vibration modes in operational modal analysis", Proceedings of the International Conference on Structural System Identification, Kassel, Germany.

Mevel, L., Benveniste, A., Basseville, M. and Goursat, M. (2002), "Blind subspace-based eigenstructure identification under nonstationary excitation using moving sensors", IEEE T. Signal Pr., 50(1), 41-48. crossref(new window)

Mohanty, P. and Rixen, D.J. (2004a), "A modified Ibrahim time domain algorithm for operational modal analysis including harmonic excitation", J. Sound Vib., 275(1), 375-390. crossref(new window)

Mohanty, P. and Rixen, D.J. (2004b), "Operational modal analysis in the presence of harmonic excitation", J. Sound Vib., 270(1-2), 93-109. crossref(new window)

Mohanty, P. and Rixen, D.J. (2006), "Modified ERA method for operational modal analysis in the presence of harmonic excitations", Mech. Syst. Signal Pr., 20(1), 114-130. crossref(new window)

Peeters, B. (2000), "System identification and damage detection in civil engineering", Ph.D. Dissertation, Katholieke Universiteit Leuven, Belgium.

Peeters, B. and De Roeck, G. (2001), "Stochastic system identification for operational modal analysis: a review", J. Dyn. Syst., Meas., Control, ASME, 123(4), 659-667. crossref(new window)

Ren, W.X., Zhao, T. and Harik, I.E. (2004), "Experimental and analytical modal analysis of steel arch bridge", J. Struct. Eng., ASCE, 130(7), 1022-1031. crossref(new window)

Ren, W.X. and Zong, Z.H. (2004), "Output-only modal parameter identification of civil engineering structures", Struct. Eng. Mech., 17, 429-444. crossref(new window)

Reynders, E. (2012), "System identification methods for (operational) modal analysis: review and comparison", Arch. Comput. Meth. E., 19(1), 51-124. crossref(new window)

Reynders, E., Pintelon, R. and De Roeck, G. (2008), "Uncertainty bounds on modal parameters obtained from stochastic subspace identification", Mech. Syst. Signal Pr., 22(4), 948-969. crossref(new window)

Saeed, K., Mechbal, N., Coffignal, G. and Verge, M. (2008), "Recursive modal parameter estimation using output-only subspace identification for structural health monitoring", Proceedings of the 16th Mediterranean Conference on Control and Automation, IEEE, Ajaccio Corsica, France.

Van der Auweraer, H. and Hermans, L. (1999), "Structural model identification from real operating conditions", J. Sound Vib., 33(1), 34-41.

Van Overschee, P. and De Moor, B. (1996), Subspace Identification for Linear Systems: Theory, Implementation, Applications, Kluwer Academic Publishers, Netherlands.

Yan, W.J. and Ren, W.X. (2013), "Use of continuous-wavelet transmissibility for structural operational modal analysis", J. Struct. Eng., ASCE, 139(9), 1444-1456. crossref(new window)

Yi, J.H. and Yun, C.B. (2004), "Comparative study on modal identification methods using output-only information", Struct. Eng. Mech., 17(3), 445-466. crossref(new window)

Yu, D.J. and Ren, W.X. (2005), "EMD-based stochastic subspace identification of structures from operational vibration measurements", Eng. Struct., 27(12), 1741-1751. crossref(new window)