16 P. Poozesh et al. Estimated Modes Shapes of Modified Structure Using SDM 1 2 3 4 Freq (Hz) 13.51 83.11 224.92 438.23 Impact Test (EMA) 1 14.01 1.000 0.013 0.015 0.007 2 87.32 0.016 1.000 0.016 0.008 3 242.49 0.017 0.018 0.998 0.028 4 463.49 0.020 0.016 0.038 0.990 Estimated Modes Shapes of Modified Structure Using SDM 1 2 3 4 Freq (Hz) 13.51 83.11 224.92 438.23 Impact Test (EMA) 1 14.01 0.924 0.012 -0.009 0.055 2 87.32 0.002 -1.152 -0.019 0.034 3 242.49 0.001 0.006 1.266 -0.018 4 463.49 0.000 -0.002 0.049 -1.126 MAC a b Orthogonality Orthogonality Check MAC (α0k.Ψk1.E12) (α0k.Ψk1.E12) Fig. 1.16 Correlation and orthogonality between estimated scaled operating deflections shapes, and the reference mode shapes (EMA). (a)MAC values indicating degree of consistency between estimated scaled operating deflections shapes, and the reference mode shapes. (b) Experimental mass weighted orthogonality check between estimated scaled operating deflections shapes, and the reference mode shapes References 1. Baqersad, J., Poozesh, P., Niezrecki, C., Avitabile, P.: Comparison of modal parameters extracted using MIMO, SIMO, and impact hammer tests on a three-bladed wind turbine. In: Proceeding of the 32nd IMAC, A Conference and Exposition on Structural Dynamics, Orlando, FL, pp. 185–197, February 3–6, 2014 2. Devriendt, C., Guillaume, P., Brussel, V.U., Reynders, E., Roeck, G.D.: Operational modal analysis of a bridge using transmissibility measurements. In: Proceeding of the 25th IMAC, Conference & Exposition on Structural Dynamics, Orlando, Florida, February 19–22, 2007 3. Rainieri, C., Fabbrocino, G.: Operational Modal Analysis of Civil Engineering Structures. Springer, New York (2014) 4. Peeters, B., Van der Auweraer, H., Vanhollebeke, F., Guillaume, P.: Operational modal analysis for estimating the dynamic properties of a stadium structure during a football game. Shock Vib. 14(4), 283–303 (2007) 5. Poozesh, P., Baqersad, J., Niezrecki, C., Avitabile, P.: A multi-camera stereo DIC system for extracting operating mode shapes of large scale structures. In: Proceeding of the SEM Annual Conference on Experimental and Applied Mechanics, Costa Mesa, CA, June 8–11, 2015 6. Tcherniak, D., Chauhan, S., Hansen, M.H.: Applicability limits of operational modal analysis to operational wind turbines. In: Proceeding of the 28th IMAC, A Conference and Exposition on Structural Dynamics, Springer New York, pp. 317–327, February 1–4, 2010 7. López-Aenlle, M., Brincker, R., Pelayo, F., Canteli, A.F.: On exact and approximated formulations for scaling-mode shapes in operational modal analysis by mass and stiffness change. J. Sound Vib. 331(3), 622–637 (2012) 8. Ventura, C.E., Lord, J.F., Turk, M., Brincker, R., Andersen, P., Dascotte, E.: FEM updating of tall buildings using ambient vibration data. In: Proceeding of the Sixth International Conference on Structural Dynamics (EURODYN), Paris, France, 2005 9. López-Aenlle, M., Fernández, P., Brincker, R., Fernández-Canteli, A.: Scaling-factor estimation using an optimized mass-change strategy. Mech. Syst. Signal Process. 24(5), 1260–1273 (2010) 10. Hout, B., Avitabile, P.: Application of operating data scaling techniques. In: Proceeding of the 22nd IMAC, A Conference on Structural Dynamics, Dearborn, MI, pp. 52–58, January 26–29, 2004 11. López-Aenlle, M., Brincker, R., Fernández-Canteli, A.: Some methods to determine scaled mode shapes in natural input modal analysis. In: Proceeding of the 23rd IMAC, Conference & Exposition on Structural Dynamics, Orlando, Florida, pp. 165–176, January 31–February 3 2005 12. Aenlle, M.L., Fernández, P.F., Brincker, R., Canteli, A.F.: Scaling factor estimation using an optimized mass change strategy, part 1: theory. In: Proceeding of the, International Operational Modal Analysis Conference (IOMAC), pp. 421–428, 2007 13. Fernández, P., Reynolds, P., López-Aenlle, M.: Scaling mode shapes in output-only systems by a consecutive mass change method. Exp. Mech. 51(6), 995–1005 (2011) 14. Brincker, R., Rodrigues, P., Andersen, P.: Scaling the mode shapes of a building model by mass changes. In: Proceeding of the 22nd IMAC, International Modal Analysis Conference, Dearborn, MI, pp. 119–126, January 26–29, 2004 15. Parloo, E., Verboven, P., Guillaume, P., Van Overmeire, M.: Sensitivity-based operational mode shape normalisation. Mech. Syst. Signal Process. 16(5), 757–767 (2002) 16. Khatibi, M.M., Ashory, M.R., Malekjafarian, A., Brincker, R.: Mass-stiffness change method for scaling of operational mode shapes. Mech. Syst. Signal Process. 26, 34–59 (2012)
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