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128 Chapter 5. Application to real-life case studies(a)(b)(c)(d)Figure 5.16: Mode shape estimates obtained from the Z24 bridge with ambient excitation:modes 5, 7–8 and 10, respectively indicated as a–d.were obtained for the PoGER approach.A more quantitative comparison, on a basis of MAC values between mode shapeestimates obtained from ambient and shaker excitation, is shown in Fig. 5.17.Apart from mode 7, which was a highly complex mode, all MAC values are relativelyhigh indicating a good agreement between the mode shapes found with bothtypes of excitation.5.3 ConclusionsIn this Chapter, OMA and some of its related techniques were applied to tworeal-life case studies: an agricultural tractor-sprayer boom combination and theZ24 bridge system identification benchmark.In the first part of the Chapter, a comparison was made between ML identificationresults of classic input-output and output-only modal testing experiments
5.3. Conclusions 12910.90.80.7mac value0.60.50.40.30.20.101 2 3 4 5 6 7 8 9 10modeFigure 5.17: Diagonal MAC values between corresponding mode shape estimates obtainedwith ambient and shaker excitation.conducted on the tractor-sprayer combination. The identification results werefound in good agreement. Due to the interaction of test object with the shaker table,the output-only techniques modelled the shaker table and the tractor-sprayercombination as a single structure. This fact could be clearly observed by comparingthe results obtained for all considered data sets. This experimental observationis in agreement with the results of the simulations performed in Chapter 2.Furthermore, these data allowed to investigate the applicability of the sensitivitybasedmode shape normalization approach to more complex structures. Thetechnique was applied to the mode shape estimates obtained from the tractorsprayercombination. The results were validated by comparison to the results ofthe driving-point normalization procedure.In the second part of the Chapter, the output-only multi-patch approach wasapplied to a real-life civil engineering structure. For this purpose, the Z24 bridgebenchmark data was examined and a comparison was made between the forced excitationand ambient vibration test. Due to economical/practical considerations,not all experimental DOFs could be measured simultaneous. For this reason, theresponses of the structures were measured in multiple patches. Due to the nonstationarynature of the ambient excitation, the multi-patch operational data setrequires special attention in order to correctly assemble the different parts of thebridge’s mode shape estimates.
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VRIJE UNIVERSITEIT BRUSSELSCI EN T
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VoorwoordEerst en vooral wens ik mi
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viiiContents2.4 Case study: stairwa
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xContents6.4 Conclusions . . . . .
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xiiContents9.5.4 Sensitivity-based
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2 Chapter 1. Introduction1.1 Resear
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4 Chapter 1. Introductionartificial
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6 Chapter 1. Introduction1.2 Focus
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8 Chapter 1. Introductionproblem. I
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10 Chapter 1. IntroductionChapter 6
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12 Chapter 2. Operational Modal Ana
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54 Chapter 3. Identification from m
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178 Chapter 7. Input-output and out
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220 Chapter 8. Identification of da
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242 Chapter 9. Non-linear structura
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276 Chapter 10. ConclusionsVerboven
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278 Chapter 10. Conclusionsstructur
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280 Chapter 10. Conclusions
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282 BibliographyCao, T. and Zimmerm
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284 BibliographyFrost, N., Marsh, K
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286 BibliographyLü, Z., Shao, C. a
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288 BibliographyPintelon, R. and Sc
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290 BibliographyVerboven, P. (2002)
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