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124 Chapter 5. Application to real-life case studies−30−20−50−40−70−60−90−80−110−100−130−120−150−140−1705 10 15 20 25 30Frequency (Hz)−1605 10 15 20 25 30Frequency (Hz)(a)(b)−20−20−40−30−60−40−80−50−100−60−120−70−140−80−1605 10 15 20 25 30Frequency (Hz)−905 10 15 20 25 30Frequency (Hz)(c)(d)Figure 5.12: Examples of spectral data. Auto and cross power estimates, from the OMAtest, between the third reference response and the 3 reference responses: as obtained frompatch 1 (a), from patch 5 (b) and the average over all 9 patches (c). Frequency responsefunctions between the third reference response and the 2 excitation forces measuredduring the EMA test (d).that the block size has an important effect on the damping ratio estimates. Thedamping ratios for the first 3 modes of the Z24 bridge, estimated on a basis ofthe H 1 data sets with varying block sizes and Hanning window, are shown inFig. 5.11. It can be seen that the damping ratio estimates from the consideredmodes stabilize from about 2048 block size on. A block size of 4096 samples waseventually chosen for both input-output as well as output-only data sets. Thischoice of block size yields FRF and cross power estimates with 2048 spectral lines.Examples of FRFs, obtained from this data set, are shown in Fig. 5.12(d).
5.2. Civil engineering application: the Z24 bridge bench mark 125(a)(b)(c)(d)(e)(f)Figure 5.13: Mode shape estimates obtained from the Z24 bridge with shaker excitation:modes 1–6, respectively indicated as a–f.Ambient vibration testingThe ambient data consists of 9 patches with a total of 99 measurements including3 reference measurements that were common to all patches. The data acquisitionparameters were set in the same way as with the EMA. The ambient excitationsources on the bridge were wind, traffic on the highway and pedestrians that werepart of the test crew. The three reference response signals remained in fixedpositions during the entire test. The first reference response was measured inthe vertical direction on a side span. The second and third were measured in a
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VRIJE UNIVERSITEIT BRUSSELSCI EN T
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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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174 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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