58 B. Weekes and D. Ewins instances of spatial aliasing. The updated model was clearly affected by the change in the number of degrees of freedom, although the merit in the increased number of measurement locations is difficult to qualify and is likely application-specific. Interpretation of results from model updating is often difficult, and the model updating process itself will—for better or worse—converge towards a solution based solely on the parameters, responses and metric for correlation defined by the operator. However, the option to match the response of the finite element model to an experimental measurement at a greater number of locations as afforded by use of SLDV often appears appealing. References 1. Rothberg S (2006) Numerical simulation of speckle noise in laser vibrometry. Appl Opt 45:4523–4533 2. Sraric M, Allen M (2009) Experimental investigation of the effect of speckle noise on continuous scan laser doppler vibrometer measurements. In: IMACXXVII, Orlando, FL 3. AIVELA (2012) Ancona 4. Ewins D (2000) Modal testing 2. Research Studies Press Ltd., Hertfordshire 5. University of Cincinnati, SDRL, “Universal File Formats for Modal Analysis Testing,” [Online]. Available http://www.sdrl.uc.edu/universalfile-formats-for-modal-analysis-testing-1/universal-file-formats-for-modal-analysis-testing. 6. Arun KS, Huang TS, Blostein SD (1987) Least-squares fitting of two 3D point sets. IEEE Trans Pattern Anal Mach Intell 9(5):698–700
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