Simulation and validation of ODS measurements made using a Continuous SLDV method on a beam excited by a pseudo random signal

Dario Di Maio*, G. Carloni, D. J. Ewins

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

1 Citation (Scopus)

Abstract

Continuous-Scanning LDV (CSLDV) methods are now available as alternative approaches to the conventional Stepping mode for Operational Deflection Shape (ODS) measurements. CSLDV techniques were initially used with sinusoidal excitation of the tested structure but later these techniques have been extended for use with impact excitation where the LDV time history could be also used to extract modal parameters by post-processing the data using modal analysis software. The latest extension of CSLDV is the use of a pseudo random signal to excite the tested structure for this work, a cantilever steel beam was used. Analytical models of the structure, the LDV output signal and excitation waveform were produced to simulate several responses which could be studied to identify the relationship between three fundamental parameters: (i) LDV scan rate, (ii) sampling frequency and (iii) frequency resolution of the pseudo random signal. This paper produces a theoretical background of the study presenting simulations and validations of both LDV output time signals and ODSs, respectively.

Original languageEnglish
Title of host publicationConference Proceedings of the Society for Experimental Mechanics Series
Pages1-14
Number of pages14
Volume3
EditionPART 1
Publication statusPublished - 2011
Event28th IMAC, A Conference on Structural Dynamics, 2010 - Jacksonville, FL, United States
Duration: 1 Feb 20104 Feb 2010

Conference

Conference28th IMAC, A Conference on Structural Dynamics, 2010
CountryUnited States
CityJacksonville, FL
Period1/02/104/02/10

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  • Cite this

    Di Maio, D., Carloni, G., & Ewins, D. J. (2011). Simulation and validation of ODS measurements made using a Continuous SLDV method on a beam excited by a pseudo random signal. In Conference Proceedings of the Society for Experimental Mechanics Series (PART 1 ed., Vol. 3, pp. 1-14)