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 contributionAcademicpeer-review

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 publicationStructural Dynamics - Proceedings of the 28th IMAC, A Conference on Structural Dynamics, 2010
Pages1-14
Number of pages14
EditionPART 1
Publication statusPublished - 2011
Externally publishedYes
Event28th Conference on Structural Dynamics, IMAC 2010 - Jacksonville, United States
Duration: 1 Feb 20104 Feb 2010
Conference number: 28

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
NumberPART 1
Volume3
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652

Conference

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

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