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.
|Title of host publication||Conference Proceedings of the Society for Experimental Mechanics Series|
|Number of pages||14|
|Publication status||Published - 2011|
|Event||28th IMAC, A Conference on Structural Dynamics, 2010 - Jacksonville, FL, United States|
Duration: 1 Feb 2010 → 4 Feb 2010
|Conference||28th IMAC, A Conference on Structural Dynamics, 2010|
|Period||1/02/10 → 4/02/10|