FULL-FIELD RANDOM BENDING STRAIN MEASUREMENT OF A PLATE FROM VIBRATION MEASUREMENT

✍ Scribed by Y. Xu; R.N. Miles

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 460 KB
• Volume: 191
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1996.0159

✦ Synopsis

Experimental results of a non-contacting, full-field measurement of random bending strain over the surface of a two-dimensional structure are presented. The method is based on a combination of the measurement of random vibration at discrete points on the structure using a scanning laser vibrometer along with an analysis of the measured data using a surface smoothing technique. The power spectral densities of the random bending strains at all points on the structure are estimated by the numerical differentiation of cross-spectral densities of the vibration measured by two transducers, a fixed reference transducer and a roving (or scanning) transducer. The experimental results are compared with those measured directly using strain gages, which shows very good agreement.