GRADUATE SEMINAR - "Digital Image Correlation Applied to Structural Dynamics, Structural Health Monitoring, and Wind Energy", by Professor Christopher Niezrecki, Department of Mechanical Engineering, University of Massachusetts Lowell, Lowell, MA

Education - Colloquium - WPI Only

Wednesday, October 24, 2012
2:00 PM-3:00 PM

Higgins Laboratories
HL116

A significant amount of interest exists in performing non-contacting, full-field surface velocity measurement. For many years
traditional non-contacting surface velocity measurements have been made by using scanning Doppler laser vibrometry, shearography,
pulsed laser interferometry, pulsed holography, or an electronic speckle pattern interferometer (ESPI). Three dimensional (3D)
digital image correlation(DIC) and dynamic point tracking methods utilize the alignment of a stereo pair of images to obtain
full-field geometry data, in three dimensions. Information about the change in geometry of an object over time can be found by
comparing a sequence of images and virtual strain gages (or position sensors) can be created over the entire visible surface of
the object of interest. Digital imaging techniques were first developed in the 1980s but the technology has only recently been
exploited in industry and research due to the advances of digital cameras and personal computers. The use of DIC for structural
dynamic measurement and structural health monitoring has only very recently been investigated. Within the presentation, the
advantages and limits of using DIC and dynamic point tracking for dynamic measurement are presented. Several examples of using
DIC for dynamic measurement are presented on several vibrating and rotating structures. The applicability of using these
techniques to monitor helicopters, wind turbines, bridges, and other large structures is presented.

Suggested Audiences: College

E-mail: mdemetri@wpi.edu
Phone: 508-831-5459

Last Modified: September 6, 2012 at 3:00 PM

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