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Damage delineation in structures using laser vibrometry and remote sensing.
Swanson P; Rettkowski J
Proceedings of the 2004 SEM X International Congress and Exposition on Experimental and Applied Mechanics (Costa Mesa, CA, June 7-10, 2004). Bethel, CT: Society for Experimental Mechanics, 2004 Jun; :1-7
As part of a research program to reduce injuries and fatalities in the U.S. mining workforce, NIOSH is investigating the potential use of noncontact vibration measurements to identify hazardous ground fall conditions. In the present study, the effectiveness of remote vibration sources in exciting resonant responses in damaged structures is examined. Initial experiments were performed on a damaged concrete slab in a controlled environment. Vibration response was measured with a laser Doppler vibrometer using both single-point and two-dimensional array recordings. Excitation sources included direct mechanical impacts to remote portions of the slab and a remotely located industrial demolition hammer. Surficial damage was effectively delineated with both sources through visualization of vibration response in spectral bands selected to discriminate wave propagation from large-scale slab resonance effects.
Mining-industry; Injury-prevention; Accident-prevention; Analytical-instruments; Analytical-methods; Ground-control; Ground-stability; Rock-falls; Rock-bursts; Rock-mechanics; Geology; Vibration-monitors; Underground-mining
Proceedings of the 2004 SEM X International Congress and Exposition on Experimental and Applied Mechanics (Costa Mesa, CA, June 7-10, 2004)
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Content source: National Institute for Occupational Safety and Health Education and Information Division