Paper No. 107
The Operating Deflection Shape (ODS) technique that was derived from Experimental Modal Analysis has served well to assist users in quantifying vibration amplitudes, determining vibration mode shapes, looseness between components, the most effective location and direction to add stiffness, and identifying cracks in beams and foundations. A new technique involving amplified video has now become accepted that promises to do much the same with considerably less effort. However, each technique has its own range of applicability.
Examples from the field using both techniques are provided to help users evaluate the relative strengths and weaknesses of the techniques.