New Techniques in Experimental Structural Dynamics Using a Scanning Laser Vibrometer

reportActive / Technical Report | Accession Number: ADA358509 | Open PDF

Abstract:

This research is to develop new techniques in experimental structural dynamics that use a Laser Doppler Vibrometer LDV to measure structural vibration. This report discusses use of a fixed laser vibrometer for vibration control experiments and for vibration testing. The laser vibrometer measures velocity directly with a small time and phase delay. Thus use of the laser as a sensor can improve performance of a control system for vibration suppression. Furthermore, the laser can be moved over the surface of the structure to measure the vibration of many points. Experiments are being performed using the laser to measure vibration, and piezoceramic patch actuators to suppress vibration. Laser reflection is being investigated as a new way to study the vibration response of structures. This technique is a very simple way to study vibration and control of structures by mapping the operational deflections onto simple line patterns. The laser is also being used to measure vibration through the glass door of a vacuum oven. The project is to study the effect of high temperatures on piezoceramic materials, structural adhesives, and structural damping treatments. The laser can measure vibration on high temperature surfaces where other sensors would fail.

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