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American Institute of Aeronautics and Astronautics Model Validation of a Bolted Beam Using Spatially Detailed

Summary: American Institute of Aeronautics and Astronautics
Model Validation of a Bolted Beam Using Spatially Detailed
Mode Shapes Measured by Continuous-Scan Laser Doppler
Matthew S. Allen1
David M. Aguilar2
University of Wisconsin-Madison, Madison, Wisconsin, 53706, USA
The mode shapes of a structure are typically more sensitive than its natural frequencies
to local features such as cracks, joints or other anomalies. However, when updating a finite
element model for a complicated structure, the analyst is typically only provided with mode
shape measurements at a very small number of sensors, so they must rely primarily on the
frequencies. With the advent of the Laser Doppler Vibrometer (LDV), one can obtain an
unprecedented level of spatial resolution in an automated manner. However, there still may
be limitations on the information that can be obtained due to variation in the input to the
structure from point to point, the large time required to acquire measurements at each point
sequentially for some structures, and logistical issues. Continuous-scan laser vibrometry has
the potential to overcome some of these limitations. The continuous-scan approach involves
sweeping the laser spot continuously over the structure during a measurement, and then


Source: Allen, Matthew S. - Department of Engineering Physics, University of Wisconsin at Madison


Collections: Engineering