When a finite element model of a structure is available, then this model can be used to simulate tests. This provides test engineers with optimal locations and directions to excite the structure, and to position measurement transducers.
The FE model can be reduced and converted into a test model. Chances for successful application of correlation analysis and finite element model updating considerably improve when tests are made based on the results obtained with pretest analysis.
ome questions that can be answered by pretest analysis are:
Find optimal exciter and transducer locations for modal testing
Create a test model from a reduced finite element model and export in a format readable by modal test packages.
Determine the directions normal to the surface of curved surfaces from the finite element model and use this information for transforming modal test results in Cartesian coordinates.
Assess the influence of the accelerometer mass on the model parameters.
How many modes can be expected in a given frequency range.
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