Publications

Extending the frequency band for fixed base modal analysis on a vibration slip table

Mayes, Randy L.; Rohe, Daniel P.; Blecke, Jill B.

In previous work, a modal test of a large beam like structure on a vibration slip table was analytically constrained to fixed base providing estimates of the first three bending modes active in the direction of slip table motion. This work extends the frequency band of the method to extract the first ten fixed base modes of the test article. All ten fixed base modal frequencies are within two percent of the truth test fixed base modes. When compared to the truth test, the estimated damping of the lower modes has large error, but at higher frequencies the estimated damping converges on the truth value. © The Society for Experimental Mechanics, Inc. 2014.