Response of a Column in Random Vibration Tests

by Gene K. Baxter, Sr. Mech. Engr.; Electronics Systems Div., General Electric Co., Syracuse, N.Y.,
Ross M. Evan-Iwanowski, Prof. of Mech. and Aerospace Engrg.; Syracuse Univ., Syracuse, N.Y.,

Serial Information: Journal of the Structural Division, 1975, Vol. 101, Issue 9, Pg. 1749-1761

Document Type: Journal Paper


Laboratory experiments were conducted to observe and measure the response amplitude and frequency of a simply supported column. The column was excited by axial forces generated from sinusoidal and random (bandwidths of 3 Hz, l0 Hz, 30 Hz, and l00 Hz) signals. The column will vibrate near its natural frequency if the excitation contains a sufficiently high level power spectral density within the parametric resonance zone of the column. The variance of the response amplitude decreases with increasing bandwidth of excitation. A zero amplitude of response is found during a considerable portion of the excitation time; this indicates there is a discrete component in the probability distribution at zero amplitude.

Subject Headings: Excitation (physics) | Columns | Vibration | Power spectral density | Axial forces | Natural frequency | Parameters (statistics) | Resonance

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