The bottom line is that, if abnormally high vibration levels are seen as described, there is a problem. Because the frequency spectrum is derived from the data in. 6 Bode and Nyquist Plot 3. James House, Temple Sowerby, Cumbria, CA10 1RS, United Kingdom. This allows the evaluation of not only the strength and frequency of the vibration, but also the. For historical reasons,* spectroscopists express both energies and. When performing a random vibration analysis, an input spec is generally given in a form such as the log-log plot in the figure or written in the table below. This paper will introduce a selection of applicable. Equivalent lateral force for an earthquake is defined as a set of lateral force which will produce the same peak response as that obtained by dynamic analysis of structures. On Sale Fluke 3561/3502 FC 3YR. Stationary Random Vibrations.