Bode Plot

A plot of the frequency response function that includes log magnitude versus frequency plus phase versus frequency. For a single-degree of freedom, the magnitude is a maximum at the natural frequency and the phase shift is 90.

In most vibration analysis work the phase spectrum is not important and is either ignored or not recorded. In two-channel vibration measurements, such as transfer functions and frequency response measurements used for modal analysis, phase is of vital importance.

The term is named after a man named Bode (pronounced Bo-day), who worked at the Bell Telephone Labs.

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Subjects: Noise & Vibration