Frequency Response Function

The output to input relationship of a structure. Mathematically, it is the Fourier transform of the output divided by the Fourier transform of the input. It is also the transfer function measured along the j axis in the s-plane.

Co-Incident

Another name for the real part of the frequency response function.

Dynamic Stiffness

The frequency response function of force/displacement.

Effective Mass

The frequency response function of force/acceleration.

Imaginary Part

A plot of the imaginary part of the frequency response function versus frequency. For a single-degree-of-freedom system, the magnitude is a maximum or minimum at the damped natural frequency.

Real Part

A plot of the real part of the frequency response function versus frequency. For a single degree of freedom, the magnitude is zero at the damped natural frequency.


See also: Effective Mass, Frequency Response, Frequency Response Matrix, Impulse Response, Modal Analysis.

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Subjects: Noise & Vibration