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2020年7月10日 · A Frequency Response Function (or FRF) is: is a frequency based function; used to identify the resonant frequencies, damping and mode shapes of a physical structure; sometimes referred to a “transfer function” between the input and output; expresses the frequency domain relationship between an input (x) and output (y) of a linear, time ...

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2023年10月23日 · The frequency response function (FRF) is the bread and butter of every person involved in system dynamics. The FRF function is simply the ratio of the system’s output response due to an applied excitation. Engineers use FRFs to measure and characterize a structure’s dynamic behavior.

A frequency response function (FRF) is a transfer function, expressed in the frequency-domain. Frequency response functions are complex functions, with real and imaginary components. They may also be represented in terms of magnitude and phase. A frequency response function can be formed from either measured data or analytical functions.

2009年10月19日 · The following article will attempt to explain the basic theory of the frequency response function (FRF). This basic theory will then be used to calculate the frequency response function between two points on a structure using an accelerometer to measure the response and a force gauge hammer to measure the excitation.

frf = modalfrf(x,y,fs,window) estimates a matrix of frequency response functions, frf, from the excitation signals, x, and the response signals, y, all sampled at a rate fs. The output, frf , is an H 1 estimate computed using Welch’s method with window to window the signals.