Generating Frequency Response Functions of A Structure from Time Domain Response Signals

A new method using response time signals and a known reference frequency response function to generate all other FRFs, without the need to measure the excitation force, is presented. This method would be very valuable for cases in which it may be impossible to measure excitation forces. The method is applied to the case of a cantilever beam using simulated vibration of a finite element model of the structure. This method can tackle any forms of excitation, including random vibration, however it requires the reference FRF to be reliable.