Hi,
I'm doing a Forced Harmonic Analysis in the frequency domain and I'm not understanding the results output:
After applying the dynamic case (FRF) and defining the frequency interval, I would expect the output in terms of amplitude vs frequency (after the FFT), should be something like below:
I'm getting the following results, where I have negative amplitudes. In a standard FFT, amplitude values should start at zero. Is it related to the real and imaginary parts of the FFT?
How shall I interpret the results, so that I can compare the value at a specific frequency with a reference value?
Best Regards,
Tiago Nobre
