The analysis of a system with respect to time is known as time domain analysis and with respect to frequency is frequency domain analysis. we usually change our systems from time to frequency by using (fourier, laplace ) to make it easy to understand the response of the system because time domain is more complex for higher orders.
I have a problem, I have a signal in time domain, actually, acceleration was calculated in time domain and the acceleration changes between [-4,4] m/s2. Then I did an FFT on the signal and converted to frequency domain; but the amplitude of acceleration in frequency domain is between [10e-4,1]. Why this difference? acceleration is normalized during the FFT transform or not?
What does FFT transform affect on the acceleration unit? is it m/s2 in frequency domain?
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