HYPER GRAPH

There will be a change in amplitude b/w the time domain and the FFT signal.

This is because, a simple sine curve in time domain is represented as
 Y = A sin (wt), 
 where,
 A > Amplitude,
 T > Time Period of oscillations
 w > 2* PI / T 
 and f = 1/T
 So, when converting the above curve to frequency domain the equation becomes :
 Y = A sin (2*PI*F) T
 This equation is true for a single frequency in which case the amplitude will remain same when you convert from time to frequency.
 But, when you have a complex response curve with multiple frequencies at different time period, the equation will be similar to the one below :
 Y = A1 Sin (w1 t1) + A2 Sin ( w2 t2 ) + A3 Sin (w3 t3) + ....+... 
 In the above equation, since the Amplitude is distributed over different frequencies and hence the amplitude of the resulting curve in the frequency domain changes.
 To cross check this you can do an inverse FFT (IFFT) on the resulted FFT curve to get the original curve.

 I hope this clarifies your query,
 

Thanks for your Reply,,

Sir,

 Actually my problem is,  for my project we did experiment and we got time data csv file, and from experiment they gave FFT Coversion data (image) also , Just i need to import that csv to our Hypergraph and then i need to Convert Time data to Frequency domain in Hypergraph as per above attachment,

My problems.

1. In experiment they got 3m/s2 amplitude for same frequency but for the same data in hypergraph i am getting 2e5 m/s2 but frequency is same for all ,only changes in amplitude,

Hi Pradeep,

Can you check if there are any modelling issues and also check the unit system consistency. 

Hi,

 I got this excel data directly from experimental software (DEWE soft) , just i imported that excel data and converted there time data in to frequency domain, but from dewesoft FFT results, and Hypergrapgh FFT is not matching?