The Units and Physical Meaning of Fourier Amplitude

02-Analytical capabilities
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WangZhen
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Joined: 11 Sep 2017, 02:42

The Units and Physical Meaning of Fourier Amplitude

Post by WangZhen »

The maximum value of the Fourier Spectra Amplitude is 0.45 when the unit of acceleration time history is g. However, the The maximum of the Fourier Spectra Amplitude remains the same value when I changed the unit from g to gal. So I wonder what is the unit and physical meaning of the Fourier Spectra Amplitude?
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WangZhen
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seismosoft
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Re: The Units and Physical Meaning of Fourier Amplitude

Post by seismosoft »

The acceleration units play a role in the program with respect to the displacement and the velocity units (e.g. when integrating to derive the displacement & velocity time-histories. However, with quantities of acceleration, the results are expected to be the same.
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WangZhen
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Joined: 11 Sep 2017, 02:42

Re: The Units and Physical Meaning of Fourier Amplitude

Post by WangZhen »

Thanks for your reply.
So does it mean that if the numbers of the acceleration time history remains the same, the Fourier Amplitude will not change?
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Wang Zhen
2017.09.12
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seismosoft
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Re: The Units and Physical Meaning of Fourier Amplitude

Post by seismosoft »

Ye, the Fourier Amplitude will not change.
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