![PSD Spectrum
Acceleration time history
)(tA
Fourier transform of
dtetAfA ftj 2
)()(
Power Spectral Density
dffAPSD 2
)(
Code: psd[i] =
Math.sqrt(2.0*accFamp[i]*accFamp[i]*df*0.0001)/9.8*1000000.;//micro G/sqrt(Hz)
In terms of dB
2
2
10
sec/1
))
)(
((log10
mAwhere
df
A
fA
PSD
ref
ref
dB
PSD_rms = Root-Mean-Square(PSD)*sqrt(1.6*(f2-f1)) for frequency range (f1~f2)
PSD_rms = Root-Mean-Square(PSD)*sqrt(f2-f1) for frequency range (f1~f2)](https://image.slidesharecdn.com/powerspectraldensity-200309054053/85/Power-spectral-density-1-320.jpg)
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Power spectral density
- 1. PSD Spectrum Acceleration time history )(tA Fourier transform of dtetAfA ftj 2 )()( Power Spectral Density dffAPSD 2 )( Code: psd[i] = Math.sqrt(2.0*accFamp[i]*accFamp[i]*df*0.0001)/9.8*1000000.;//micro G/sqrt(Hz) In terms of dB 2 2 10 sec/1 )) )( ((log10 mAwhere df A fA PSD ref ref dB PSD_rms = Root-Mean-Square(PSD)*sqrt(1.6*(f2-f1)) for frequency range (f1~f2) PSD_rms = Root-Mean-Square(PSD)*sqrt(f2-f1) for frequency range (f1~f2)