The Art of Practical and Precise Strain Based ... - Webprofile.info
The Art of Practical and Precise Strain Based ... - Webprofile.info
The Art of Practical and Precise Strain Based ... - Webprofile.info
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<strong>Strain</strong>-<strong>Based</strong> Measurement Introduction:FIGURE 1-23. <strong>The</strong> Net Accelerometer Output:mV+10 mV-10 mVAccelerometer Output Component at 100HzPeak Magnitude = 1mV/g X 10 g = ± 10 mVTimemV+100 mVAccelerometer Output Component at 1,000HzPeak Magnitude = 1mV/g X 1g X 100 = ± 100mV0 mVTime-100 mV+110 mVNet Accelerometer Output+100 mV+90 mV0 mVTime- 90 mV-100 mV-110 mV<strong>The</strong> Fast Fourier Transform algorithm (FFT) is a method by which the number<strong>of</strong> computations required to compute the Fourier series is dramatically reducedfrom N 2 calculations to Nlog 2 N calculations, allowing high-speed computersto rapidly compute the Fourier Spectrum <strong>and</strong> plot it as the power spectral density.<strong>The</strong> power spectral density is the plot <strong>of</strong> the relative magnitudes <strong>of</strong> each <strong>of</strong>the Fourier components as a function <strong>of</strong> frequency.CHAPTER 1-44 <strong>The</strong> <strong>Art</strong> <strong>of</strong> <strong>Practical</strong> <strong>and</strong> <strong>Precise</strong> <strong>Strain</strong> <strong>Based</strong> Measurement 2nd Edition © 1999