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Digital Filter vs FFT Techniques for Damping Measurements Svend Gade and Henrik Herlufsen, Brüel & Kjær, Nærum, Denmark Several methods for measuring damping are summarized in this article with respect to their advantages and disadvantages. The use of Digital Filters (DF) and the Fast Fourier Transform (FFT) are compared. In general, FFT analysis is best suited for heavily damped structures, while it is advantageous to use DF analysis when dealing with lightly damped structures.

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Page 1: Digital Filter vs FFT Techniques for Damping …sandv.com/downloads/9003gade.pdfDigital Filter vs FFT Techniques for Damping Measurements Svend Gade and Henrik Herlufsen, Brüel &

Digital Filter vs FFT Techniques for Damping Measurements Svend Gade and Henrik Herlufsen, Brüel & Kjær, Nærum, Denmark

Several methods for measuring damping are summarized in this article with respect to their advantages and disadvantages. The use of Digital Filters (DF) and the Fast Fourier Transform (FFT) are compared. In general, FFT analysis is best suited for heavily damped structures, while it is advantageous to use DF analysis when dealing with lightly damped structures.

Page 2: Digital Filter vs FFT Techniques for Damping …sandv.com/downloads/9003gade.pdfDigital Filter vs FFT Techniques for Damping Measurements Svend Gade and Henrik Herlufsen, Brüel &
Page 3: Digital Filter vs FFT Techniques for Damping …sandv.com/downloads/9003gade.pdfDigital Filter vs FFT Techniques for Damping Measurements Svend Gade and Henrik Herlufsen, Brüel &
Page 4: Digital Filter vs FFT Techniques for Damping …sandv.com/downloads/9003gade.pdfDigital Filter vs FFT Techniques for Damping Measurements Svend Gade and Henrik Herlufsen, Brüel &
Page 5: Digital Filter vs FFT Techniques for Damping …sandv.com/downloads/9003gade.pdfDigital Filter vs FFT Techniques for Damping Measurements Svend Gade and Henrik Herlufsen, Brüel &
Page 6: Digital Filter vs FFT Techniques for Damping …sandv.com/downloads/9003gade.pdfDigital Filter vs FFT Techniques for Damping Measurements Svend Gade and Henrik Herlufsen, Brüel &
Page 7: Digital Filter vs FFT Techniques for Damping …sandv.com/downloads/9003gade.pdfDigital Filter vs FFT Techniques for Damping Measurements Svend Gade and Henrik Herlufsen, Brüel &
Page 8: Digital Filter vs FFT Techniques for Damping …sandv.com/downloads/9003gade.pdfDigital Filter vs FFT Techniques for Damping Measurements Svend Gade and Henrik Herlufsen, Brüel &

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