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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 · PDF fileDigital Filter vs FFT Techniques for Damping Measurements ... by integrating the product Of mass density and squared ... When

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 · PDF fileDigital Filter vs FFT Techniques for Damping Measurements ... by integrating the product Of mass density and squared ... When

Page 3: Digital Filter vs FFT Techniques for Damping · PDF fileDigital Filter vs FFT Techniques for Damping Measurements ... by integrating the product Of mass density and squared ... When

Page 4: Digital Filter vs FFT Techniques for Damping · PDF fileDigital Filter vs FFT Techniques for Damping Measurements ... by integrating the product Of mass density and squared ... When

Page 5: Digital Filter vs FFT Techniques for Damping · PDF fileDigital Filter vs FFT Techniques for Damping Measurements ... by integrating the product Of mass density and squared ... When

Page 6: Digital Filter vs FFT Techniques for Damping · PDF fileDigital Filter vs FFT Techniques for Damping Measurements ... by integrating the product Of mass density and squared ... When

Page 7: Digital Filter vs FFT Techniques for Damping · PDF fileDigital Filter vs FFT Techniques for Damping Measurements ... by integrating the product Of mass density and squared ... When

Page 8: Digital Filter vs FFT Techniques for Damping · PDF fileDigital Filter vs FFT Techniques for Damping Measurements ... by integrating the product Of mass density and squared ... When

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