AN INVESTIGATION OF SAVITZKY-GOLAY FILTERS FOR THE CALCULATION OF DERIVATIVES FOR PRIMARY SHOCK CALIBRATION

H. Nozato, Th. Bruns, H. Volkers, A. Oota

Abstract

This manuscript reports about an investigation of two kinds of digital filters used for numerical differentiation of the displacement signal in the case of primary shock calibration of accelerometers. One is a 4^th order Butterworth low-pass (4^th BW) filter of infinite impulse response filters, and another is a Savitzky-Golay (SG) filter, which applies local polynomial approximation. The computational comparison was applied to low and high shocks using known analytical excitation functions. On the optimized condition of 4^th BW and S-G filters, each sum of residuals was compared. As the result, the S-G filters showed for low and high shocks a better performance as low-pass filter than the 4^th BW filters. In addition, the appropriate window width for the local polynomial approximation was derived.

Keywords

shock, acceleration, infinite impulse response filter, derivative, Savitzky-Golay filter

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IMEKO-WC-2012-TC22-O9.pdf

DOI

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IMEKO TC

TC22 - Vibration Measurement

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