Comparison of Methods Used for Shock and Fourier Spectra Computations
NAVAL ORDNANCE LAB WHITE OAK United States
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Analog and digital techniques used in the computation of the shock and Fourier spectra are presented and compared on the bases of speed, accuracy and ease of usage. Analog computers with active and passive elements are considered, and it is concluded that active RC networks make accurate and simple-to-use computers for the analog determination of spectra. The digital techniques studied included the impulse-invariant Fast Fourier transform, z-transform, and the OHara method which uses a parabolic interpolation formula.