Acceleration integration method based on frequency spectral energy morphological fitting

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (13) : 7-12.

CHEN Taicong, ZHANG Qi

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Abstract

Here, aiming at the integration problem of noisy acceleration signals, a new frequency domain integration method based on frequency spectral energy morphological fitting was proposed. It was called the effective frequency band method. Assuming that the frequency spectral curve within a range near peak value main frequency satisfies Gaussian distribution, according to cumulative energy changes of a noisy acceleration signal within this range, the corresponding parameters of Gaussian distribution were fitted to determine the distribution range (the effective frequency band) of the main frequency effective information using the 3principle. Then the corresponding velocity and displacement signals were achieved through the frequency domain integration and the inverse Fourier transformation within the effective frequency band. Finally, through numerical simulation examples, the integration effect of the effective frequency band method was inspected under multi-frequency harmonic excitation and random excitation, respectively. The results were compared with those using the traditional frequency domain integration method. It was shown that compared to the traditional frequency domain integration method, the effective frequency band one can be used to realize integration frequency band’s automatic determination, obtain higher integration accuracy under harmonic excitation and stable and good integration accuracy under random excitation, and have a stronger anti-noise ability.

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acceleration integration / frequency domain integration / morphological fitting / effective frequency band

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CHEN Taicong, ZHANG Qi. Acceleration integration method based on frequency spectral energy morphological fitting[J]. Journal of Vibration and Shock, 2019, 38(13): 7-12

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