Performances of a novel pendulum for measuring ship low-middle frequency pseudo-velocity spectrums

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (6) : 1-6.

ZHAO Pengduo1, ZENG Ze-cui 1,2 , ZHANG Lei1,2, YAN Ming2

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Abstract

Aiming at verifying the low-middle frequency pseudo-velocity spectrums measured by piezoeletric accelerater and replacing the conventional low-frequency oscillator and reed, a novel measuring pendulum was proposed. The equation of motion of the measuring pendulum was derived. The Ritz-Galerkin method was used to solve the equation to obtain the modal frequency, and the Duhamel integral method was used to obtain the maximum angle response of the system. To verify the analysis method, the finite element software ANSYS was used to calculate the modal frequency and maximum angle response. The performance of a measuring pendulum prototype was tested on a vibration excitation platform. The results demonstrate that the measuring pendulum can well verify the low-middle frequency pseudo-velocity spectrums measured by piezoeletric accelerater. It has the smaller volume than the low-frequency oscillator and the larger measuring frequency field than the reed.

Key words

pseudo-velocity spectrum / low frequency oscillator / measuring pendulum / Ritz-Galerkin method

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ZHAO Pengduo1, ZENG Ze-cui 1,2,ZHANG Lei1,2, YAN Ming2. Performances of a novel pendulum for measuring ship low-middle frequency pseudo-velocity spectrums[J]. Journal of Vibration and Shock, 2019, 38(6): 1-6

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