Frequency domain analysis method of nonstationary random vibration based on evolutionary spectral representation

Zhao, Yan, Si, LT and Ouyang, H ORCID: 0000-0003-0312-0326 (2018) Frequency domain analysis method of nonstationary random vibration based on evolutionary spectral representation. ENGINEERING COMPUTATIONS, 35 (2). pp. 1098-1127.

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Abstract

<jats:sec><jats:title content-type="abstract-subheading">Purpose</jats:title><jats:p>A novel frequency domain approach, which combines the pseudo excitation method modified by the authors and multi-domain Fourier transform (PEM-FT), is proposed for analyzing nonstationary random vibration in this paper.</jats:p></jats:sec><jats:sec><jats:title content-type="abstract-subheading">Design/methodology/approach</jats:title><jats:p>For a structure subjected to a nonstationary random excitation, the closed-form solution of evolutionary power spectral density of the response is derived in frequency domain.</jats:p></jats:sec><jats:sec><jats:title content-type="abstract-subheading">Findings</jats:title><jats:p>The deterministic process and random process in an evolutionary spectrum are separated effectively using this method during the analysis of nonstationary random vibration of a linear damped system, only modulation function of the system needs to be estimated, which brings about a large saving in computational time.</jats:p></jats:sec><jats:sec><jats:title content-type="abstract-subheading">Originality/value</jats:title><jats:p>The method is general and highly flexible as it can deal with various damping types and nonstationary random excitations with different modulation functions.</jats:p></jats:sec>

Item Type:	Article
Uncontrolled Keywords:	Nonstationarity, Evolutionary spectrum, Frequency domain method, Pseudo excitation method, Random vibration
Depositing User:	Symplectic Admin
Date Deposited:	18 May 2018 15:18
Last Modified:	19 Jan 2023 06:33
DOI:	10.1108/EC-06-2017-0219
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3021482