Multicrack Localization in Rotors Based on Proper Orthogonal Decomposition Using Fractal Dimension and Gapped Smoothing Method

Lu, Zhiwen, Dong, Dawei, Cao, Shancheng, Ouyang, Huajiang ORCID: 0000-0003-0312-0326 and Hua, Chunrong (2016) Multicrack Localization in Rotors Based on Proper Orthogonal Decomposition Using Fractal Dimension and Gapped Smoothing Method. SHOCK AND VIBRATION, 2016. pp. 1-17.

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Official URL: http://dx.doi.org/10.1155/2016/2375859

Abstract

<jats:p>Multicrack localization in operating rotor systems is still a challenge today. Focusing on this challenge, a new approach based on proper orthogonal decomposition (POD) is proposed for multicrack localization in rotors. A two-disc rotor-bearing system with breathing cracks is established by the finite element method and simulated sensors are distributed along the rotor to obtain the steady-state transverse responses required by POD. Based on the discontinuities introduced in the proper orthogonal modes (POMs) at the locations of cracks, the characteristic POM (CPOM), which is sensitive to crack locations and robust to noise, is selected for cracks localization. Instead of using the CPOM directly, due to its difficulty to localize incipient cracks, damage indexes using fractal dimension (FD) and gapped smoothing method (GSM) are adopted, in order to extract the locations more efficiently. The method proposed in this work is validated to be effective for multicrack localization in rotors by numerical experiments on rotors in different crack configuration cases considering the effects of noise. In addition, the feasibility of using fewer sensors is also investigated.</jats:p>

Item Type:	Article
Depositing User:	Symplectic Admin
Date Deposited:	14 Nov 2017 07:40
Last Modified:	19 Jan 2023 06:50
DOI:	10.1155/2016/2375859
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3012101