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Dynamic Characteristics of Blade-Disk-Rotor System with Structural Mistuned Features



Chaofeng Li*, 1, Shihua Zhou1, Shuhua Yang2, Xiang Ren1, Bangchun Wen1
1 School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, P.R. China
2 The Research Institute, Shenyang Blower Works Group Co. Ltd, Shenyang 110819, P.R. China


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© 2014 Li et al

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: (https://creativecommons.org/licenses/by/4.0/legalcode). This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, P.R China; Tel: +86-024-83674491; Fax: +86-024-83674491; E-mail: chf.li@mail.neu.edu.cn


Abstract

The finite element method is adopted to establish the dynamical models of blade, bladed disk and blades-diskshaft assemblies. Based on the analysis of mistuned structure and the dynamic characteristics of model in different levels, it gives the vibration mode distribution of different models. The research shows that the characteristics of the bladed disk and shaft have a huge difference, where some modes are caused by the strongly split and coupled vibration. The mistuned effects are likely to cause different coupled vibrations of blades between the blades-disk model and the blades-disk-shaft model. Meanwhile, it shows the frequency separation and concentration, and misses the system mode and the local vibration, which bring some difficulties for designing the blade-rotor system. In this paper, the results may provide a certain reference for blade-rotor system design and diagnosis.

Keywords: blades-rotor, mistuned model, frequency separation, local vibration.