Dynamic response analysis of an overhung rotor with interval uncertainties

Chao Fu, Xingmin Ren, Yongfeng Yang, Weiyang Qin

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Rotor system is an important part in rotating machineries. As a matter of fact, rotors are subject to uncertainties inevitably due to occasions such as assembling errors, material properties dispersion and variable working conditions. In order to obtain more reasonable evaluations of dynamic response of rotor systems, uncertainties are recommended to be taken into consideration. In this paper, the dynamic responses of an elastically supported uncertain overhung rotor are studied in which uncertain parameters are treated as unknown-but-bounded interval variables. The finite element method is used to derive the deterministic analysis model. A non-intrusive interval method based on Chebyshev polynomial approximation is proposed to evaluate the uncertain dynamic response of the rotor system. Comparative study of the interval method, the scanning method and the Monte Carlo simulation is carried out to illustrate the effectiveness and accuracy. Deflection upper bounds and lower bounds of the disc are obtained with respect to rotating speed in several typical uncertain cases. Results show that the uncertainties have significant effects on the dynamic behaviours of the rotor system and multiple source small uncertainties can lead to large fluctuations in the dynamic responses.

LanguageEnglish
Pages2115-2124
Number of pages10
JournalNonlinear Dynamics
Volume89
Issue number3
Early online date22 May 2017
DOIs
Publication statusPublished - 1 Aug 2017
Externally publishedYes

Fingerprint

Dynamic Response
Rotor
Dynamic response
Rotors
Uncertainty
Interval
Interval Methods
Rotating
Chebyshev Approximation
Polynomial approximation
Uncertain Parameters
Chebyshev Polynomials
Polynomial Approximation
Model Analysis
Deflection
Material Properties
Dynamic Behavior
Comparative Study
Scanning
Materials properties

Cite this

Fu, Chao ; Ren, Xingmin ; Yang, Yongfeng ; Qin, Weiyang. / Dynamic response analysis of an overhung rotor with interval uncertainties. In: Nonlinear Dynamics. 2017 ; Vol. 89, No. 3. pp. 2115-2124.
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Dynamic response analysis of an overhung rotor with interval uncertainties. / Fu, Chao; Ren, Xingmin; Yang, Yongfeng; Qin, Weiyang.

In: Nonlinear Dynamics, Vol. 89, No. 3, 01.08.2017, p. 2115-2124.

Research output: Contribution to journalArticle

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