Vibration analysis of a dual-rotor-bearing-double casing system with pedestal looseness and multi-stage turbine blade-casing rub

Yang, Yang, Ouyang, Huajiang ORCID: 0000-0003-0312-0326, Yang, Yiren, Cao, Dengqing and Wang, Kai ORCID: 0000-0002-6370-1635 (2020) Vibration analysis of a dual-rotor-bearing-double casing system with pedestal looseness and multi-stage turbine blade-casing rub. MECHANICAL SYSTEMS AND SIGNAL PROCESSING, 143. p. 106845.

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Official URL: http://dx.doi.org/10.1016/j.ymssp.2020.106845

Abstract

Pedestal looseness and rotor-stator rub are two common faults in rotating machines. To increase the thrust-weight ratio and enhance fuel efficiency of aero engines, the structural design of a dual-rotor system has to address these two kinds of common faults. The aim of this paper is to gain insight into the vibration behaviours of a dual-rotor system with pedestal looseness and rotor-stator rub. Firstly, a dual-rotor-bearing-double casing system is modelled. After that, considering the effects of two disc imbalances, and pedestal looseness which exists in high pressure rotor, the rub-impact fault between the multi-stage turbine blades and the multi-layer casings is further introduced to the system. In combination with the distribution of soft and hard coatings, the impact stiffness of the rub-impact model is adjusted accordingly. Then an experimental study is performed on a dual-rotor test rig for verifying the validity of the theoretical model and revealing the dynamic responses at different rotor speed ratio. Finally, taking the stiffness of loosened pedestals, disc eccentricities, speed ratio, and initial gap as the key parameters, the potential effects of pedestal looseness and rub-impact on the dynamic characteristics of the dual-rotor system are investigated in detail.

Item Type:	Article
Uncontrolled Keywords:	Dual-rotor system, Pedestal looseness, Rub-impact, Coating, Dynamic characteristics
Depositing User:	Symplectic Admin
Date Deposited:	15 Apr 2020 09:54
Last Modified:	18 Jan 2023 23:54
DOI:	10.1016/j.ymssp.2020.106845
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3083303