Journal
MACHINES
Volume 9, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/machines9110251
Keywords
dual-rotor system; non-concentricity in the assembly process; finite element model; vibration characteristics
Funding
- National Major Science and Technology Projects of China [2017-IV-0008-0045]
- National Natural Science Foundation of China [11972129, 12172307]
- Opening Project of Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province
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This study investigates the influence of non-concentricity during the assembly process on the vibration characteristics of an aero-engine dual-rotor system using a finite element model. The results show that parallel and front deflection angle non-concentricity significantly affect bending vibration modes of the rotors. Controlling these parameters is crucial to prevent premature appearance of bending modes in the system.
A finite element model of an aero-engine dual-rotor system with intermediate bearing supported by six bearings is set up. Three modes of non-concentricity caused by the assembly process are defined, namely parallel non-concentricity, front deflection angle non-concentricity and rear deflection angle non-concentricity. The influence of the non-concentricity on the vibration characteristics of the dual-rotor system is investigated in detail. The results show that the parallel non-concentricity and the front deflection angle non-concentricity have a significant influence on the bending vibration modals of the high-pressure rotor and the low-pressure rotor, but have little influence on the local vibration modals of the rotors. With the increase in the magnitude of the non-concentricity, the natural frequencies of the bending modals decrease continuously, and the mode shapes of bending modals and that of local modals may be interchanged, leading to the emergence of bending modals in advance. Therefore, the key parameters to be controlled in the assembly process are the parallel non-concentricity and the front deflection angle non-concentricity. In order to prevent the bending modal of the dual-rotor system from appearing in advance, it is necessary to control the parallel non-concentricity within 2 mm and the front deflection angle non-concentricity amount within 0.18 & DEG;.
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