Abstract
The rub-impact fault of Jeffcott rotor system which is generally made of an elastic shaft with supported by two bearings at ends and a lumped mass at the mid-span of shaft is the main research subject of this paper. The mechanical model and finite element model of a lump mass at the mid-span of shaft is set up. The dynamics of it are studied by nonlinear finite element method under the rub-impact conditions, and by investigating the effects of stiffness of stator and the clearance between rotor-stator. From the study results, use finite element method to study the rotor system failure problem is intuitive and convenient, high accuracy, high reliability, can be widely applied.
Highlights
As the demand of high speed and high efficiency for rotating machinery, the gap between rotor and stator is more and more small, which leads to rub-impact fault happens very often between the rotor and stator
This paper mainly studies rub-impact fault of rotor model that support on both ends and the concentration mass in the middle based on Jeffcott [2]
In order to further study the rub-impact of rotor system, we need to know that system show the dynamic behaviors when parameters changing
Summary
As the demand of high speed and high efficiency for rotating machinery, the gap between rotor and stator is more and more small, which leads to rub-impact fault happens very often between the rotor and stator. On both ends of the rotor with sliding bearing support, O1is the geometric centre of bearing bush, O2 is the geometric centre of rotor, O 3 is the mass centre of the rotor, kc is the stator stiffness, k is the elastic bearing stiffness, c1 is the damping coefficient of rotor in bearing place, c2 is the damping coefficient of rotor in disc place. It assumes the radial displacement of turntable place is x1 , y1 ; the radial displacement of rotor left x2 , y2. Mechatronics and Information Technology where, f x , f y are dimensionless nonlinear oil film force, fx
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