Abstract
To analyze the problem of vibration and bifurcation in the rotor system of the aeroengine with the elastic ring squeeze film damper (ERSFD) and elastic supports, the theoretical equation of the dynamic rotor system is developed in this paper, based on the rotor system, elastic ring squeeze film damper (ERSFD), and three elastic supports. The estimated analytical solution of the oil film force is solved using the short bearing approximation theory and the semi-oil film inference theory in the suspension and the inner and outer boss contact. Considering the oil film stiffness and damping of rolling bearings, the rolling bearing force model is established based on the elastohydrodynamic lubrication (EHL) theory. By the average method, the vibration and bifurcation modes are obtained concerning the bearing coefficient and parameters. The range optimization of parameters can be appropriately improved to enhance the dynamic characteristics of the device given different parameters of the hole of oil seepage, the stiffness, the position of elastic supports, and other structural parameters.
Highlights
Based on the squeeze film damper (SFD), Russian scholars proposed an elastic ring squeeze film damper (ERSFD). e basic principle is to leave the appropriate clearance between the outer ring of the rolling bearing and bearing support. e elastic ring and the lubricating oil were added to the clearance. e vibration attenuation effect is mediated by the journal vortex extrusion between the inner and outer rings of the lubricating oil as well as the elastic band. e inner and outer surfaces of the elastic ring are machined with many bosses, which are staggered and uniformly distributed. e inner surface boss is matched with the outer ring of the bearing surface, and the outer surface boss is matched with the inner surface of the bearing surface
Most research based on numerical simulation and experimental analysis of the ERSFD or SFD rotor system focused on the theoretical solution of the dynamical model. e theoretical derivation process of the affecting efficiency of related factors has not been studied, especially the elastic ring, journal, and bearing support during various contacts. e research object in this paper study is the vibration and bifurcation of an aeroengine rotor system with ERSFD when the elastic ring is in the suspension and the inner and outer boss contact between the journal and bearing seat. e ERSFD model was estimated using geometric relationships. e approximate analytical solution of the oil film force was obtained using the short bearing approximation theory and semi-oil film inference theory
E short bearing theory approximates the analytical solution of the inner oil film forces of the suspension and the inner and outer bosses contact
Summary
Based on the squeeze film damper (SFD), Russian scholars proposed an elastic ring squeeze film damper (ERSFD). e basic principle is to leave the appropriate clearance between the outer ring of the rolling bearing and bearing support. e elastic ring and the lubricating oil were added to the clearance. e vibration attenuation effect is mediated by the journal vortex extrusion between the inner and outer rings of the lubricating oil as well as the elastic band. e inner and outer surfaces of the elastic ring are machined with many bosses, which are staggered and uniformly distributed. e inner surface boss is matched with the outer ring of the bearing surface, and the outer surface boss is matched with the inner surface of the bearing surface. Wang et al [8] used a numerical method to improve the fluid-structure coupling calculation model of the ERSFD and built a test bench to test the dynamic characteristic coefficients of the elastic ring and oil film. They proposed that the oil film force of the elastic ring leads to the complex deformation of the elastic ring and affects the contact state of bosses of the elastic ring. E research object in this paper study is the vibration and bifurcation of an aeroengine rotor system with ERSFD when the elastic ring is in the suspension and the inner and outer boss contact between the journal and bearing seat. According to the relationship of geometry [11,12,13] and the transient Reynolds equation of ERSFD, the maximum oil film clearance is measured and analyzed separately. θ1 and θ2 are the included angles from the maximum oil film thickness of the inner and the outer oil films, respectively. e equations for the oil film pressure were derived
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