Experimental verification of the roller bearing energy model for aircraft engines supporting nodes modelling Part 2. Studying the rings bending impact on the full-load characteristic in case of a bearing unfixed in the bearing race

Dynamics, strength of machines, instruments and equipment


Аuthors

Sorokin F. D.1*, Zhang H. 1**, Popov V. V.1***, Ivannikov V. V.2****

1. Bauman Moscow State Technical University, MSTU, 5, bldg. 1, 2-nd Baumanskaya str., Moscow, 105005, Russia
2. Scientific and technical centre of rotor dynamic «Alfa-Tranzit», 1, Leningradskaya str., Khimky, Moscow region, 141400, Russia

*e-mail: sorokinfd@bmstu.ru
**e-mail: zhang274234111@yandex.ru
***e-mail: vvpopov@bmstu.ru
****e-mail: vvivannikov@alfatran.com

Abstract

Bearings with flexible rings analysis is presented in a vast number of technical papers [3-11]. One of the first attempts to perform analysis of the bearing with account for its structural deformations was made by Jones and Harris [3]. They incorporated the outer ring flexibility into the model, although for a very particular case such as the support of an idler gear in a planetary transmission. Later Filetti and Rumbarger [4], developing a general method for predicting the impact of sthe tructural support upon bearing performance, treated the outer ring as a set of beam elements and used 1D linear springs for the rollers in contact. This model proved to have good correlation with experimental data. However, a priori knowledge on the attachment points of the outer ring significantly limits the approach applicability. Moreover, as with the of Jones and Harris formulation [3], only one of the bearing rings is deformable in the Filetti and Rumbarger model [4]. The recent model of Cavallaro et al. [5] considers deformations of both bearing rings. In contrast to the previous formulations, the problem of the rings deformations determination was formulated in terms of forces. The model considered also the centrifugal expansion of the rings, the cage rotation and the lubricant presence. Balykin et al. [6] has also recently studied the effect of the bearing races compliance, although limiting the discussion to some specific cases of external loading.

To verify the energy model of the roller bearing, a full-scale experiment was performed with the universal Zwick/Roell Z100 test machine. The roller bearing of 12309KM type was being loaded by the local compressive load acting on the outer ring. The bearing outer ring deformation was being measured by the strain gage. The experimental data comparison with the numerical results obtained by FEM and the results obtained from the previously developed energy model also confirmed the impact of ring compliance on the elastic characteristic of the bearing. The study revealed that in the absence of structural elements that exclude the rings bending (shafts, clips), the energy model of the roller bearing should be supplemented by a technique for accounting for the rings deformation.

Keywords:

the roller-bearing energy model, elastic characteristics, testing equipment, rings deformation

References

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