A theoretical model for fault diagnosis of localized bearing defects under non-weight-dominant conditions

11th International Conference on Damage Assessment of Structures

物理学;材料科学

Han, Q.K.^1 ; Chu, F.L.^1

State Key Laboratory of Tribology, Tsinghua University, Beijing

100084, China^1

关键词: Degree of freedom;    Envelope analysis;    Fault characteristics;    High frequency HF;    Localized defects;    Theoretical modeling;    Transverse vibrations;    Vibrational response;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/628/1/012083/pdf
DOI  :  10.1088/1742-6596/628/1/012083

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Fault diagnosis of localized bearing defects under non-weight-dominant conditions is studied in this paper. A theoretical model with eight degrees of freedom is established, considering two transverse vibrations of the rotor and bearing raceway and one high-frequency resonant degree of freedom. Both the Hertzian contact between rolling elements and raceways, bearing clearance, unbalance force and self-weight of rotor are taken into account in the model. The localized defects in both inner and outer raceways are modeled as half sinusoidal waves. Then, the theoretical model is solved numerically and the vibrational responses are obtained. Through envelope analysis, the fault characteristic frequencies of inner/outer raceway defects for various conditions, including the weight-dominant condition and non-weight-dominant condition, are presented and compared with each other.