Modeling and Vibration Characteristics Analysis of Double-rowAngular Contact Ball Turntable Bearings in CT Machine

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Modeling and Vibration Characteristics Analysis of Double-rowAngular Contact Ball Turntable Bearings in CT Machine

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[1]YUAN Feng,LIU Lingzhong,QIN Dongchen,et al.Modeling and Vibration Characteristics Analysis of Double-rowAngular Contact Ball Turntable Bearings in CT Machine[J].Journal of Zhengzhou University (Engineering Science),2024,45(05):23-29.[doi:10.13705/j.issn.1671-6833.2024.05.007]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 45 Number of periods: 2024 05 Page number: 23-29 Column: Public date: 2024-08-08

Title:: Modeling and Vibration Characteristics Analysis of Double-rowAngular Contact Ball Turntable Bearings in CT Machine

Author(s):: YUAN Feng¹; LIU Lingzhong¹; QIN Dongchen¹; CHEN Jiangyi¹; XIE Xinghui²; 1. School of Mechanical and Power Engineering,Zhengzhou University, Zhengzhou 450001,China; 2. Luoyang LYC Bearing Co. ,Ltd. , Luoyang 471039, China

Keywords:: CT machine; mechanical model; vibration model; structural parameter; vibration acceleration

CLC:: TH133. 3TH113. 1

DOI:: 10.13705/j.issn.1671-6833.2024.05.007

Abstract:: In order to improve the running characteristics of the main bearing of the CT machine and ensure the stability of the medical imaging of the CT machine, the double-row angular contact ball turntable bearing developed by Luoyang LYC Bearing Co. , Ltd. was used as the research object for modeling and vibration characteristic analysis.Firstly, based on Hertz′s contact theory, the mechanical model of the bearing with the action of composite load wasestablished. Then the nonlinear dynamic differential equation of the bearing outer ring with 3 degrees of freedomwas established in combination with Newton′s law of motion. Finally the differential equation system was solved bythe fourth-order Runge-Kutta method to obtain the vibration characteristics of the bearing outer ring. On this basis,by analyzing the factors affecting the vibration characteristics of the bearing, such as the radius coefficient of curvature of the groove in the inner and outer rings of the bearing, the number of rolling elements, the clearance, thepreload, etc. , the optimal structural parameters to meet the low vibration of the main bearing of the CT machinewere determined. The results show that the vibration amplitude of the bearing decreases first and then increases withthe increase of the radius coefficient of curvature of the inner and outer ring grooves, which were controlled at0. 515 to 0. 525, respectively. The range of 0. 510 to 0. 525 was more conducive to reducing the vibration of thebearing. With the increase of the number of rolling elements, the vibration amplitude of the bearing also increases,but the change was stable, so the vibration of the bearing can be reduced by reducing the number of rolling elements under the premise of satisfying the design conditions. With the increase of the bearing clearance, the vibration amplitude of the bearing decreases first and then increases sharply, and the vibration reaches the minimum at18 μm. Appropriate axial load can effectively reduce the vibration amplitude of the bearing.

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Last Update: 2024-09-02