본문 바로 가기

로고

국내 최대 기계 및 로봇 연구정보
통합검색 화살표
  • 트랙백
  • 우수 논문

    뷰페이지 제목 게시판 내용

    Numerical Modeling and Analysis of Flexure-Pivot Tilting-Pad Bearing  
    Suh, Junho(부산대학교 기계공학부)
    United States | Journal of Tribology
    2017-09 | 바로가기
    Bearing_design, Journalbearings
    Cited by

    ■  View full text

    Journal of Tribology

    Published: September 2017

    https://doi.org/10.1115/1.4036275 

     

     

    ■  Researchers

    Junho Suh

    School of Mechanical Engineering, Pusan National University

    Alan Palazzolo

    Department of Mechanical Engineering, Texas A&M University

    Yeon-Sun Choi

    Department of Mechanical Engineering, Sungkyunkwan University

     

     

    ■  Abstract

    This paper presents a new approach for modeling flexure-pivot journal bearings (FPJB) employing a three-dimensional (3D) elasto-hydro-dynamic (EHD) lubrication model. The finite element (FE) method is adopted for an analysis of the (1) pad-pivot dynamic behavior and the (2) fluid force. The isoviscosity Reynolds equation is utilized to calculate the fluid force acting on a flexure-pivot pad bearing and spinning journal. Computational efficiency is achieved utilizing modal coordinate transformation for the flexible pad-pivot dynamic analysis. Fluid film thickness plays a critical role in the solution of Reynolds equation and is evaluated on a node-by-node basis accounting for the pad and web deflections. The increased fidelity of the novel modeling approach provides rotating machinery designers with a more effective tool to analyze and predict rotor–bearing dynamic behavior.

     

     

    ■  Conclusion

    This study presented a new modeling method and algorithm for the evaluation of the static and dynamic characteristics of the flexible pad-pivot FPJB, adopting nonlinear transient dynamic analysis. This study can be summarized as follows:

     

    Modal coordinate transformation is included for calculating the flexible pad-pivot dynamic behavior, in order to increase computational efficiency.

     

    Flexible pad-pivot FE model was simulated and compared to the rigid-pad FPJB, fixed-pad bearing and TPJB with varying web thickness.

     

    Static and dynamic characteristics of the FPJB were simulated with varying number of eigenmodes of the flexible pad-pivot FE model. The fifth bending mode except the first tilting mode, was found to have the biggest influence on the FPJB properties.

     

    Both rigid-pad analytical FPJB and flexible pad-pivot FPJB FE models were simulated with fifteen different web thickness (1–15 mm) converging into the fixed-pad bearing static and dynamic properties. The flexible pad-pivot model produced slower convergence rate with increasing web thickness, which means the conventional approach with the rigid-pad FPJB model will have difficulty in accurately predicting static and dynamic bearing performance.

     

     

     

    * 관련 자료 

    [신진연구자 인터뷰] 저널 비대칭 가열과 샤프트 열굽힘에 기인 한 회전체 동역학적 불안정성 문제 (Morton effect)

    전체댓글0

    댓글 입력란
    프로필 이미지
    0/250자

    서브 사이드

    서브 우측상단1