Rotor Dynamic Characteristics Supported by Multi-Pad Bump Foil Gas Bearings
Bump foil gas bearings (BFGBs) play an important role in high-speed turbomachinery. However, most studies on the dynamic characteristics of BFGBs focus on a one-pad structure composed of a bump foil and a top foil. This paper considers the multi-pad foil structure in BFGBs by developing the finite e...
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MDPI AG
2025-03-01
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| Online Access: | https://www.mdpi.com/2075-4442/13/3/127 |
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| author | Lei Zhao Hongyang Hu Changlin Li Jingquan Zhao |
| author_facet | Lei Zhao Hongyang Hu Changlin Li Jingquan Zhao |
| author_sort | Lei Zhao |
| collection | DOAJ |
| description | Bump foil gas bearings (BFGBs) play an important role in high-speed turbomachinery. However, most studies on the dynamic characteristics of BFGBs focus on a one-pad structure composed of a bump foil and a top foil. This paper considers the multi-pad foil structure in BFGBs by developing the finite element model of bump and top foils and introducing nonlinear contact constraints between bearing components. In addition, a transient dynamic model of a rotor and multi-pad bump foil gas bearing (MP-BFGB) system is established through sufficient considerations of coupling effects among rotor, gas film, and foil structures. Nonlinear rotor dynamic responses, including stability and vibration characteristics, are obtained through integrating the transient state variables in the time domain. The results show that the rotor stability can be enhanced by increasing the number of top foil pads, which, however, tends to reduce the bearing load capacity and gas film stiffness. In addition, rotor sub-synchronous vibrations are more prone to appear under greater gas film stiffness. |
| format | Article |
| id | doaj-art-6c8fef55643740ba8b7d17af14cf73f2 |
| institution | OA Journals |
| issn | 2075-4442 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | MDPI AG |
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| series | Lubricants |
| spelling | doaj-art-6c8fef55643740ba8b7d17af14cf73f22025-08-20T02:11:04ZengMDPI AGLubricants2075-44422025-03-0113312710.3390/lubricants13030127Rotor Dynamic Characteristics Supported by Multi-Pad Bump Foil Gas BearingsLei Zhao0Hongyang Hu1Changlin Li2Jingquan Zhao3School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, ChinaAVIC Xinxiang Aviation Industry (Group) Co., Ltd., Xinxiang 453000, ChinaSchool of Mechanical Engineering and Automation, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, ChinaSchool of Aeronautic Science and Engineering, Beihang University, Beijing 100191, ChinaBump foil gas bearings (BFGBs) play an important role in high-speed turbomachinery. However, most studies on the dynamic characteristics of BFGBs focus on a one-pad structure composed of a bump foil and a top foil. This paper considers the multi-pad foil structure in BFGBs by developing the finite element model of bump and top foils and introducing nonlinear contact constraints between bearing components. In addition, a transient dynamic model of a rotor and multi-pad bump foil gas bearing (MP-BFGB) system is established through sufficient considerations of coupling effects among rotor, gas film, and foil structures. Nonlinear rotor dynamic responses, including stability and vibration characteristics, are obtained through integrating the transient state variables in the time domain. The results show that the rotor stability can be enhanced by increasing the number of top foil pads, which, however, tends to reduce the bearing load capacity and gas film stiffness. In addition, rotor sub-synchronous vibrations are more prone to appear under greater gas film stiffness.https://www.mdpi.com/2075-4442/13/3/127multi-pad bump foil bearingrotor dynamic characteristicsfinite element methodnonlinear contact constraints |
| spellingShingle | Lei Zhao Hongyang Hu Changlin Li Jingquan Zhao Rotor Dynamic Characteristics Supported by Multi-Pad Bump Foil Gas Bearings Lubricants multi-pad bump foil bearing rotor dynamic characteristics finite element method nonlinear contact constraints |
| title | Rotor Dynamic Characteristics Supported by Multi-Pad Bump Foil Gas Bearings |
| title_full | Rotor Dynamic Characteristics Supported by Multi-Pad Bump Foil Gas Bearings |
| title_fullStr | Rotor Dynamic Characteristics Supported by Multi-Pad Bump Foil Gas Bearings |
| title_full_unstemmed | Rotor Dynamic Characteristics Supported by Multi-Pad Bump Foil Gas Bearings |
| title_short | Rotor Dynamic Characteristics Supported by Multi-Pad Bump Foil Gas Bearings |
| title_sort | rotor dynamic characteristics supported by multi pad bump foil gas bearings |
| topic | multi-pad bump foil bearing rotor dynamic characteristics finite element method nonlinear contact constraints |
| url | https://www.mdpi.com/2075-4442/13/3/127 |
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