Industrial machines such as gas and steam turbines require high efficiency and reliability. Direct lubricated bearings have been developed and installed to reduce mechanical losses. In recent years, it has been reported in the literature that subsynchronous vibration can occur to rotor shafts with direct lubricated tilting pad journal bearings under reduced oil flow rate conditions. In this study, a test rig with a 200 mm diameter and 3.5 meter long rotor supported by a direct lubricated tilting two pad journal bearing was constructed. The primary critical speed is 2100rpm and rotational speed is 3600rpm. The oil-starved area, the non-oil film layer region at the leading edge of the bearing pads, was measured by observing oil film pressure in the bearing clearance with pressure transducers on the rotor surface. A sine sweep excitation test was carried out by using an inertial shaker installed on the bearing housing and the damping ratio of the rotor system was measured. Measured data showed that a larger starved area at the leading edge of the bearing pads due to reduced oil feeding results in a smaller damping ratio, and an increase in the natural frequency of the rotor. Experimental results of two types of oil feeding nozzles were compared with respect to the correlation between starved area and damping ratio of the rotor system, and a relationship between oil flow rate and starved area was discussed. A method for modeling bearing coefficients under starved lubrication has been proposed based on thermo-hydrodynamic lubrication (THL) analysis. A numerical analysis of a finite element-transfer matrix model of the test rotor with the bearing coefficients calculated by the proposed method is carried out, and it is found that the analytical results are in broad agreement with the experimental results.
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ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition
June 11–15, 2018
Oslo, Norway
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5113-5
PROCEEDINGS PAPER
Study on Subsynchronous Vibration With Tilting Pad Journal Bearing Under Starved Lubrication
Rimpei Kawashita,
Rimpei Kawashita
Mitsubishi Heavy Industries, Takasago, Japan
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Tadasuke Nishioka,
Tadasuke Nishioka
Mitsubishi Heavy Industries, Takasago, Japan
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Shimpei Yokoyama,
Shimpei Yokoyama
Mitsubishi Heavy Industries, Takasago, Japan
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Makoto Iwasaki,
Makoto Iwasaki
Mitsubishi Heavy Industries, Takasago, Japan
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Shuichi Isayama,
Shuichi Isayama
Mitsubishi Heavy Industries, Takasago, Japan
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Yuichiro Waki
Yuichiro Waki
Mitsubishi Hitachi Power Systems, Ltd., Takasago, Japan
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Rimpei Kawashita
Mitsubishi Heavy Industries, Takasago, Japan
Tadasuke Nishioka
Mitsubishi Heavy Industries, Takasago, Japan
Shimpei Yokoyama
Mitsubishi Heavy Industries, Takasago, Japan
Makoto Iwasaki
Mitsubishi Heavy Industries, Takasago, Japan
Shuichi Isayama
Mitsubishi Heavy Industries, Takasago, Japan
Yuichiro Waki
Mitsubishi Hitachi Power Systems, Ltd., Takasago, Japan
Paper No:
GT2018-75607, V07AT33A014; 10 pages
Published Online:
August 30, 2018
Citation
Kawashita, R, Nishioka, T, Yokoyama, S, Iwasaki, M, Isayama, S, & Waki, Y. "Study on Subsynchronous Vibration With Tilting Pad Journal Bearing Under Starved Lubrication." Proceedings of the ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. Volume 7A: Structures and Dynamics. Oslo, Norway. June 11–15, 2018. V07AT33A014. ASME. https://doi.org/10.1115/GT2018-75607
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