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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2019  >  19(2): 92-100
OUYANG Wu, CHENG Qi-chao, WANG Lei, JIN Yong. Distributed dynamics characteristics of water-lubricated stern bearing under offset load[J]. Journal of Traffic and Transportation Engineering, 2019, 19(2): 92-100. doi: 10.19818/j.cnki.1671-1637.2019.02.009
Citation: OUYANG Wu, CHENG Qi-chao, WANG Lei, JIN Yong. Distributed dynamics characteristics of water-lubricated stern bearing under offset load[J]. Journal of Traffic and Transportation Engineering, 2019, 19(2): 92-100. doi: 10.19818/j.cnki.1671-1637.2019.02.009
shu

Distributed dynamics characteristics of water-lubricated stern bearing under offset load

doi: 10.19818/j.cnki.1671-1637.2019.02.009
  • 1.

    School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, Hubei, China

  • 2.

    National Engineering Research Center for Water Transportation Safety, Wuhan University of Technology, Wuhan 430063, Hubei, China

  • 3.

    Key Laboratory of Marine Power Engineering and Technology of Ministry of Communications, Wuhan University of Technology, Wuhan 430063, Hubei, China

  • 4.

    Chinese Research and Design Center of Ship, Wuhan 430064, Hubei, China

More Information
  • Author Bio:

    OUYANG Wu (1987-), male, associate professor, PhD, ouyangw@whut.edu.cn

  • Received Date: 2018-09-09
  • Publish Date: 2019-04-25
    Abstract
  • In order to reveal the hydrodynamics behavior of water-lubricated stern bearing with a large length-diameter ratio under offset load, a test method of distributed dynamics characteristics parameters was proposed. A large-size water-lubricated stern bearing with a diameter of 324 mm and a length of 1 200 mm was tested on a large-scale propulsion shafting simulation test stand. Three cross sections of the bearing were selected along the axis direction, and two eddy current sensors perpendicular to each other were arranged on each cross section to obtain the axis orbits. At the same time, four cross sections of the shaft were selected along the axis direction and each section installed with a micro pressure sensor, respectively, and the signals of water film pressure distributions of the sections were obtained by the wireless telemetry. The inclined angle of the axis was adjusted by changing the elevation of the adjacent bearing, and the influence rules of rotation speed and elevation on the water film pressure distribution and running state of journal of test bearing were studied. Research result shows that the pressure test value of the section closest to the cantilever end due to the offset load is obviously larger than that of other sections, and the maximum value is about 3.6 MPa. The lubrication state of the bearing is partitioned along the axial direction, and the closer to the cantilever end, the more obvious the elastohydrodynamic lubrication characteristics. Different bearing segments need different speeds to generate hydrodynamic water film. The "water pocket" at the top of pressure curve of the section closest to the cantilever end appears with the increase of the rotating speed, but it is not obvious at 220 r·min-1. The negative pressure phenomenon appears in the pressure distribution of each section. The spatial form of the journal in the bearing hole is relatively complex. The journal severely bends down on both sides of the bearing and arches in the middle, and the deflection angles of different bearing sections are different. The farther away from the cantilever end, the larger the axis orbit area. Compared with the bearing with a single lubrication state and a straight journal, the hydrodynamics model of water-lubricated stern bearing with large length-diameter ratio under offset load should take into account the factors, such as the zoning characteristics of lubrication state, the bending state of the shaft and the negative pressure phenomenon.

     

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