ON THE SUDDENLY OCCURRING HIGH AMPLITUDE LOW FREQUENCY VIBRATION PROBLEM OF A MARINE STEAM TURBINE

During the light load, high speed shop test of a marine steam turbine, it was observed that the rear part of the high pressure cylinder suddenly suffered high amplitude, low frequency vibration and at the same moment the noise level increased. From the fact that the vibration frequency of 40Hz was less than one half the rotating speed, and that the vibration amplitude dit not vary with rpm, it was concluded that the vibration was self-excited, due to the wobbling motion of the rotor shaft journal inside the bearing and the wobbling motion was excited unbalanced by single-side impelling steam on a large L/D cylindrical journal. After the geometry of the journal bearing was altered, L/D from 0.6933 to 0.5, with the specific pressure increased from 0.57 to 0.0836 MPa, the vibration disappeared.

• Supplemental Notes:
  • Ship Engng, n 4, 1994, p 36 [5 p, 5 tab, 2 fig]
• Authors:
  • WU, A
• Publication Date: 1994

Language

• Chinese

Subject/Index Terms

• TRT Terms: Steam turbines; Vibration
• Subject Areas: Marine Transportation;

Filing Info

• Accession Number: 00716175
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Feb 28 1996 12:00AM