MEASUREMENT OF RELATIVE DISPLACEMENT BETWEEN STERN TUBE BEARING AND SHAFT OF 210,000 DWT TANKER

In order to know the relative displacement between stern tube bearing and propeller shaft, we have carried out measurement of the oil film thickness between them on a 210,000 DWT tanker in her sea trial run and commercial voyage between Japan and the Persian Gulf. The results of the measurement are as follows: 1. Thickness of the oil film in the aftmost section of the bearing is 0.4-0.6 mm at rated revolutions. It reduces to zero in these three cases; that is, when the shaft rotates at a speed lower than 20 rpm, the rudder is turned to the starboard and astern maneuvering is carried out. 2. Thickness of the oil film changes with a certain vibration mode, in which short wave with blade frequency is superimposed on long wave with a frequency 1/3-1/6 times the shaft revolutions. 3. In the rough sea, the shaft often collides with the bearing metal. 4. The propeller shaft is in lateral vibrations with a node on the middle of the stern tube.

• Corporate Authors:

  Japan Association for Technical Information

  4-7-107, Yamazaki-cho, Machida City
  Tokyo 194-01,   Japan 
• Authors:
  • Hyakutake, J
  • Asai, R
  • INOUE, M
  • Fukahori, K
  • Watanabe, Naoto
  • Nonaka, M
• Publication Date: 1973

Media Info

• Pagination: p. 32-40
• Serial:
  • Japan Shipbuilding and Marine Engineering
  • Volume: 7
  • Issue Number: 1
  • Publisher: Japan Association for Technical Information

Subject/Index Terms

• TRT Terms: Bearings; Failure; Lubrication; Shaft bearings; Sterns
• Old TRIS Terms: Bearing lubrication; Stern bearings; Stern tube bearings
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00054387
• Record Type: Publication
• Source Agency: Department of Transportation
• Files: TRIS, USDOT
• Created Date: Jun 18 1974 12:00AM