LONGITUDINAL STIFFNESS OF MAIN THRUST BEARING FOUNDATIONS

The difficulty of establishing an accurate spring-mass system with which longitudinal vibration characteristics of a ship may be estimated is generally complicated by the need to accurately calculate or estimate the required masses and stiffnesses. The stiffness of the thrust-bearing foundation is no exception; the wide variation in foundation arrangements and the continuity of the thrust bearing and machinery foundations with the ships' innerbottom combine to make this perhaps the most difficult stiffness to calculate. Thus, it is the intent of the following discussion and example to help provide some guidance in making the proper assumptions and calculations required to calculate the stiffness of the thrust-bearing foundation. It should be noted that this stiffness does not deal with the thrust bearing and its housing, but only with the foundation to the point where it bolts to the thrust-bearing housing.

• Supplemental Notes:
  • Prepared by Panel M-20 (Machinery Vibrations) of Ships' Machinery Committee.
• Corporate Authors:

  Society of Naval Architects and Marine Engineers

  601 Pavonia Avenue
  Jersey City, NJ  United States  07306-2907
• Publication Date: 1972-9

Media Info

• Features: References;
• Pagination: 18 p.

Subject/Index Terms

• TRT Terms: Bridge bearings; Deflection; Foundations; Shear stress; Stiffness; Structural plates; Vibration
• Old TRIS Terms: Bearing foundation stiffness; Foundations (Structures); Plate deflections; Shear stiffness
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00041861
• Record Type: Publication
• Source Agency: Society of Naval Architects and Marine Engineers
• Report/Paper Numbers: R-15 Tech, Res
• Files: TRIS
• Created Date: Apr 23 1973 12:00AM